WO2016031911A1

WO2016031911A1 - Control information generating device, receiving device, video signal transmitting system and control program

Info

Publication number: WO2016031911A1
Application number: PCT/JP2015/074221
Authority: WO
Inventors: 鈴木　秀樹; 高橋　幸雄; 明子佐藤; 智夫西垣
Original assignee: シャープ株式会社
Priority date: 2014-08-29
Filing date: 2015-08-27
Publication date: 2016-03-03
Also published as: JP6272523B2; JP2017123684A; JPWO2016031911A1

Abstract

This transmitter (1) includes a color gamut information obtaining unit (17) that obtains color gamut information about the color gamut of video contents transmitted by an MMT, and a control information generating unit (18) that generates an MPT containing the color gamut information.

Description

Control information generating device, receiving device, video signal transmission system, and control program

The present invention relates to video color gamut conversion, and more particularly to a control information generation device that generates information used for video color gamut conversion.

As part of the advancement of broadcasting, video signals that can reproduce a wider color gamut than before have been proposed. Specifically, the ITU-R BT.2020 (hereinafter referred to as BT.2020) established by the International Telecommunications Union is based on the conventional ITU-R BT.709 (hereinafter referred to as BT.709). It has become possible to express a significantly wider color gamut. Then, in 2014, 4K test broadcasting using this standard was started, and it is expected that 4K / 8K broadcasting will be used mainly in the future.

Here, in a video signal having a wide color gamut such as BT.2020, some colors may not be reproduced on an existing television display. For this reason, the display to be displayed needs to convert the received video signal into a reproducible color gamut.

There are two main methods for this process. One is a method (compression) of converting all video signals into a reproducible region by color gamut compression. According to compression, it is possible to reproduce while maintaining the gradation of all colors, but there is a drawback that the color expression deviates from the original signal as a whole. The other is a method (clipping) of compressing only a video signal outside the reproducible color gamut into the reproducible color gamut. According to clipping, a signal within a reproducible color gamut can be accurately expressed, but there is a disadvantage that the gradation of a signal outside the reproducible color gamut is lost, resulting in an unnatural image. As prior art documents regarding such color gamut conversion, for example, the following Patent Documents 1 to 3 can be cited.

Japanese Patent Publication “JP 2006-148607 A (published June 8, 2006)” Japanese Patent Publication “Japanese Unexamined Patent Publication No. 2009-218963 (published on Sep. 24, 2009)” Japanese Patent Publication “Japanese Unexamined Patent Publication No. 2009-038686 (published on Feb. 19, 2009)”

Here, when the playback target is something like a broadcast content that changes every moment, it is necessary to adaptively change the color gamut conversion process according to the content that changes every moment. However, the conventional technology has a problem that the color gamut conversion process cannot be adaptively changed in accordance with the changing contents. For example, even after the playback target is switched, the same color gamut conversion processing as that before switching is applied, and as a result, there is a problem that the color of the playback target changes unnaturally.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a control information generation device and the like that can adaptively convert the color gamut of the video in accordance with the content to be reproduced. It is in.

In order to solve the above-described problem, a control information generation device according to an aspect of the present invention is a control information generation device that generates control information for reproducing content transmitted by MMT. This is a configuration including a color gamut information acquisition unit that acquires color gamut information related to the color gamut of a video, and a control information generation unit that generates an MMT package table including the color gamut information.

In order to solve the above problem, a receiving device according to one aspect of the present invention is a receiving device that receives content transmitted by MMT, and includes color gamut information related to a color gamut of a video of the content. A control information acquisition unit that acquires an MMT package table including the color information and a color gamut conversion unit that converts the color gamut of the video of the content according to the color gamut information.

In order to solve the above problems, a video signal transmission system according to an aspect of the present invention is a video signal transmission system including a transmission device that transmits content using MMT and a reception device that receives the content. The transmitting device transmits an MMT package table including color gamut information indicating a color gamut of the video of the content to the receiving device together with the content as a digital broadcast signal, and the receiving device receives the digital broadcast signal from the digital broadcast signal. The MMT package table is acquired, and the color gamut of the video of the content is converted according to the color gamut information.

According to each aspect of the present invention, it is possible to adaptively convert the color gamut of the video according to the content to be reproduced.

It is a block diagram which shows an example of a principal part structure of the transmitter and receiver which are contained in the video signal transmission system which concerns on Embodiment 1 of this invention. It is a figure which shows an example of MPT including the color gamut information transmitted / received by the said video signal transmission system. It is a figure which shows an example of the color gamut conversion using an outer edge coordinate. It is a figure which shows an example of the color gamut conversion using area ratio information. It is a figure which shows an example of the color gamut conversion using the information which shows the ratio of the area of the area | region which protruded. It is a figure explaining corresponding format information and non-corresponding format information. It is a flowchart which shows an example of the process which acquires the color gamut information performed with the said receiver. It is a flowchart which shows an example of the color gamut conversion process performed with the said receiver. It is a block diagram which shows an example of a principal part structure of the transmitter and receiver which are contained in the video signal transmission system which concerns on Embodiment 4 of this invention. It is a figure which shows an example of PMT containing the color gamut information transmitted / received by the said video signal transmission system. It is a flowchart which shows an example of the process which acquires the color gamut information performed with the said receiver. It is a flowchart which shows an example of the color gamut conversion process performed with the said receiver. It is a block diagram which shows an example of the principal part structure of the transmitter and receiver which are contained in the video signal transmission system which concerns on Embodiment 7 of this invention. (A) is a figure which shows an example of EIT containing color gamut information transmitted / received by the said video signal transmission system, (b) is other than the descriptor containing the color gamut information in EIT shown to (a). It is a figure which shows an example. It is a flowchart which shows an example of the process which acquires the color gamut information performed with the said receiver. It is a flowchart which shows an example of the color gamut conversion process performed with the said receiver. It is a figure which shows an example of the electronic program guide which the said receiver produces | generates with reference to EIT containing color gamut information. It is a block diagram which shows an example of a principal part structure of the transmitter contained in the video signal transmission system which concerns on Embodiment 10 of this invention. It is a block diagram which shows an example of a principal part structure of the receiver contained in the said video signal transmission system. It is a figure which shows the activation example of AIT transmitted with a broadcast signal, and the application according to this AIT. It is a figure which shows the example of a timing specification information and the change of the color gamut according to this timing specification information. It is a flowchart which shows an example of the process which acquires the color gamut information performed with the said receiver. It is a flowchart which shows an example of the color gamut conversion process performed with the said receiver. It is a figure explaining the color gamut conversion using a conversion table. It is a figure which shows an example of the color gamut adjustment screen displayed on a receiver for color gamut adjustment. It is a flowchart which shows an example of the process performed by the said receiver, when accepting the color gamut adjustment by user operation. It is a figure which shows schematic structure of the video signal transmission system which concerns on Embodiment 11 of this invention. It is a block diagram which shows an example of a principal part structure of the receiver and terminal device which are contained in the said video signal transmission system. It is a figure which shows an example of the color gamut adjustment screen displayed on a terminal device for adjustment of a color gamut.

Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS. First, the configuration of the video signal transmission system according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating an example of a main configuration of a transmitter (control information generation device, transmission device) 1 and a receiver (reception device) 2 included in the video signal transmission system 5.

The video signal transmission system 5 is a system that transmits a video signal and the like from the transmitter 1 to the receiver 2. The video signal transmission system 5 is mainly characterized in that the color gamut information indicating the color gamut of the video to be transmitted is transmitted together with the video signal, thereby performing optimum color gamut conversion according to the video. It is possible. In the next-generation 4K / 8K broadcasting, it is considered that signals are transmitted in the MMT (MPEG Media Transport) format. Therefore, in this embodiment, an example in which a video signal is transmitted in the MMT format will be described.

Transmitter 1 transmits content in the form of a video signal or the like. More specifically, the transmitter 1 transmits each packet (MMTP packet: MMT Protocol packet) constituting the content through a broadcast path (broadcast transmission path). One receiver 2 has a function for receiving this content (content distributed via a broadcast route), and also has a function for receiving content distributed via a communication route via a communication network such as the Internet. . And the receiver 2 can reproduce | regenerate combining each content received via these two paths | routes. In the figure, only one receiver 2 is shown, but the transmitter 1 broadcasts content to a plurality of receivers 2.

[Configuration of transmitter]
The transmitter 1 includes an audio encoder 10, a video encoder 11, a multiplexing unit 12, an encryption unit 13, a transmission unit 14, and a control unit 15, as illustrated. The control unit 15 includes an encoding control unit 16, a color gamut information acquisition unit 17, and a control information generation unit 18.

The audio encoder 10 encodes (encodes) the audio (sound) stream of the content transmitted by the transmitter 1 and outputs it to the multiplexing unit 12. Similarly, the video encoder 11 encodes (encodes) a video (video) stream of content transmitted by the transmitter 1 and outputs the encoded video (video) stream to the multiplexing unit 12.

The multiplexing unit 12 multiplexes the audio stream output from the audio encoder 10, the video stream output from the video encoder 11, and the control information output from the control unit 15, and outputs the multiplexed information to the encryption unit 13.

The encryption unit 13 encrypts the multiplexed stream output from the multiplexing unit 12 and outputs the encrypted stream to the transmission unit 14. Then, the transmission unit 14 transmits the encrypted data output from the encryption unit 13 as a packet to the receiver 2 through the broadcast path in the form of a digital broadcast signal.

The control unit 15 controls each unit included in the transmitter 1. Specifically, the encoding control unit 16 included in the control unit 15 controls the audio encoder 10 and the video encoder 11 to perform encoding.

The color gamut information acquisition unit 17 acquires color gamut information that is information related to the color gamut of the content transmitted by the transmitter 1, and outputs the acquired color gamut information to the control information generation unit 18. The method for obtaining the color gamut information is not particularly limited. For example, the color gamut of the content obtained by the shooting is determined from the model of the camera used for shooting, so the color gamut information is obtained from the information of the camera used for shooting. You may get it. Further, when video processing is performed on the content, the color gamut of the content may be specified depending on the equipment used for the video processing. In this case, the color gamut information may be acquired from the information on the equipment used for the video processing. In addition to this, for example, the color gamut information may be acquired by performing video analysis of the content at an arbitrary timing such as the time of editing. Details of the color gamut information will be described later.

The control information generation unit 18 generates control information for reproducing the content transmitted by the transmitter 1. This control information is called MMT-SI in MMT, and includes various information related to content. Here, MPT (MMT Package Package) in which information related to a package of content is described in MMT-SI. The explanation will focus on the generation of.

As described above, in the transmitter 1, the color gamut information acquisition unit 17 executes the process of acquiring the color gamut information (color gamut information acquisition step). Then, the control information generation unit 18 executes a process (control information generation step) for generating control information (MPT) including the color gamut information. Therefore, in the receiver 2 that has received the MPT, it is possible to display the content received together with the MPT with appropriate conversion according to the color gamut information (or without conversion).

Note that, when the content transmitted by the transmitter 1 is switched, the color gamut information acquisition unit 17 acquires the color gamut information of the content after switching, and the control information generation unit 18 generates an MPT including this color gamut information. As described above, by generating an MPT including different color gamut information following the change of the content, it is possible to always reproduce the content by optimal conversion.

[Configuration of receiver]
As shown, the receiver 2 includes a tuner 20, a communication I / F 21, a decoding unit 22, a demultiplexing unit 23, an audio decoder 24, a video decoder 25, a color gamut conversion unit 26, a display control unit 27, a display 28, And a control unit 29. The control unit 29 includes a decoding control unit 30, a demultiplexing control unit 31, and a control information acquisition unit 32.

The tuner 20 receives content and the like transmitted as a digital broadcast signal through the broadcast path and outputs them to the decoding unit 22. On the other hand, the communication I / F 21 receives the content transmitted through the communication path and outputs it to the decoding unit 22.

When the content received via the tuner 20 and the communication I / F 21 is encrypted, the decryption unit 22 decrypts the content and outputs it to the demultiplexing unit 23.

The demultiplexer 23 demultiplexes the data output from the decryptor 22 (encrypted but decrypted). Then, each component (component) of the content obtained by demultiplexing is processed according to the type of the component. Specifically, the demultiplexer 23 outputs the audio component to the audio decoder 24, outputs the video component to the video decoder 25, and outputs the control information to the control information acquisition unit 32.

The audio decoder 24 decodes the audio component output from the demultiplexer 23 and outputs audio data. Similarly, the video decoder 25 decodes the video component output from the demultiplexer 23 and outputs video data.

The color gamut conversion unit 26 determines whether or not color gamut conversion is necessary based on the color gamut information. When conversion is necessary, the method is also determined, and the color gamut of the video data output from the video decoder 25 is converted by the determined method. With this conversion, the color gamut of the video data output from the video decoder 25 falls within the range of the color gamut that can be displayed on the display 28. For example, if it is determined from the color gamut information that the color gamut of the video data to be reproduced is within the reproducible color gamut of the display 28, it is determined not to convert. On the other hand, if it is determined that the color gamut is outside the reproducible color gamut of the display 28, appropriate conversion is performed according to the ratio of the color outside the display 28. Note that the color gamut conversion unit 26 may be provided in the control unit 29.

The display control unit 27 performs control to display the video data on the display 28. The display 28 displays video data according to the control of the display control unit 27. That is, the receiver 2 is a television receiver having a function for receiving and reproducing (displaying) content to be broadcast. The display 28 may be an external device externally attached to the receiver 2.

The control unit 29 controls each unit included in the receiver 2 according to the received control information. Specifically, the decryption control unit 30 controls the decryption unit 22 to decrypt the content. Further, the demultiplexing control unit 31 controls the demultiplexing unit 23 to perform demultiplexing of content. Then, the control information acquisition unit 32 acquires the control information output by the demultiplexing unit 23 demultiplexing. When the control information includes color gamut information, the control information acquisition unit 32 converts the information into the color gamut conversion unit. 26.

[Example of MPT including color gamut information]
Next, an example of MPT including color gamut information will be described with reference to FIG. FIG. 2 is a diagram illustrating an example of MPT including color gamut information. The illustrated MPT includes a descriptor D1 (version) indicating the version of the MPT, a descriptor D2 (MMT_package_id_byte) indicating the package ID of the MMT, and a descriptor D3 (MPT_descriptors_byte) including color gamut information. )It is included.

In the descriptor D3, a predetermined tag descriptor_tag indicating that the descriptor (descriptor) is a descriptor related to gamut information, a descriptor_length indicating the length of the descriptor, and a data body of the gamut information Data () is described. Note that the value of descriptor_tag only needs to be able to specify that the description about color gamut information is included in the descriptor D3. For example, in ARIBARISTD-B60 that defines the standard for digital broadcasting, it indicates other descriptors. A value of “0x80F0” that is not used may be used.

Here, in general, in television broadcasting, videos with different sources are transmitted continuously, and there is a possibility that videos of such different sources have different color gamuts. Therefore, in order to deal with such a case, when the source changes, the control information generation unit 18 updates the gamut information in the MPT and also updates the MPT version information (value of the descriptor D1). To do. In the receiver 2, the control information acquisition unit 32 checks the color gamut information every time the version of the MPT is updated, and if there is an update, transmits the new color gamut information to the color gamut conversion unit 26. As a result, it is possible to express an appropriate color according to the change of the video.

In the MPT of FIG. 2, outer edge coordinates indicating the outer edge in the chromaticity space of the color gamut of the video of the received (reproduced) content are stored as data (). However, the color gamut information described in data () is information related to the color gamut of the received content, and can be used to determine whether or not color gamut conversion is necessary and to determine the mode of conversion when conversion is necessary. However, the present invention is not limited to this example. For example, the color gamut information may include at least one of the following information.
(1) Outer coordinates indicating the outer edge of the color gamut (the color gamut of the video of the received content) on the chromaticity space or chromaticity plane, and (2) the area occupied by the color gamut of the received content on the chromaticity plane; Area ratio information indicating a ratio of a predetermined color gamut to the area on the chromaticity plane as a comparison target with the color gamut (3) A color gamut of received content is a comparison target with the color gamut Information indicating the degree of going out of the predetermined color gamut (4) Corresponding format information (corresponding standard information) indicating the color gamut format (video standard) in which the color gamut including the color gamut of the received content is defined )
(5) Non-compliant format information (non-compliant standard information) indicating a gamut format (video standard) in which a gamut that does not include at least a part of the gamut of the received content is defined
As a specific example, the outer edge coordinates in (1) above are described in a format such as [(x, y, z), (x, y, z), ..., (x, y, z)]. The outermost coordinates of the color gamut represented on the chromaticity space or chromaticity plane may be used. The outer edge coordinates only need to include coordinates of at least three points.

In addition, the “color gamut predetermined as a comparison target” in the above (2) and (3) may be anything as long as the color gamut can be recognized on the receiver 2 side. For example, the above-mentioned “color gamut predetermined as a comparison target” may be a color gamut defined by an existing color gamut format (video standard), or independent of a color gamut of an existing color gamut format. It may be a set color gamut. As an example of the former, the color gamut of BT.2020 is used as the “color gamut predetermined as a comparison target” in (2) above, and BT is used as the “color gamut predetermined as a comparison target” in (3) above. An example using the .709 color gamut is given. Note that the “color gamut predetermined as a comparison target” in (3) above is a color gamut in which the color gamut of the received content may protrude (a color narrower than the maximum color gamut that the received content can take) Area). Also, as an example of the latter, how wide and range the color gamut is for each type of display, such as LCD (Liquid Crystal Display) Level 10 and OLED (Organic Electro-Luminescence Display) Version 4. Examples are specified by version number and numerical level.

The area ratio information of (2) is such that (the area occupied by the color gamut of the received content on the chromaticity plane) / (the area occupied by the color gamut predetermined as a comparison target on the chromaticity plane) The area ratio may be indicated in a form. Also, the color gamut of the received content is the area occupied by the color gamut predetermined as a comparison target on the chromaticity plane, such as 70% of BT.2020 and 50% of xvYCC (extended video YCC). The percentage of the area occupied on the chromaticity plane may be indicated as a percentage.

Further, the information (3) may be information in which information indicating a color gamut predetermined as a comparison target is associated with information indicating the proportion of the color gamut outside the color gamut. For example, when n% of the color gamut of the received content exists outside the color gamut of BT.709, information in a format such as BT.709, n (%) may be used.

Thus, for example, it is possible to recognize that n% of protrusion occurs in the receiver 2 including the display 28 compliant with BT.709. Also, the conversion mode can be changed according to the magnitude of n. For example, when n is 30 to 50%, clipping is applied when the protruding portion is relatively small, and compression is applied when protruding portion is large, such as when n is 80% or more. It becomes possible. Note that n may be calculated by counting the number of pixels on the chromaticity plane. For example, n is calculated by the following equation: (the number of pixels outside the comparison color gamut among the pixels in the content color gamut) / (total number of pixels included in the content color gamut) × 100. Good.

Details of the corresponding format information and non-supported format information (4) and (5) above will be described later with reference to FIG.

[Example of color gamut conversion using outer edge coordinates]
Next, an example of color gamut conversion using outer edge coordinates (see (1) above) as color gamut information will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of color gamut conversion using outer edge coordinates. In the example of the figure, the color gamut format of the received content is BT.2020. As color gamut information, outer edge coordinates [(x1, y1), (x2, y2), (x3, y3)] are used.

As shown in FIG. 5A, the color gamut R2 that can be displayed on the display 28 is narrower than the color gamut R3 of BT.2020, and among the color gamut R1 of the video of the received content, the area R4 is the color gamut R2. It protrudes outside. That is, the color gamut R1 is a wide color gamut that exceeds the capabilities of the display 28.

Since the outer edge of the color gamut R2 is determined in advance according to the display performance of the display 28, the color gamut conversion unit 26 may acquire information (for example, a mathematical expression) indicating the outer edge of the color gamut R2 in advance. it can. Then, the color gamut conversion unit 26 can specify that the region R4 is generated from the outer edge coordinates and the information indicating the outer edge of the color gamut R2.

In FIG. 5B, the color gamut R1 is clipped and converted into a color gamut R1 'that fits in the color gamut R2 that can be displayed on the display 28. The color gamut conversion unit 26 converts the vertex (x1, y1) outside the color gamut R2 within the color gamut R2 (for example, the line segment connecting the vertices (x1, y1) and (x2, y2), or the vertex (x1, y1)). And (x3, y3) and a point where the line defining the outer edge of the color gamut R2 intersects), this conversion can be performed. In order to prevent the image after conversion from becoming unnatural, it is preferable to move the vertices so that the shape of the region R1 'is as close as possible to the shape of the region R1.

[Example of color gamut conversion using area ratio information]
Next, an example of color gamut conversion using area ratio information (see (2) above) as color gamut information will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of color gamut conversion using area ratio information. Also in the example of the figure, the color gamut format of the received content is BT.2020. As the color gamut information, the ratio (N / M) of the color gamut area N of the received content to the BT.2020 color gamut area M is used. At present, it is impossible to transmit a video image with a color gamut that protrudes from the color gamut format of BT.2020. Therefore, the area M can be said to be a numerical value indicating the maximum color gamut.

As shown in FIG. 5A, the color gamut R2 that can be displayed on the display 28 is narrower than the color gamut R3 of BT.2020, and the color gamut R1 of the video of the received content protrudes outside the color gamut R2. . In this way, when the color gamut R1 protrudes greatly outside the color gamut R2, the value of N / M increases (approaches 1). Therefore, the color gamut conversion unit 26 determines whether or not the value of N / M exceeds a preset threshold value (set to a larger value as the display performance of the display 28 is higher), for example. Necessity can be determined. In addition, the color gamut conversion unit 26 may switch the conversion process to be applied according to the extent of the color gamut R1, that is, the magnitude of the N / M value. For example, a threshold value (threshold value B) larger than the above threshold value (referred to as threshold value A) is set in advance, and if B ≦ N / M, compression is performed, and if A ≦ N / M <B, Clipping may be performed.

In (b) of the figure, the color gamut R1 is compressed and converted into a color gamut R1 'that fits in the color gamut R2 that the display 28 can display. The degree of compression may be determined according to N / M (the larger the value of N / M, the stronger the compression is applied). Further, the color gamut conversion unit 26 may perform conversion into a color gamut R1 'that just fits in the color gamut R2 by using the outer edge coordinates of the color gamut R1. In this case, the area ratio and the outer edge coordinates are used in combination.

Furthermore, the color gamut conversion unit 26 may perform both compression and clipping. For example, if there is a region that still protrudes outside the color gamut R2 in the color gamut R1 ′ after compression, the region may be clipped so as to be within the color gamut R2. .

[Example of color gamut conversion using the ratio of the area of the protruding area]
Next, an example of color gamut conversion using information (see (3) above) indicating the ratio of the area of the protruding area as color gamut information will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of color gamut conversion using information indicating the ratio of the area of the protruding region. Also in the example of the figure, the color gamut format of the received content is BT.2020. As the color gamut information, the ratio n (%) of the area of the color gamut R4 that protrudes outside the color gamut R2 ′ of BT.709 of the color gamut R1 with respect to the area of the color gamut R1 of the video of the received content. BT.709, n (%), which is the information shown, is used.

As shown in (a) of the figure, the color gamut R2 ′ of BT.709, which is the color gamut format of high-definition broadcasting, is narrower than the color gamut R3 of BT.2020, and in the color gamut R1 of the video of the received content. A color gamut R4 that protrudes outside the color gamut R2 ′ is generated. Therefore, when the content is displayed on a display that is assumed to be a general high-definition broadcast display output, there is a high possibility that color gamut conversion is required.

Therefore, when n> 0, that is, when there is a color gamut R4 that protrudes outside the color gamut R2 ′, the color gamut conversion unit 26, as shown in FIG. R1 is converted so as to be within the color gamut R2 ′ to be a color gamut R1 ′. In this example, compression is performed. However, clipping can be performed if the position of the color gamut R4 can be specified by using outer edge coordinates. Further, both compression and clipping may be performed.

Here, depending on the content, as shown in FIG. 5C, the color gamut R1 is narrower than the color gamut R2 ′ of BT.709 (included in the color gamut R2 ′ of BT.709). There is also a possibility. In this case, since the color gamut R4 does not exist, n = 0.

In such a case, the color gamut conversion unit 26 expands the color gamut R1 within a range that can be accommodated within the color gamut R2 ′ as shown in FIG. Good. Thereby, the color gamut of the content can be expanded and the performance of the display 28 can be utilized to the maximum extent.

[Supported format information / non-supported format information]
Next, the corresponding format information (above (4)) and the incompatible format information (above (5)), which are one of the color gamut information, will be described with reference to FIG. FIG. 6 is a diagram for explaining the corresponding format information and the non-compatible format information.

In FIG. 6, on the chromaticity plane, the color gamut R1 of the received content video, the color gamut R2 that can be displayed on the display 28, the color gamut R3 of BT.2020, the color gamut R5 of BT.709, and the color gamut of AdobeRGB R6 is shown. Thus, each color gamut format such as BT.2020, BT.709, and AdobeRGB defines a unique color gamut. A color gamut R2 that can be displayed on the display is also determined in advance. However, from the transmitter 1 side, it is substantially difficult to specify the color gamut of the display for each of a large number of receivers that receive broadcasts.

Here, in general, the display is designed to have a performance according to a compliant color gamut format. For example, if the display is intended for display of high-definition broadcast content, it is likely that at least the BT.709 color gamut is designed to be displayed, but part of the BT.2020 color gamut is displayed. It may not be possible.

Therefore, by using the corresponding format information and the non-compatible format information, it is possible to determine whether or not the gamut conversion is necessary on the receiver 2 side, and to determine the method when performing the gamut conversion.

For example, in the example of FIG. 6, the color gamut R1 of the received content video is completely included in the color gamut R3 of BT.2020 and the color gamut R6 of AdobeRGB, and does not protrude. Therefore, information indicating at least one of BT.2020 and AdobeRGB may be used as the corresponding format information of the content. The gamut conversion unit 26 of the receiver 2 that has received this information can determine whether or not conversion is necessary by determining whether or not the display 28 conforms to the gamut format indicated by the information. it can. For example, if the display 28 conforms to the color gamut format indicated by the corresponding format information or a color gamut format having a wider color gamut, it can be determined that conversion is unnecessary. On the other hand, if the display 28 does not conform to the color gamut format indicated by the corresponding format information or conforms to a color gamut format having a narrower color gamut, it can be determined that conversion is necessary. .

In the example of FIG. 6, since the color gamut R1 of the video of the received content protrudes from the color gamut R5 of BT.709, information indicating BT.709 is used as non-compatible format information of the content. You can also. The gamut conversion unit 26 of the receiver 2 that has received the incompatible format information has a display 28 that conforms to the gamut format indicated by the incompatible format information or a gamut format with a narrower gamut. Then, it can be determined that conversion is necessary.

Note that the color gamut format indicated by the compatible format information or the non-compatible format information is not limited to the above example. For example, BT.601, NTSC (National Television System Committee), sRGB (standard RGB), xvYCC, or the like may be used.

Also, as described in (2) and (3) above, instead of using such an existing color gamut, the color gamut may be indicated by a uniquely set standard. For example, if it is determined that the color gamut R1 in FIG. 6 corresponds to LCD Level 5 according to a uniquely set standard, corresponding format information indicating LCD Level 5 may be transmitted to the receiver 2. Then, the receiver 2 may determine whether or not conversion is necessary based on whether or not the display 28 can display the color gamut of LCD Level 5.

In addition, when the color gamut R1 in the example of FIG. 6 is represented by area ratio information, it can be represented in the format of BT.2020 65% or AdobeRGB 75%, for example. As described above, even if the color gamut R1 of the video is the same, various types of information can be applied as the color gamut information corresponding thereto.

[Color Gamut Information Acquisition Processing]
Next, acquisition of color gamut information will be described with reference to FIG. FIG. 7 is a flowchart illustrating an example of processing for acquiring color gamut information executed by the receiver 2. First, the control information acquisition unit 32 extracts MPT from the signal output from the demultiplexing unit 23, and further extracts a descriptor (descriptor) from the extracted MPT (S1).

Next, the control information acquisition unit 32 determines whether the extracted descriptor is a gamut information descriptor (S2). Specifically, when the descriptor_tag value of the extracted descriptor matches the tag value previously assigned to the color gamut information, the control information acquisition unit 32 uses the descriptor of the color gamut information. It is determined that

Here, when it is determined that the descriptor is not a gamut information descriptor (NO in S2), the control information acquisition unit 32 determines whether or not the next descriptor is included in the MPT (S3). If the control information acquisition unit 32 determines that it is included (YES in S3), it returns to the process of S1, extracts the next descriptor, and determines that it is not included (NO in S3). The process is terminated.

On the other hand, when it is determined in S2 that the descriptor extracted in S1 is a gamut information descriptor (YES in S2), the control information acquisition unit 32 analyzes the descriptor and includes the color included in the descriptor. Extract region information. Then, the extracted color gamut information is transmitted to the color gamut conversion unit 26 (S4), and the process ends.

[Color Gamut Conversion Processing]
Next, color gamut conversion will be described with reference to FIG. FIG. 8 is a flowchart illustrating an example of color gamut conversion processing executed by the receiver 2. This process is a process executed by the color gamut conversion unit 26 that has received the color gamut information transmitted in the process of S4 of FIG. Here, an example in which outer edge coordinates are received as color gamut information will be described.

First, the color gamut conversion unit 26 compares the color gamut of the received content video indicated by the received color gamut information with the color gamut of the display 28 (S10). Then, it is determined whether or not the color gamut of the video is larger, in other words, whether or not the color gamut of the video is within the color gamut of the display 28 (S11).

Here, when it is determined that the color gamut of the video is within the color gamut of the display 28 (NO in S11), the color gamut conversion unit 26 does not perform the color gamut conversion (S15) and ends the process. In this case, the received video of the content is displayed on the display 28 without color gamut conversion. If NO is determined in S <b> 11, the color gamut conversion unit 26 may extend the color gamut of the video within a range that falls within the color gamut of the display 28.

On the other hand, if it is determined that the color gamut of the video protrudes from the color gamut of the display 28 (YES in S11), the color gamut conversion unit 26 determines whether the color gamut of the video is 10% or more larger. (S12). In this determination, for example, on the chromaticity plane, the area of the video gamut calculated from the outer edge coordinates received as the gamut information is compared with the area of the gamut of the display 28 on the same chromaticity plane. Can be done.

When the color gamut conversion unit 26 determines that the color gamut of the video is 10% or more (YES in S12), the video gamut conversion unit 26 performs compression processing on the video so as to be within the color gamut of the display 28. (S13). On the other hand, if it is determined that the difference in color gamut is less than 10% (NO in S12), the video is subjected to clipping processing so that it falls within the color gamut of the display 28 (S14). Thus, the color gamut conversion process is completed.

In the above example, the criterion for determining whether to perform clipping processing or compression processing is whether or not the color gamut of the video is 10% or more larger than the color gamut of the display 28. It is not limited to examples.

[Embodiment 2: Modification]
The transmitter 1 of the above embodiment has both a function as a control information generation device that generates control information for reproducing content and a function as a transmission device that transmits a digital broadcast signal. However, a function similar to that of the transmitter 1 can be realized by a combination of a control information generating device and a transmitting device that are independent from each other.

[Embodiment 3: Implementation by software]
Control blocks of transmitter 1 and receiver 2 (especially control unit 15, multiplexing unit 12, encryption unit 13, decoding unit 22, demultiplexing unit 23, color gamut conversion unit 26, display control unit 27, and control unit) 29) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit).

In the latter case, the transmitter 1 and the receiver 2 are a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read that records the above-described program and various data so that the computer (or CPU) can read them. Only Memory) or a storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A control information generation device (transmitter 1) according to aspect 1 of the present invention is a control information generation device that generates control information for reproducing content transmitted by MMT, and the color gamut of the video of the content A color gamut information acquisition unit (17) that acquires color gamut information relating to the color gamut, and a control information generation unit (18) that generates an MMT package table including the color gamut information.

According to the above configuration, an MMT package table (MPT) including color gamut information is generated. Here, the MPT is transmitted to the receiving device together with the content, and the receiving device reproduces the content while referring to the MPT. Therefore, according to the above configuration, the receiving device that has received the MPT can adaptively convert the color gamut of the content in accordance with the color gamut information. In particular, since MPT is periodically transmitted at short time intervals of about 1 second or less, it is possible to convert the color gamut by following the change in content in substantially real time.

In the control information generation device according to aspect 2 of the present invention, in the aspect 1, the color gamut information includes outer edge coordinates indicating an outer edge of the color gamut of the content represented on a chromaticity space or a chromaticity plane. It may be.

According to the above configuration, the color gamut information includes the outer edge coordinates indicating the outer edge of the color gamut of the content represented on the chromaticity space or the chromaticity plane. Therefore, the receiving apparatus that has acquired the MPT can specify how wide the color gamut of the content received together with the MPT is. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generation device according to aspect 3 of the present invention, in the

aspect

1 or 2, the color gamut information includes, as a comparison target between the area occupied by the color gamut of the content on the chromaticity plane and the color gamut. Area ratio information indicating a ratio of a predetermined color gamut to an area occupied on the chromaticity plane may be included.

According to the above configuration, in the color gamut information, the area occupied by the content color gamut on the chromaticity plane and the color gamut predetermined as a comparison target with the color gamut occupy on the chromaticity plane. Area ratio information indicating the ratio with the area is included. Therefore, the receiving apparatus that has acquired the MPT can specify how large or how small the color gamut of the content received together with the MPT is compared with the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

Note that the color gamut to be compared is not limited as long as the color gamut can be recognized on the receiving device side. For example, the color gamut defined by the existing color gamut format (color gamut defined by the existing video standard) There may be a color gamut set independently of the color gamut of the existing color gamut format.

In the control information generating device according to aspect 4 of the present invention, in any one of the aspects 1 to 3, the color gamut information includes a color gamut determined in advance as a comparison target with the color gamut. Information indicating the degree of going out of the area may be included.

According to the above configuration, the color gamut information includes information indicating the degree to which the color gamut of the content is outside the color gamut predetermined as a comparison target with the color gamut. Therefore, the receiving device that has acquired the MPT can specify how much the color gamut of the content received together with the MPT protrudes from the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generation device according to aspect 5 of the present invention, in any of the above aspects 1 to 4, the color gamut information includes a corresponding standard indicating a video standard in which a color gamut including a color gamut of the content is defined. Information (corresponding format information) may be included.

According to the above configuration, the color gamut information includes the corresponding standard information indicating the video standard in which the color gamut including the color gamut of the content is defined. Therefore, the receiving device that has acquired the MPT determines that the display of the content can be displayed without converting the color gamut of the content if the display conforms to the video standard. Can do. On the other hand, if the display for displaying the content does not conform to the video standard or conforms to a video standard having a narrower color gamut than the video standard, it is necessary to convert the color gamut of the content. It can be determined that there is. Therefore, according to said structure, according to the display which displays a content, the said color gamut of the said content can be displayed appropriately, without converting.

In the control information generation device according to aspect 6 of the present invention, in any one of the above aspects 1 to 5, the color gamut information includes a video standard in which a color gamut that does not include at least a part of the color gamut of the content is defined. Non-compliant standard information (non-compliant format information) may be included.

According to the above configuration, the color gamut information includes non-compliant standard information indicating a video standard in which a color gamut that does not include at least a part of the color gamut of the content is included. Therefore, the receiving device that has acquired the MPT has the content displayed when the display on which the content is displayed is compliant with the video standard or the video standard having a narrower color gamut than the video standard. It can be determined that the color gamut of the image needs to be converted. Therefore, according to said structure, according to the display which displays a content, the color gamut of the said content can be converted appropriately and this content can be displayed appropriately.

A transmission apparatus (transmitter 1) according to aspect 7 of the present invention provides the control information generation apparatus according to any one of aspects 1 to 6 and the MMT package table generated by the control information generation apparatus as a digital broadcast signal together with the content. And a transmission unit 14 for transmission.

According to the above configuration, the MMT package table generated by the control information generation device is transmitted as a digital broadcast signal together with the content. Therefore, the receiving apparatus that has received the digital broadcast signal can reproduce the content after adaptively converting the color gamut of the content according to the color gamut information included in the MMT package table. .

A receiving apparatus (receiver 2) according to an aspect 8 of the present invention is a receiving apparatus that receives content transmitted by MMT, and obtains an MMT package table including color gamut information related to the color gamut of the video of the content. A control information acquisition unit (32) that performs the conversion, and a color gamut conversion unit (color gamut conversion unit 26) that converts the color gamut of the video of the content according to the color gamut information.

According to the above configuration, the MMT package table including the color gamut information related to the color gamut of the content video is acquired, and the color gamut of the content video is converted according to the color gamut information. Therefore, according to the above configuration, the content can be reproduced after adaptively converting the color gamut of the content according to the color gamut information. In particular, since MPT is periodically transmitted at short time intervals of about 1 second or less, it is possible to convert the color gamut by following the change in content in substantially real time.

A television receiver according to aspect 9 of the present invention includes the receiving device according to aspect 8 above. Therefore, the same function and effect as those of the receiving device of aspect 8 are obtained.

A video signal transmission system 5 according to an aspect 10 of the present invention is a video signal transmission system including a transmission device (transmitter 1) that transmits content using MMT and a reception device (receiver 2) that receives the content. The transmitting device transmits an MMT package table including color gamut information indicating a color gamut of the video of the content to the receiving device together with the content as a digital broadcast signal, and the receiving device receives the digital broadcast signal from the digital broadcast signal. An MMT package table is acquired, and the color gamut of the content video is converted according to the color gamut information. Therefore, there exists an effect similar to the control information generator of aspect 1, and the receiver of aspect 8.

The control information generation device, the transmission device, and the reception device according to each aspect of the present invention may be realized by a computer. In this case, each unit included in the control information generation device, the transmission device, or the reception device. The control information generation device, the transmission device, or the reception device that is realized as a computer by operating as a computer, and a computer-readable recording medium that records the control program also fall within the scope of the present invention.
[Description I of related embodiments]
Embodiments 4 to 6 will be described below.

[Mode for Carrying Out the Invention]
Hereinafter, a fourth embodiment of the present invention will be described in detail with reference to FIGS. First, the configuration of the video signal transmission system according to the present embodiment will be described with reference to FIG. FIG. 9 is a block diagram illustrating an example of a main configuration of a transmitter (control information generation device, transmission device) 1a and a receiver (reception device) 2a included in the video signal transmission system 5a.

The video signal transmission system 5a is a system for transmitting a video signal and the like from the transmitter 1a to the receiver 2a. The video signal transmission system 5a is mainly characterized in that color gamut information indicating the color gamut of the video to be transmitted is transmitted together with the video signal, thereby performing optimal color gamut conversion according to the video. It is possible. In the current digital broadcasting, signals are transmitted in the MPEG-2 (Moving / Picture Experts / Group / phase 2) TS (Transport Stream) format. Therefore, in this embodiment, an example in which a video signal is transmitted in the TS format will be described.

The transmitter 1a transmits content in the form of a video signal or the like. More specifically, the transmitter 1a transmits each packet (TS packet) constituting the content through a broadcast path (broadcast transmission path). One receiver 2a has a function of receiving this content (content distributed through a broadcast route), and also has a function of receiving content distributed through a communication route via a communication network such as the Internet, for example. . And the receiver 2a can reproduce | regenerate combining each content received via these two paths | routes. In the figure, only one receiver 2 is shown, but the transmitter 1a broadcasts content to a plurality of receivers 2a.

[Configuration of transmitter]
As shown in the figure, the transmitter 1a includes an audio encoder 10a, a video encoder 11a, a multiplexing unit 12a, an encryption unit 13a, a transmission unit 14a, and a control unit 15a. The control unit 15a includes an encoding control unit 16a, a color gamut information acquisition unit 17a, and a control information generation unit 18a.

The audio encoder 10a encodes (encodes) the audio (sound) stream of the content transmitted by the transmitter 1a and outputs the encoded audio (sound) stream to the multiplexing unit 12a. Similarly, the video encoder 11a encodes (encodes) a video (video) stream of content transmitted by the transmitter 1 and outputs the encoded video (video) stream to the multiplexing unit 12a.

The multiplexing unit 12a multiplexes the audio stream output from the audio encoder 10a, the video stream output from the video encoder 11a, and the control information output from the control unit 15a, and outputs the multiplexed information to the encryption unit 13a.

The encryption unit 13a encrypts the multiplexed stream output from the multiplexing unit 12a and outputs the encrypted stream to the transmission unit 14a. Then, the transmission unit 14a transmits the encrypted data output from the encryption unit 13a as a packet to the receiver 2a through the broadcast path in the form of a digital broadcast signal.

The control unit 15a controls each unit included in the transmitter 1a. Specifically, the encoding control unit 16a included in the control unit 15a controls the audio encoder 10a and the video encoder 11a to perform encoding.

The color gamut information acquisition unit 17a acquires color gamut information, which is information related to the color gamut of the content transmitted by the transmitter 1a, and outputs the acquired color gamut information to the control information generation unit 18a. The method for obtaining the color gamut information is not particularly limited. For example, the color gamut of the content obtained by the shooting is determined from the model of the camera used for shooting, so the color gamut information is obtained from the information of the camera used for shooting. You may get it. Further, when video processing is performed on the content, the color gamut of the content may be specified depending on the equipment used for the video processing. In this case, the color gamut information may be acquired from the information on the equipment used for the video processing. In addition to this, for example, the color gamut information may be acquired by performing video analysis of the content at an arbitrary timing such as the time of editing. Details of the color gamut information will be described later.

The control information generator 18a generates control information for reproducing the content transmitted by the transmitter 1a. This control information is called PSI / SI (Program Specific Information / Service Information) in the TS, and includes various information related to the content. Here, in the PSI / SI, information related to the content program is described. A description will be given focusing on the generation of the generated PMT (Program Map table).

As described above, in the transmitter 1a, the color gamut information acquisition unit 17a executes the process of acquiring the color gamut information (color gamut information acquisition step). And the control information generation part 18 performs the process (control information generation step) which produces | generates the control information (PMT) containing the said color gamut information. Therefore, in the receiver 2a that has received the PMT, it is possible to display the content received together with the PMT with appropriate conversion (or without conversion) according to the color gamut information.

When the content transmitted by the transmitter 1a is switched, the color gamut information acquisition unit 17a acquires the color gamut information of the content after switching, and the control information generation unit 18a generates a PMT including this color gamut information. As described above, by generating a PMT including different color gamut information following the change of the content, it is possible to always reproduce the content by optimal conversion.

[Configuration of receiver]
As shown, the receiver 2a includes a tuner 20a, a communication I / F 21a, a decoding unit 22a, a demultiplexing unit 23a, an audio decoder 24a, a video decoder 25a, a color gamut conversion unit 26a, a display control unit 27a, a display 28a, And a control unit 29a. The control unit 29a includes a decoding control unit 30a, a demultiplexing control unit 31a, and a control information acquisition unit 32a.

The tuner 20a receives the content transmitted as a digital broadcast signal through the broadcast path and outputs it to the decoding unit 22a. On the other hand, the communication I / F 21a receives the content transmitted through the communication path and outputs it to the decryption unit 22a.

When the content received via the tuner 20a and the communication I / F 21a is encrypted, the decryption unit 22a decrypts the content and outputs it to the demultiplexing unit 23a.

The demultiplexing unit 23a demultiplexes the data output from the decryption unit 22a (encrypted but decrypted). Then, each component (component) of the content obtained by demultiplexing is processed according to the type of the component. Specifically, the demultiplexing unit 23a outputs the audio component to the audio decoder 24a, the video component to the video decoder 25a, and the control information to the control information acquisition unit 32a.

The audio decoder 24a decodes the audio component output from the demultiplexing unit 23a and outputs audio data. Similarly, the video decoder 25a decodes the video component output from the demultiplexer 23a and outputs video data.

The color gamut conversion unit 26a determines whether or not color gamut conversion is necessary based on the color gamut information. When conversion is necessary, the method is also determined, and the color gamut of the video data output from the video decoder 25a is converted by the determined method. By this conversion, the color gamut of the video data output from the video decoder 25a falls within the range of the color gamut that can be displayed on the display 28a. For example, if it is determined from the color gamut information that the color gamut of the video data to be reproduced is within the reproducible color gamut of the display 28a, it is determined not to convert. On the other hand, when it is determined that it is outside the reproducible color gamut of the display 28a, appropriate conversion is performed in accordance with the ratio existing outside. Note that the color gamut conversion unit 26a may be provided in the control unit 29a.

The display control unit 27a performs control to display the video data on the display 28a. The display 28a displays video data according to the control of the display control unit 27a. That is, the receiver 2a is a television receiver having a function for receiving and reproducing (displaying) broadcast content. The display 28a may be an external device externally attached to the receiver 2a.

The control unit 29a controls each unit included in the receiver 2a according to the received control information. Specifically, the decryption control unit 30a controls the decryption unit 22a to decrypt the content. In addition, the demultiplexing control unit 31a controls the demultiplexing unit 23a to perform demultiplexing of content. Then, the control information acquisition unit 32a acquires the control information output by the demultiplexing unit 23a demultiplexing, and if the control information includes color gamut information, the control information acquisition unit 32a converts the information into the color gamut conversion unit. To 26a.

[Example of PMT including color gamut information]
Next, an example of PMT including color gamut information will be described with reference to FIG. FIG. 10 is a diagram illustrating an example of a PMT including color gamut information. The illustrated PMT includes a descriptor D11 (version_number) indicating the version of the PMT, a descriptor D12 (program_number) indicating the program ID of the PMT, and a descriptor D13 (descriptor including color gamut information). ())It is included.

In the descriptor D13, a predetermined tag descriptor_tag indicating that the descriptor (descriptor) is a descriptor relating to color gamut information, a descriptor_length indicating the length of the descriptor, and a data body of color gamut information Data () is described. Note that the value of descriptor_tag only needs to be able to specify that the description about the color gamut information is included in the descriptor D13. For example, in ARIBDSTD-B10 that defines the standard for digital broadcasting, it indicates other descriptors. An unused value of “0xF0” may be used.

Here, in general, in television broadcasting, videos with different sources are transmitted continuously, and there is a possibility that videos of such different sources have different color gamuts. Therefore, in order to deal with such a case, when the source changes, the control information generation unit 18a updates the color gamut information in the PMT and also updates the version information of the PMT (the value of the descriptor D11). To do. In the receiver 2a, the control information acquisition unit 32a checks the color gamut information every time the PMT version is updated, and if there is an update, transmits the new color gamut information to the color gamut conversion unit 26a. As a result, it is possible to express an appropriate color according to the change of the video.

In the PMT of FIG. 10, outer edge coordinates indicating the outer edge in the chromaticity space of the color gamut of the video of the received content (to be reproduced) are stored as data (). However, the color gamut information described in data () is information related to the color gamut of the received content, and can be used to determine whether or not color gamut conversion is necessary and to determine the mode of conversion when conversion is necessary. However, the present invention is not limited to this example. For example, the color gamut information may include at least one of the following information.
(1) Outer coordinates indicating the outer edge of the color gamut (the color gamut of the video of the received content) on the chromaticity space or chromaticity plane, and (2) the area occupied by the color gamut of the received content on the chromaticity plane; Area ratio information indicating a ratio of a predetermined color gamut to the area on the chromaticity plane as a comparison target with the color gamut (3) A color gamut of received content is a comparison target with the color gamut Information indicating the degree of going out of the predetermined color gamut (4) Corresponding format information (corresponding standard information) indicating the color gamut format (video standard) in which the color gamut including the color gamut of the received content is defined )
(5) Non-compliant format information (non-compliant standard information) indicating a gamut format (video standard) in which a gamut that does not include at least a part of the gamut of the received content is defined
As a specific example, the outer edge coordinates in (1) above are described in a format such as [(x, y, z), (x, y, z), ..., (x, y, z)]. The outermost coordinates of the color gamut represented on the chromaticity space or chromaticity plane may be used. The outer edge coordinates only need to include coordinates of at least three points.

Further, the “color gamut predetermined as a comparison target” in the above (2) and (3) may be any as long as the color gamut can be recognized on the receiver 2a side. For example, the above-mentioned “color gamut predetermined as a comparison target” may be a color gamut defined by an existing color gamut format (video standard), or independent of a color gamut of an existing color gamut format. It may be a set color gamut. As an example of the former, the color gamut of BT.2020 is used as the “color gamut predetermined as a comparison target” in (2) above, and BT is used as the “color gamut predetermined as a comparison target” in (3) above. An example using the .709 color gamut is given. Note that the “color gamut predetermined as a comparison target” in (3) above is a color gamut in which the color gamut of the received content may protrude (a color narrower than the maximum color gamut that the received content can take) Area). Also, as an example of the latter, how wide and range the color gamut is for each type of display, such as LCD (Liquid Crystal Display) Level 10 and OLED (Organic Electro-Luminescence Display) Version 4. Examples are specified by version number and numerical level.

Thus, for example, it is possible to recognize that n% of protrusion occurs in the receiver 2a including the display 28 compliant with BT.709. Also, the conversion mode can be changed according to the magnitude of n. For example, when n is 30 to 50%, clipping is applied when the protruding portion is relatively small, and compression is applied when protruding portion is large, such as when n is 80% or more. It becomes possible. Note that n may be calculated by counting the number of pixels on the chromaticity plane. For example, n is calculated by the following equation: (the number of pixels outside the comparison color gamut among the pixels in the content color gamut) / (total number of pixels included in the content color gamut) × 100. Good.

[Example of color gamut conversion using outer edge coordinates]
Next, for an example of color gamut conversion using outer edge coordinates (see (1) above) as the color gamut information, the color gamut conversion unit 26a performs the same processing as that described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using area ratio information]
Subsequently, for an example of color gamut conversion using area ratio information (see (2) above) as color gamut information, the color gamut conversion unit 26a performs the same processing as the processing described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using the ratio of the area of the protruding area]
Subsequently, for an example of color gamut conversion using information (see (3) above) indicating the ratio of the area of the protruding area as the color gamut information, the color gamut conversion unit 26a performs the processing described with reference to FIG. Similar processing is performed. Further, the same effect as described with reference to FIG.

[Supported format information / non-supported format information]
Next, for the corresponding format information (above (4)) and the incompatible format information (above (5)), which is one of the gamut information, the gamut conversion unit 26a performs the same process as described with reference to FIG. Perform the process. Further, the same effect as described with reference to FIG.

[Color Gamut Information Acquisition Processing]
Next, acquisition of color gamut information will be described with reference to FIG. FIG. 11 is a flowchart illustrating an example of processing for obtaining color gamut information executed by the receiver 2a. First, the control information acquisition unit 32a extracts a PMT from the signal output from the demultiplexing unit 23a, and further extracts a descriptor (descriptor) from the extracted PMT (S21).

Next, the control information acquisition unit 32a determines whether the extracted descriptor is a gamut information descriptor (S22). Specifically, when the descriptor_tag value of the extracted descriptor matches the tag value previously assigned to the color gamut information, the control information acquisition unit 32a uses the descriptor of the color gamut information. It is determined that

Here, when it is determined that the descriptor is not a gamut information descriptor (NO in S22), the control information acquisition unit 32a determines whether the PMT includes the following descriptor (S23). If the control information acquisition unit 32a determines that it is included (YES in S23), the process returns to S21 to extract the next descriptor, and if it is determined that it is not included (NO in S23). The process is terminated.

On the other hand, when it is determined in S22 that the descriptor extracted in S21 is a descriptor of color gamut information (YES in S22), the control information acquisition unit 32a analyzes the descriptor and includes the color included in the descriptor. Extract region information. Then, the extracted color gamut information is transmitted to the color gamut conversion unit 26a (S24), and the process ends.

[Color Gamut Conversion Processing]
Next, color gamut conversion will be described with reference to FIG. FIG. 12 is a flowchart illustrating an example of color gamut conversion processing executed by the receiver 2a. This process is a process executed by the color gamut conversion unit 26a that has received the color gamut information transmitted in the process of S24 of FIG. Here, an example in which outer edge coordinates are received as color gamut information will be described.

First, the color gamut conversion unit 26a compares the color gamut of the received content video indicated by the received color gamut information with the color gamut of the display 28a (S30). Then, it is determined whether or not the color gamut of the video is larger, in other words, whether or not the color gamut of the video is within the color gamut of the display 28a (S31).

Here, when it is determined that the color gamut of the video is within the color gamut of the display 28a (NO in S31), the color gamut conversion unit 26a does not perform the color gamut conversion (S35) and ends the process. In this case, the received video of the content is displayed on the display 28a without color gamut conversion. If NO is determined in S31, the color gamut conversion unit 26a may extend the color gamut of the video within a range that fits within the color gamut of the display 28a.

On the other hand, if it is determined that the color gamut of the video protrudes from the color gamut of the display 28a (YES in S31), the color gamut conversion unit 26a determines whether the color gamut of the video is 10% or more larger. (S32). In this determination, for example, on the chromaticity plane, the area of the image gamut calculated from the outer edge coordinates received as the gamut information is compared with the area of the gamut of the display 28a on the same chromaticity plane. Can be done.

When the color gamut conversion unit 26a determines that the color gamut of the video is 10% or more (YES in S32), the video gamut conversion unit 26a performs compression processing on the video so as to be within the color gamut of the display 28a. (S33). On the other hand, if it is determined that the color gamut difference is less than 10% (NO in S32), the video is subjected to clipping processing so that it falls within the color gamut of the display 28a (S34). Thus, the color gamut conversion process is completed.

In the above example, the criterion for determining whether to perform clipping processing or compression processing is whether the color gamut of the video is 10% or more larger than the color gamut of the display 28a. It is not limited to examples.

[Embodiment 5: Modification]
The transmitter 1a of the above embodiment has both a function as a control information generation device that generates control information for reproducing content and a function as a transmission device that transmits a digital broadcast signal. However, a function similar to that of the transmitter 1 can be realized by a combination of a control information generating device and a transmitting device that are independent from each other.

[Embodiment 6: Implementation Example by Software]
Control blocks of transmitter 1a and receiver 2a (particularly control unit 15a, multiplexing unit 12a, encryption unit 13a, decryption unit 22a, demultiplexing unit 23a, color gamut conversion unit 26a, display control unit 27a, and control unit) 29a) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit).

In the latter case, the transmitter 1a and the receiver 2a include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read that records the above-described program and various data so that the computer (or CPU) can read them. Only Memory) or a storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A control information generation device (transmitter 1a) according to an aspect 11 of the present invention is a control information generation device that generates control information for reproducing content transmitted in a transport stream, and is a video information of the content. A color gamut information acquisition unit (17a) that acquires color gamut information related to the color gamut and a control information generation unit (18a) that generates a program map table including the color gamut information are provided.

According to the above configuration, a program map table (PMT) including color gamut information is generated. Here, the PMT is transmitted together with the content to the receiving device, and the receiving device reproduces the content while referring to the PMT. Therefore, according to the above configuration, the receiving device that has received the PMT can adaptively convert the color gamut of the content in accordance with the color gamut information. In particular, since the PMT is periodically transmitted at a short time interval of about 1 second or less, it is possible to convert the color gamut by following the change of the content substantially in real time.

In the control information generation device according to aspect 12 of the present invention, in the aspect 11, the color gamut information includes outer edge coordinates indicating the outer edge of the color gamut of the content represented on a chromaticity space or a chromaticity plane. It may be.

According to the above configuration, the color gamut information includes the outer edge coordinates indicating the outer edge of the color gamut of the content represented on the chromaticity space or the chromaticity plane. Therefore, the receiving apparatus that has acquired the PMT can specify how wide the color gamut of the content received together with the PMT is. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generation device according to aspect 13 of the present invention, in the

aspect

11 or 12, the color gamut information includes a comparison between the area occupied by the color gamut of the content on the chromaticity plane and the color gamut. Area ratio information indicating a ratio of a predetermined color gamut to an area occupied on the chromaticity plane may be included.

According to the above configuration, in the color gamut information, the area occupied by the content color gamut on the chromaticity plane and the color gamut predetermined as a comparison target with the color gamut occupy on the chromaticity plane. Area ratio information indicating the ratio with the area is included. Therefore, the receiving apparatus that has acquired the PMT can specify how large or how small the color gamut of the content received together with the PMT is compared with the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

Note that the color gamut to be compared is not limited as long as the color gamut can be recognized by the receiving device, and is, for example, a color gamut defined by an existing color gamut format (a color gamut defined by an existing video standard). There may be a color gamut set independently of the color gamut of the existing color gamut format.

In the control information generation device according to the fourteenth aspect of the present invention, in any one of the eleventh to thirteenth aspects, the color gamut of the content includes a color that is determined in advance as a comparison target with the color gamut. Information indicating the degree of going out of the area may be included.

According to the above configuration, the color gamut information includes information indicating the degree to which the color gamut of the content is outside the color gamut predetermined as a comparison target with the color gamut. Therefore, the receiving apparatus that has acquired the PMT can specify how much the color gamut of the content received together with the PMT protrudes from the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generating device according to aspect 15 of the present invention, in any of the above aspects 11 to 14, the color gamut information includes a corresponding standard indicating a video standard in which a color gamut including the color gamut of the content is defined. Information (corresponding format information) may be included.

According to the above configuration, the color gamut information includes the corresponding standard information indicating the video standard in which the color gamut including the color gamut of the content is defined. Therefore, the receiving device that has acquired the PMT determines that the display for displaying the content can be displayed without converting the color gamut of the content if the display conforms to the video standard. Can do. On the other hand, if the display for displaying the content does not conform to the video standard or conforms to a video standard having a narrower color gamut than the video standard, it is necessary to convert the color gamut of the content. It can be determined that there is. Therefore, according to said structure, according to the display which displays a content, the said color gamut of the said content can be displayed appropriately, without converting.

In the control information generation device according to aspect 16 of the present invention, in any of the aspects 11 to 15, the color gamut information includes a video standard in which a color gamut that does not include at least a part of the color gamut of the content is defined. Non-compliant standard information (non-compliant format information) may be included.

According to the above configuration, the color gamut information includes non-compliant standard information indicating a video standard in which a color gamut that does not include at least a part of the color gamut of the content is included. Therefore, the receiving device that has acquired the PMT has the content displayed when the display for displaying the content is compliant with the video standard or when the display is compliant with a video standard having a narrower color gamut than the video standard. It can be determined that the color gamut of the image needs to be converted. Therefore, according to said structure, according to the display which displays a content, the color gamut of the said content can be converted appropriately and this content can be displayed appropriately.

A transmission apparatus (transmitter 1a) according to aspect 17 of the present invention uses the control information generation apparatus according to any one of aspects 11 to 16 and the program map table generated by the control information generation apparatus as a digital broadcast signal together with the content. A transmission unit 14a for transmission.

According to the above configuration, the program map table generated by the control information generating device is transmitted as a digital broadcast signal together with the content. Therefore, it is possible to cause the receiving device that has received the digital broadcast signal to reproduce the content after adaptively converting the color gamut of the content in accordance with the color gamut information included in the program map table. .

A receiving apparatus (receiver 2a) according to an aspect 18 of the present invention is a receiving apparatus that receives content transmitted in a transport stream, and includes a program map table including color gamut information related to the color gamut of the video of the content A control information acquisition unit (32a) that acquires the image, and a color gamut conversion unit (26a) that converts the color gamut of the video of the content according to the color gamut information.

According to the above configuration, the program map table including the color gamut information related to the color gamut of the content video is acquired, and the color gamut of the content video is converted according to the color gamut information. Therefore, according to the above configuration, the content can be reproduced after adaptively converting the color gamut of the content according to the color gamut information. In particular, since the PMT is periodically transmitted at a short time interval of about 1 second or less, it is possible to convert the color gamut by following the change of the content substantially in real time.

A television receiver according to the nineteenth aspect of the present invention includes the receiving device according to the eighteenth aspect. Therefore, the same function and effect as those of the receiving device according to aspect 18 are obtained.

The video signal transmission system 5a according to the aspect 20 of the present invention includes a video signal transmission system including a transmission device (transmitter 1a) that transmits content in a transport stream and a reception device (receiver 2a) that receives the content. The transmission device transmits a program map table including color gamut information indicating the color gamut of the video of the content as a digital broadcast signal to the reception device together with the content, and the reception device transmits the digital broadcast signal. The program map table is acquired from the above, and the color gamut of the video of the content is converted according to the color gamut information. Therefore, there exists an effect similar to the control information generator of aspect 11, and the receiver of aspect 18.

The control information generation device, the transmission device, and the reception device according to each aspect of the present invention may be realized by a computer. In this case, each unit included in the control information generation device, the transmission device, or the reception device. The control information generation device, the transmission device, or the reception device that is realized as a computer by operating as a computer, and a computer-readable recording medium that records the control program also fall within the scope of the present invention.
[Description II of Related Embodiments]
Embodiments 7 to 9 will be described below.

[Mode for Carrying Out the Invention]
Hereinafter, Embodiment 7 of the present invention will be described in detail with reference to FIGS. First, the configuration of the video signal transmission system according to the present embodiment will be described with reference to FIG. FIG. 13 is a block diagram illustrating an example of a main configuration of a transmitter (control information generation device, transmission device) 1b and a receiver (reception device) 2b included in the video signal transmission system 5b.

The video signal transmission system 5b is a system for transmitting a video signal and the like from the transmitter 1b to the receiver 2b. The video signal transmission system 5b is mainly characterized in that color gamut information indicating the color gamut of the video to be transmitted is added to the video signal and transmitted, so that optimal color gamut conversion corresponding to the video can be performed. Making it possible to do. In the current digital broadcasting, signals are transmitted in a TS (Transport Stream) format of MPEG-2 (Moving Picture Experts Group Phase 2) system. In this embodiment, an example in which a video signal is transmitted in the TS format will be described. However, the format for transmitting a video signal is not limited to this. For example, in the next-generation 4K / 8K broadcasting, it is considered that a signal is transmitted in the MMT (MPEG Media Transport) format. Even when a video signal is transmitted in the MMT format, the video signal transmission system 5b is used. It is possible to apply.

The transmitter 1b transmits content in the form of a video signal or the like. More specifically, the transmitter 1b transmits each packet (TS packet) constituting the content through a broadcast path (broadcast transmission path). One receiver 2b has a function of receiving this content (content distributed through a broadcast path) and also has a function of receiving content distributed through a communication path via a communication network such as the Internet. . And the receiver 2b can reproduce | regenerate combining each content received via these two paths | routes. In the figure, only one receiver 2b is shown, but the transmitter 1b broadcasts content to a plurality of receivers 2b.

[Configuration of transmitter]
As illustrated, the transmitter 1b includes an audio encoder 10b, a video encoder 11b, a multiplexing unit 12b, an encryption unit 13b, a transmission unit 14b, and a control unit 15b. The control unit 15b includes an encoding control unit 16b, a color gamut information acquisition unit 17b, and a control information generation unit 18b.

The audio encoder 10b encodes (encodes) the audio (sound) stream of the content transmitted by the transmitter 1b and outputs it to the multiplexing unit 12. Similarly, the video encoder 11b encodes (encodes) the video (video) stream of the content transmitted by the transmitter 1b and outputs it to the multiplexing unit 12b.

The multiplexing unit 12b multiplexes the audio stream output from the audio encoder 10b, the video stream output from the video encoder 11b, and the control information output from the control unit 15b, and outputs the multiplexed information to the encryption unit 13b.

The encryption unit 13b encrypts the multiplexed stream output from the multiplexing unit 12b and outputs the encrypted stream to the transmission unit 14b. Then, the transmission unit 14b transmits the encrypted data output from the encryption unit 13b as a packet to the receiver 2b through the broadcast path in the form of a digital broadcast signal.

The control unit 15b performs control of each unit included in the transmitter 1b. Specifically, the encoding control unit 16b included in the control unit 15b controls the audio encoder 10b and the video encoder 11b to perform encoding.

The color gamut information acquisition unit 17b acquires color gamut information that is information regarding the color gamut of the content transmitted by the transmitter 1b, and outputs the acquired color gamut information to the control information generation unit 18b. Here, the “content transmitted by the transmitter 1b” includes content that is scheduled to be transmitted by the transmitter 1b, that is, content that is scheduled to be broadcast. The method for obtaining the color gamut information is not particularly limited. For example, the color gamut of the content obtained by the shooting is determined from the model of the camera used for shooting, so the color gamut information is obtained from the information of the camera used for shooting. You may get it. Further, when video processing is performed on the content, the color gamut of the content may be specified depending on the equipment used for the video processing. In this case, the color gamut information may be acquired from the information on the equipment used for the video processing. In addition to this, for example, the color gamut information may be acquired by performing video analysis of the content at an arbitrary timing such as the time of editing. Details of the color gamut information will be described later.

The control information generation unit 18b generates control information for reproducing the content transmitted by the transmitter 1b. This control information is called PSI / SI (Program Specific Information / Service Information) in the TS, and includes various information related to the content. Here, information regarding the content of the PSI / SI is described. The description will focus on the generation of the generated EIT (Event Information Table). In the next-generation ultra-high-definition television broadcasting, an EIT called MH-EIT (MPEG-H Event Information Table) is used. In the present specification, the term “EIT” includes both “EIT of current broadcasting” and “MH-EIT”.

As described above, in the transmitter 1b, the color gamut information acquisition unit 17b performs the process of acquiring the color gamut information (color gamut information acquisition step). Then, the control information generation unit 18b executes a process (control information generation step) for generating control information (EIT) including the color gamut information. Therefore, in the receiver 2b that has received this EIT, it is possible to display the content after performing appropriate conversion according to the color gamut information (or without performing conversion).

Note that the color gamut information acquisition unit 17b acquires the color gamut information of each content for each content transmitted by the transmitter 1b, and the control information generation unit 18b generates an EIT including this color gamut information. Thus, by generating EIT including different color gamut information for each content, it is possible to always reproduce the content by optimal conversion.

As described above, since the transmitter 1b is configured to transmit EIT including color gamut information, the color gamut information can be transmitted without changing the conventional configuration.

[Configuration of receiver]
As illustrated, the receiver 2b includes a tuner 20b, a communication I / F 21b, a decoding unit 22b, a demultiplexing unit 23b, an audio decoder 24b, a video decoder 25b, a color gamut conversion unit 26b, a display control unit 27b, a display (display). Section) 28b, a control section 29b, and an OSD generation section (program table generation section) 33b. The control unit 29b includes a decoding control unit 30b, a demultiplexing control unit 31b, and a control information acquisition unit 32b.

The tuner 20b receives content and the like transmitted as a digital broadcast signal through the broadcast path and outputs them to the decoding unit 22b. On the other hand, the communication I / F 21b receives content and the like transmitted through the communication path and outputs them to the decoding unit 22b.

When the content received via the tuner 20b and the communication I / F 21b is encrypted, the decryption unit 22b decrypts the content and outputs it to the demultiplexing unit 23b.

The demultiplexing unit 23b demultiplexes the data output from the decryption unit 22b (encrypted but decrypted). Then, each component (component) of the content obtained by demultiplexing is processed according to the type of the component. Specifically, the demultiplexer 23b outputs the audio component to the audio decoder 24b, outputs the video component to the video decoder 25b, and outputs the control information to the control information acquisition unit 32b.

The audio decoder 24b decodes the audio component output from the demultiplexer 23b and outputs audio data. Similarly, the video decoder 25b decodes the video component output from the demultiplexer 23b and outputs video data.

The color gamut conversion unit 26b determines whether or not color gamut conversion is necessary based on the color gamut information. In the present embodiment, since color gamut information is included in the EIT, it is possible to determine whether or not color gamut conversion of the video of the content is necessary prior to the content broadcast. When conversion is necessary, the method is also determined, and the color gamut of the video data output from the video decoder 25b is converted by the determined method. By this conversion, the color gamut of the video data output from the video decoder 25b falls within the range of the color gamut that can be displayed on the display 28b. For example, if it is determined from the color gamut information that the color gamut of the video data to be reproduced is within the reproducible color gamut of the display 28b, it is determined not to convert. On the other hand, when it is determined that the color gamut is outside the reproducible color gamut of the display 28b, appropriate conversion is performed according to the ratio of the color outside. Note that the color gamut conversion unit 26b may be provided in the control unit 29b.

The display control unit 27b performs control to display the video data on the display 28b. The display 28b displays video data according to the control of the display control unit 27b. That is, the receiver 2b is a television receiver having a function for receiving and reproducing (displaying) content to be broadcast. The display 28b may be an external device externally attached to the receiver 2b.

The control unit 29b controls each unit included in the receiver 2b according to the received control information. Specifically, the decryption control unit 30b controls the decryption unit 22b to decrypt the content. Further, the demultiplexing control unit 31b controls the demultiplexing unit 23b to perform demultiplexing of content. The control information acquisition unit 32b acquires the control information output by the demultiplexing unit 23b being demultiplexed, outputs the control information to the OSD generation unit 33b, and includes color gamut information in the control information. Outputs this information to the color gamut conversion unit 26b.

The OSD generation unit 33b refers to the control information (EIT) output from the control information acquisition unit 32b, and generates an OSD image indicating an electronic program guide (EPG: Electronic Program Guide). When the control information includes color gamut information, the electronic program guide generated by the OSD generation unit 33b can further include color gamut information of each content. In particular, when the color gamut information is described in the EIT as text as will be described later, the color gamut information of each content can be presented in an easy-to-understand manner for the user. The OSD image generated by the OSD generation unit 33b is superimposed on the video data output from the color gamut conversion unit 26b and supplied to the display control unit 27b. The OSD generation unit 33b may be provided in the control unit 29b.

Note that the OSD generation unit 33b may acquire the control information output by the demultiplexing unit 23b performing demultiplexing. In the above case, the OSD generation unit 33b analyzes the control information to generate an OSD image indicating an electronic program guide. When the control information includes color gamut information, the OSD generation unit 33b converts the information into color gamut conversion. It is good also as a structure so that it may output to the part 26b. In the above case, the control information acquisition unit can be realized with a minimum change without adding a new configuration to the conventional configuration.

[Example of EIT including color gamut information]
Next, an example of EIT including color gamut information will be described with reference to FIG. FIG. 14A is a diagram illustrating an example of an EIT including color gamut information. The illustrated EIT includes a descriptor D21 (version_number) indicating the version of the EIT and a descriptor D22 (service_id) indicating the service ID of the EIT, and a descriptor D23 (descriptor) including color gamut information. ())It is included.

In the descriptor D23, a predetermined tag descriptor_tag indicating that the descriptor (descriptor) is a descriptor relating to color gamut information, a descriptor_length indicating the length of the descriptor, and a data body of color gamut information Data () is described. Note that the value of descriptor_tag only needs to be able to specify that the description about color gamut information is included in the descriptor D23. For example, in ARIB STD-B10 that defines the standard for digital broadcasting, it indicates other descriptors. An unused value of “0xF0” may be used.

Here, in general, in television broadcasting, videos with different sources are transmitted continuously, and there is a possibility that videos of such different sources have different color gamuts. Therefore, in order to deal with such a case, the control information generation unit 18b updates the color gamut information in the EIT when the source changes, and also updates the EIT version information (value of the descriptor D21). To do. In the receiver 2b, the control information acquisition unit 32b checks the color gamut information every time the EIT version is updated, and if there is an update, transmits the new color gamut information to the color gamut conversion unit 26b. As a result, it is possible to express an appropriate color according to the change of the video.

In the EIT of FIG. 14A, the outer edge coordinates indicating the outer edge on the chromaticity space of the color gamut of the video of the received (reproduced) content are stored as data (). However, the color gamut information described in data () is information related to the color gamut of the received content, and can be used to determine whether or not color gamut conversion is necessary and to determine the mode of conversion when conversion is necessary. However, the present invention is not limited to this example. For example, the color gamut information may include at least one of the following information.
(1) Outer coordinates indicating the outer edge of the color gamut (the color gamut of the video of the received content) on the chromaticity space or chromaticity plane, and (2) the area occupied by the color gamut of the received content on the chromaticity plane; Area ratio information indicating a ratio of a predetermined color gamut to the area on the chromaticity plane as a comparison target with the color gamut (3) A color gamut of received content is a comparison target with the color gamut Information indicating the degree of going out of the predetermined color gamut (4) Corresponding format information (corresponding standard information) indicating the color gamut format (video standard) in which the color gamut including the color gamut of the received content is defined )
(5) Non-compliant format information (non-compliant standard information) indicating a gamut format (video standard) in which a gamut that does not include at least a part of the gamut of the received content is defined
As a specific example, the outer edge coordinates in (1) above are described in a format such as [(x, y, z), (x, y, z), ..., (x, y, z)]. The outermost coordinates of the color gamut represented on the chromaticity space or chromaticity plane may be used. The outer edge coordinates only need to include coordinates of at least three points.

Thereby, for example, it is possible to recognize that n% of protrusion occurs in the receiver 2b including the display 28b compliant with BT.709. Also, the conversion mode can be changed according to the magnitude of n. For example, when n is 30 to 50%, clipping is applied when the protruding portion is relatively small, and compression is applied when protruding portion is large, such as when n is 80% or more. It becomes possible. Note that n may be calculated by counting the number of pixels on the chromaticity plane. For example, n is calculated by the following equation: (the number of pixels outside the comparison color gamut among the pixels in the content color gamut) / (total number of pixels included in the content color gamut) × 100. Good.

FIG. 14B is a diagram showing another example of the descriptor D23 including the color gamut information in the EIT shown in FIG. In the example shown in FIG. 14B, “0x4E” indicating an extended event descriptor is described as the value of descriptor_tag in the descriptor D23. In the extended event descriptor, detailed information regarding the content is described as text. Therefore, as shown in FIG. 14B, the text indicating the color gamut information (information shown in the above (1) to (5)) may be described in the text_char in the descriptor D23. In the example shown in FIG. 14 (b), the text “BT.2020 80%” indicating the area ratio information shown in (2) is described, and the control information acquisition unit 32b analyzes the text. Get color gamut information. Note that if the text described in text_char is described with a predetermined hash tag such as “#”, for example, whether or not the text indicates color gamut information. Such a determination can be facilitated.

In this example, the text area of the extended event descriptor has been described. However, the text area of the short event descriptor descriptor_tag “0x4E” can be used in the same manner.

[Example of color gamut conversion using outer edge coordinates]
Next, for an example of color gamut conversion using outer edge coordinates (see (1) above) as the color gamut information, the color gamut conversion unit 26b performs the same processing as that described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using area ratio information]
Subsequently, for an example of color gamut conversion using area ratio information (see (2) above) as color gamut information, the color gamut conversion unit 26b performs the same processing as that described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using the ratio of the area of the protruding area]
Subsequently, for an example of color gamut conversion using information (see (3) above) indicating the ratio of the area of the protruding area as the color gamut information, the color gamut conversion unit 26b performs the processing described with reference to FIG. Similar processing is performed. Further, the same effect as described with reference to FIG.

[Supported format information / non-supported format information]
Next, for the corresponding format information (above (4)) and the non-corresponding format information (above (5)) which is one of the gamut information, the gamut conversion unit 26b performs the same process as described with reference to FIG. Perform the process. Further, the same effect as described with reference to FIG.

[Color Gamut Information Acquisition Processing]
Next, acquisition of color gamut information will be described with reference to FIG. FIG. 15 is a flowchart illustrating an example of processing for obtaining color gamut information executed by the receiver 2b. Here, an example (see FIG. 14A) in which the color gamut information is described in data () in the descriptor D23 will be described. First, the control information acquisition unit 32b extracts EIT from the signal output from the demultiplexing unit 23b, and further extracts a descriptor (descriptor) from the extracted EIT (S41).

Next, the control information acquisition unit 32b determines whether the extracted descriptor is a gamut information descriptor (S42). Specifically, when the descriptor_tag value of the extracted descriptor matches the tag value pre-assigned to the color gamut information, the control information acquisition unit 32b determines that the descriptor is the color gamut information descriptor. It is determined that

Here, when it is determined that the descriptor is not a gamut information descriptor (NO in S42), the control information acquisition unit 32b determines whether or not the following descriptor is included in the EIT (S43). If the control information acquisition unit 32b determines that it is included (YES in S43), it returns to the process of S41, extracts the next descriptor, and determines that it is not included (NO in S43). The process is terminated.

On the other hand, if it is determined in S42 that the descriptor extracted in S41 is a gamut information descriptor (YES in S42), the control information acquisition unit 32b analyzes the descriptor and includes the color included in the descriptor. Extract region information. Then, the extracted color gamut information is transmitted to the color gamut conversion unit 26b (S44), and the process ends.

If the color gamut information is described in text_char in the descriptor D23 (see FIG. 14B), in step S42, the control information acquisition unit 32b analyzes the extracted descriptor and The descriptor may be configured to determine whether text indicating color gamut information is included.

[Color Gamut Conversion Processing]
Next, color gamut conversion will be described with reference to FIG. FIG. 16 is a flowchart illustrating an example of color gamut conversion processing executed by the receiver 2b. This process is a process executed by the color gamut conversion unit 26b that has received the color gamut information transmitted in the process of S44 of FIG. Here, an example in which outer edge coordinates are received as color gamut information will be described.

First, the color gamut conversion unit 26b compares the color gamut of the received content video indicated by the received color gamut information with the color gamut of the display 28b (S50). Then, it is determined whether or not the color gamut of the video is larger, in other words, whether or not the color gamut of the video is within the color gamut of the display 28b (S51).

Here, when it is determined that the color gamut of the video is within the color gamut of the display 28b (NO in S51), the color gamut conversion unit 26b does not perform the color gamut conversion (S55) and ends the process. In this case, the received video of the content is displayed on the display 28b without being subjected to color gamut conversion. If NO is determined in S51, the color gamut conversion unit 26b may extend the color gamut of the video within a range that fits within the color gamut of the display 28b.

On the other hand, when it is determined that the color gamut of the video protrudes from the color gamut of the display 28b (YES in S51), the color gamut conversion unit 26b determines whether the color gamut of the video is 10% or more larger. (S52). In this determination, for example, on the chromaticity plane, the area of the image gamut calculated from the outer edge coordinates received as the gamut information is compared with the area of the gamut of the display 28b on the same chromaticity plane. Can be done.

When the color gamut conversion unit 26b determines that the color gamut of the video is 10% or more (YES in S52), the video gamut conversion unit 26b performs compression processing on the video so as to be within the color gamut of the display 28b. (S53). On the other hand, if it is determined that the color gamut difference is less than 10% (NO in S52), the video is subjected to clipping processing so that it falls within the color gamut of the display 28b (S54). Thus, the color gamut conversion process is completed.

In the above example, the criterion for determining whether to perform clipping processing or compression processing is based on whether or not the color gamut of the video is 10% or more larger than the color gamut of the display 28b. It is not limited to examples.

[Electronic program guide in receiver 2]
Next, the electronic program guide in the receiver 2b will be described with reference to FIG. FIG. 17 is a diagram illustrating an example of an electronic program guide generated by the OSD generation unit 33b of the receiver 2b with reference to an EIT including color gamut information. As shown in FIG. 17, in the electronic program guide generated by the OSD generation unit 33b, cells indicating each content are arranged on a two-dimensional plane spanned by an axis indicating the content channel and an axis indicating the time. . As shown in FIG. 17, when an operation for focusing on one of the cells of the electronic program guide is performed, information related to the content corresponding to the cell is displayed in close-up. Examples of the information related to the content include a program name, a broadcast time, a performer, and text indicating the content.

In the present embodiment, a configuration in which color gamut information is included in the EIT is adopted. Therefore, in this embodiment, the color gamut information of each content can be presented in the electronic program guide generated by the OSD generation unit 33b. As shown in FIG. 17, in addition to the program name, the broadcast time, the performers, and the text indicating the content of the content, the information related to each content is the text “BT.2020 情報 80% Is further presented.

In addition, it is good also as a structure which shows the color gamut information of each content to a user by changing the color of each cell in an electronic program guide according to the color gamut information contained in EIT.

[Embodiment 8: Modification]
The transmitter 1b of the above embodiment has both a function as a control information generating device that generates control information for reproducing content and a function as a transmitting device that transmits a digital broadcast signal. However, the function similar to the said transmitter 1b is realizable also with the combination of the control information generation apparatus and transmission apparatus which were mutually independent.

[Embodiment 9: Implementation by software]
Control blocks of transmitter 1b and receiver 2b (particularly control unit 15b, multiplexing unit 12b, encryption unit 13b, decryption unit 22b, demultiplexing unit 23b, color gamut conversion unit 26b, display control unit 27b, and control unit) 29b) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit).

In the latter case, the transmitter 1b and the receiver 2b include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read that records the above-described program and various data so that the computer (or CPU) can read them. Only Memory) or a storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A control information generation device (transmitter 1b) according to aspect 21 of the present invention is a control information generation device that generates control information for reproducing content transmitted in digital broadcasting, and the color gamut of the video of the content A color gamut information acquisition unit (17b) that acquires color gamut information relating to the color gamut, and a control information generation unit (18b) that generates an event information table including the color gamut information.

According to the above configuration, an event information table (EIT) including color gamut information is generated. Here, the EIT is added to a digital broadcast signal and transmitted, and is referred to when an electronic program guide is generated in the receiving apparatus. That is, according to the above configuration, the color gamut information of the content reproduced by the receiving device can be provided to the receiving device that has received the EIT prior to the reproduction of the content. Therefore, according to the above configuration, the receiving device that has received the EIT can adaptively convert the color gamut of the content in accordance with the color gamut information. Further, according to the above configuration, the receiving apparatus that has received the EIT can generate an electronic program guide including color gamut information of the content.

In the control information generation device according to aspect 22 of the present invention, in the aspect 21, the color gamut information includes outer edge coordinates indicating an outer edge of the color gamut of the content represented on a chromaticity space or a chromaticity plane. It may be.

According to the above configuration, the color gamut information includes the outer edge coordinates indicating the outer edge of the color gamut of the content represented on the chromaticity space or the chromaticity plane. Therefore, the receiving apparatus that has acquired the EIT can specify how wide the color gamut of the content is. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generation device according to aspect 23 of the present invention, in the

aspect

21 or 22, the color gamut information includes the area occupied by the color gamut of the content on the chromaticity plane as a comparison target with the color gamut. Area ratio information indicating a ratio of a predetermined color gamut to an area occupied on the chromaticity plane may be included.

According to the above configuration, in the color gamut information, the area occupied by the content color gamut on the chromaticity plane and the color gamut predetermined as a comparison target with the color gamut occupy on the chromaticity plane. Area ratio information indicating the ratio with the area is included. Therefore, the receiving apparatus that has acquired the EIT can specify how large or how small the color gamut of the content is compared with the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

Note that the color gamut to be compared is not limited as long as the color gamut can be recognized on the receiving device side. For example, the color gamut defined by the existing color gamut format (the color gamut defined by the existing video standard). There may be a color gamut set independently of the color gamut of the existing color gamut format.

In the control information generation device according to aspect 24 of the present invention, in any of the above aspects 21 to 23, the color gamut information includes a color gamut determined in advance as a comparison target with the color gamut. Information indicating the degree of going out of the area may be included.

According to the above configuration, the color gamut information includes information indicating the degree to which the color gamut of the content is outside the color gamut predetermined as a comparison target with the color gamut. Therefore, the receiving apparatus that has acquired the EIT can specify how far the color gamut of the content protrudes from the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the control information generation device according to aspect 25 of the present invention, in any of the above aspects 21 to 24, the color gamut information includes a corresponding standard indicating a video standard in which a color gamut including the color gamut of the content is defined. Information (corresponding format information) may be included.

According to the above configuration, the color gamut information includes the corresponding standard information indicating the video standard in which the color gamut including the color gamut of the content is defined. Therefore, the receiving device that has acquired the EIT determines that the display for displaying the content can be displayed without converting the color gamut of the content if the display conforms to the video standard. Can do. On the other hand, if the display for displaying the content does not conform to the video standard or conforms to a video standard having a narrower color gamut than the video standard, it is necessary to convert the color gamut of the content. It can be determined that there is. Therefore, according to said structure, according to the display which displays a content, the said color gamut of the said content can be displayed appropriately, without converting.

In the control information generation device according to aspect 26 of the present invention, in any of the above aspects 21 to 25, the color gamut information includes a video standard in which a color gamut that does not include at least a part of the color gamut of the content is defined. Non-compliant standard information (non-compliant format information) may be included.

According to the above configuration, the color gamut information includes non-compliant standard information indicating a video standard in which a color gamut that does not include at least a part of the color gamut of the content is included. Therefore, the receiving device that has acquired the EIT, when the display for displaying the content conforms to the video standard, or conforms to a video standard having a narrower color gamut than the video standard, It can be determined that the color gamut of the image needs to be converted. Therefore, according to said structure, according to the display which displays a content, the color gamut of the said content can be converted appropriately and this content can be displayed appropriately.

A transmitting apparatus (transmitter 1b) according to aspect 27 of the present invention provides a control information generation apparatus according to any one of aspects 21 to 26 and an event information table generated by the control information generation apparatus as a digital broadcast signal together with the content. A transmission unit 14b for transmission.

According to the above configuration, the event information table generated by the control information generation device is added to the digital broadcast signal and transmitted. The receiving device refers to the event information table when generating the electronic program guide. That is, according to the above configuration, the color gamut information of the content reproduced by the receiving device can be provided to the receiving device prior to the reproduction of the content. Therefore, it is possible to cause the receiving device that has received the digital broadcast signal to reproduce the content after adaptively converting the color gamut of the content according to the color gamut information included in the event information table. .

The receiving device (receiver 2b) according to the aspect 28 of the present invention is a receiving device that receives content transmitted in digital broadcasting, and acquires an event information table including color gamut information related to the color gamut of the video of the content. A control information acquisition unit (32b) that performs the conversion, and a color gamut conversion unit (26b) that converts the color gamut of the content video according to the color gamut information.

According to the above configuration, the event information table including the color gamut information related to the color gamut of the content video is acquired prior to the reproduction of the content, and the color gamut of the content video is determined according to the color gamut information. Convert. Therefore, according to the above configuration, the content can be reproduced after adaptively converting the color gamut of the content according to the color gamut information. Moreover, according to said structure, the electronic program guide containing the color gamut information of the said content can be produced | generated.

In the reception device according to aspect 29 of the present invention, in the aspect 28, the color gamut information is described as text in the event information table, and a program table (EPG) including text indicating the color gamut information is included. A program guide generating unit (OSD generating unit 33b) for generating the program guide, and a display control unit (27b) for displaying the program guide generated by the program guide generating unit on the display unit (display 28b). Good.

According to the above configuration, the color gamut information can be included in the electronic program guide generated by the receiving device with reference to the event information table. In particular, in the above configuration, the text indicating the color gamut information can be included in the program table as it is, so that the color gamut information of each content can be presented in an easy-to-understand manner for the user.

A television receiver according to aspect 30 of the present invention includes the receiving device according to

aspect

28 or 29 described above. Therefore, the same function and effect as those of the receiving apparatus according to aspect 28 are obtained.

A video signal transmission system 5 according to an aspect 31 of the present invention is a video signal transmission system including a transmission device (transmitter 1b) that transmits content in digital broadcasting and a reception device (receiver 2b) that receives the content. The transmission device adds an event information table including color gamut information indicating the color gamut of the video of the content to the digital broadcast signal and transmits the event information table to the reception device, and the reception device receives the digital broadcast signal from the digital broadcast signal. An event information table is acquired, and the color gamut of the content video is converted according to the color gamut information. Therefore, the same operation and effect as the control information generation device of aspect 21 and the reception device of aspect 28 are achieved.

The control information generation device, the transmission device, and the reception device according to each aspect of the present invention may be realized by a computer. In this case, each unit included in the control information generation device, the transmission device, or the reception device. The control information generation device, the transmission device, or the reception device that is realized as a computer by operating as a computer, and a computer-readable recording medium that records the control program also fall within the scope of the present invention.
[Explanation of Related Embodiment III]
Embodiments 10 to 13 will be described below.

[Background Technology of Embodiments 10 to 13]
As part of the advancement of broadcasting, video signals capable of reproducing a wider color gamut than before have been proposed. Specifically, the ITU-R BT.2020 (hereinafter referred to as BT.2020) established by the International Telecommunications Union is based on the conventional ITU-R BT.709 (hereinafter referred to as BT.709). It has become possible to express a significantly wider color gamut. Then, in 2014, 4K test broadcasting using this standard was started, and it is expected that 4K / 8K broadcasting will be used mainly in the future.

[Problems to be solved by the inventions of Embodiments 10 to 13]
Here, when the playback target is something like broadcast content that changes every moment, it is necessary to adaptively change the color gamut conversion processing in accordance with the content that changes every moment. However, the conventional technology has a problem that the color gamut conversion process cannot be adaptively changed in accordance with the changing contents. For example, even after the playback target is switched, the same color gamut conversion processing as that before switching is applied, and as a result, there is a problem that the color of the playback target changes unnaturally.

In addition, recently, a receiver that can receive broadcasts (such as a television receiver) that is compatible with a service (for example, hybrid cast) that uses two communication paths, a broadcast path and a communication path, is also commercially available. It is like that. However, conventionally, the characteristic that a receiving device that supports network communication can reproduce content using information acquired via a communication path has not been used for adaptive conversion of the color gamut. It wasn't.

The present invention has been made in view of the above-described problems, and an object of the present invention is to adaptively convert the color gamut of content to a receiving apparatus that supports a service that uses both a broadcast path and a communication path. An object of the present invention is to provide a transmission device and the like that can be used.

[Effects of Inventions According to Embodiments 10 to 13]
According to the inventions according to the tenth to thirteenth embodiments, it is possible to adaptively convert the color gamut of the video according to the content to be reproduced, by a receiving apparatus that supports a service that uses both a broadcast path and a communication path. There is an effect.

[Mode for Carrying Out the Invention]
[Embodiment 10]
Hereinafter, a tenth embodiment of the present invention will be described in detail with reference to FIGS. First, the configuration of the video signal transmission system according to the present embodiment will be described with reference to FIG. FIG. 18 is a block diagram illustrating an example of a main configuration of a transmitter (transmission device, control information generation device) 1c included in the video signal transmission system 5c.

The video signal transmission system 5c is a system for transmitting a video signal and the like from the transmitter 1c to the receiver (receiving device) 2c. The video signal transmission system 5c is mainly characterized in that the color gamut information indicating the color gamut of the video to be transmitted is acquired by the receiver 2c via the communication path, and thereby the optimum color corresponding to the video is obtained. It is possible to perform area conversion. In the next-generation 4K / 8K broadcasting, it is considered that signals are transmitted in the MMT (MPEG Media Transport) format. Therefore, in this embodiment, an example in which a video signal is transmitted in the MMT format will be described.

The transmitter 1c transmits content in the form of a video signal or the like. More specifically, the transmitter 1c transmits each packet (MMTP packet: MMT Protocol packet) constituting the content through a broadcast path (broadcast transmission path). One receiver 2c has a function of receiving this content (content distributed through a broadcast path) and also has a function of receiving content distributed through a communication path via a communication network such as the Internet. . And the receiver 2c can reproduce | regenerate combining each content received via these two paths | routes. In the figure, only one receiver 2c is shown, but the transmitter 1c broadcasts content to a plurality of receivers 2c.

[Configuration of transmitter]
As illustrated, the transmitter 1c includes an audio encoder 10c, a video encoder 11c, a multiplexing unit 12c, an encryption unit 13c, a transmission unit (control information transmission unit) 14c, a control unit 15c, and a communication I / F 16c. Yes. The control unit 15c includes an encoding control unit 151c, a color gamut information acquisition unit 152c, a color gamut information notification unit (color gamut information transmission unit) 153c, and a control information generation unit 154c.

The audio encoder 10 c encodes (encodes) the audio (sound) stream of the content transmitted by the transmitter 1 c and outputs it to the multiplexing unit 12. Similarly, the video encoder 11c encodes (encodes) a video (video) stream of content transmitted by the transmitter 1c and outputs the encoded video (video) stream to the multiplexing unit 12c.

The multiplexing unit 12c multiplexes the audio stream output from the audio encoder 10c, the video stream output from the video encoder 11c, and the control information output from the control unit 15c, and outputs the multiplexed information to the encryption unit 13c.

The encryption unit 13c encrypts the multiplexed stream output from the multiplexing unit 12c and outputs the encrypted stream to the transmission unit 14c. Then, the transmission unit 14c transmits the encrypted data output from the encryption unit 13c as a packet to the receiver 2c through the broadcast path in the form of a digital broadcast signal.

The control unit 15c controls each unit included in the transmitter 1c. Specifically, the encoding control unit 151c included in the control unit 15c controls the audio encoder 10c and the video encoder 11c to perform encoding.

The color gamut information acquisition unit 152c acquires color gamut information, which is information related to the color gamut of the content transmitted by the transmitter 1c, and outputs the acquired color gamut information to the color gamut information notification unit 153c. The method for obtaining the color gamut information is not particularly limited. For example, the color gamut of the content obtained by the shooting is determined from the model of the camera used for shooting, so the color gamut information is obtained from the information of the camera used for shooting. You may get it. Further, when video processing is performed on the content, the color gamut of the content may be specified depending on the equipment used for the video processing. In this case, the color gamut information may be acquired from the information on the equipment used for the video processing. In addition to this, for example, the color gamut information may be acquired by performing video analysis of the content at an arbitrary timing such as the time of editing. Details of the color gamut information will be described later.

The color gamut information notification unit 153c notifies the receiver 2c of the color gamut information acquired by the color gamut information acquisition unit 152c. Specifically, the color gamut information notification unit 153c transmits color gamut information to the receiver 2c via the communication I / F 16c in response to a request from the receiver 2c.

The control information generation unit 154c generates control information for reproducing the content transmitted by the transmitter 1c. This control information is called MMT-SI in MMT, and includes various pieces of information related to content. Here, of MMT-SI, the control information is related to a program (software) executed during output of content video. The description will focus on the generation of AIT (Application Information Table) in which information is described.

In addition, in ARIB STD-B60, which defines the media transport system by MMT, AIT called MH-AIT (Application Information Table) is defined in distinction from AIT of TS system. TS format AIT and NH-AIT differ only in whether the descriptor_tag is 8 bits or 16 bits. The term “AIT” in this specification includes “TS format Both “AIT” and “MH-AIT” are included.

As described above, in the transmitter 1c, the color gamut information acquisition unit 152c executes the process of acquiring the color gamut information (color gamut information acquisition step), and the control information generation unit 154c performs control for acquiring the color gamut information. A process (control information generation step) for generating information (AIT) is executed. Then, the transmission unit 14c executes a process (control information transmission step) for transmitting the control information to the receiver 2c, and sends a gamut information notification unit to the receiver 2c that requests transmission of the gamut information according to the control information. 153c executes a process (color gamut information transmission step) for transmitting the color gamut information through the communication path.

Therefore, in the receiver 2c that has received this AIT, it is possible to display the content received together with the AIT with appropriate conversion according to the color gamut information (or without conversion).

When the content transmitted by the transmitter 1c is switched, the color gamut information acquisition unit 152c acquires the color gamut information of the content after switching, and the color gamut information notification unit 153c transmits the newly acquired color gamut information. To do. In this way, by transmitting different color gamut information following the change in the content, it is possible to always reproduce the content by optimal conversion. Note that, as in the above example, the gamut information to be transmitted may be switched without rewriting the AIT, and the gamut information after the change is acquired along with the change of the gamut information to be transmitted. The AIT may be rewritten.

[Configuration of receiver]
Next, the configuration of the receiver 2c will be described with reference to FIG. FIG. 19 is a block diagram illustrating an example of a main configuration of the receiver 2c. The receiver 2c includes a tuner 20c, a communication I / F 21c, a decoding unit 22c, a demultiplexing unit 23c, an audio decoder 24c, a video decoder 25c, a color gamut conversion unit 26c, a display control unit 27c, a display 28c, as illustrated. An input unit 29c and a control unit 30c are provided. The control unit 30c includes a decoding control unit 301c, a demultiplexing control unit 302c, a control information acquisition unit 303c, an application control unit 304c, a color gamut information acquisition unit 305c, and a color gamut adjustment unit 306c.

The tuner 20c receives the content transmitted as a digital broadcast signal through the broadcast path, and outputs it to the decoding unit 22c. On the other hand, the communication I / F 21c receives the content transmitted through the communication path and outputs it to the decoding unit 22c. That is, the receiver 2c is a receiving device that supports a service that uses both a broadcast path and a communication path. Although details will be described later, the color gamut information is acquired through the communication I / F 21c.

When the content received via the tuner 20c and the communication I / F 21c is encrypted, the decryption unit 22c decrypts the content and outputs it to the demultiplexing unit 23c.

The demultiplexing unit 23c demultiplexes the data output from the decryption unit 22c (encrypted but decrypted). Then, each component (component) of the content obtained by demultiplexing is processed according to the type of the component. Specifically, the demultiplexing unit 23c outputs audio components to the audio decoder 24c, outputs video components to the video decoder 25c, and outputs control information to the control information acquisition unit 303c.

The audio decoder 24c decodes the audio component output from the demultiplexing unit 23c and outputs audio data. Similarly, the video decoder 25c decodes the video component output from the demultiplexer 23c and outputs video data.

The color gamut conversion unit 26c determines the necessity of color gamut conversion based on the color gamut information. When conversion is necessary, the method is also determined, and the color gamut of the video data output from the video decoder 25c is converted by the determined method. By this conversion, the color gamut of the video data output from the video decoder 25c falls within the range of the color gamut that can be displayed on the display 28c. For example, when it is determined from the color gamut information that the color gamut of the video data to be reproduced is within the reproducible color gamut of the display 28c, it is determined not to convert. On the other hand, when it is determined that it is outside the reproducible color gamut of the display 28c, appropriate conversion is performed in accordance with the ratio existing outside. Note that the color gamut conversion unit 26c may be provided in the control unit 30c.

The display control unit 27c performs control to display the video data on the display 28c. The display 28c displays video data according to the control of the display control unit 27c. That is, the receiver 2c is a television receiver having a function for receiving and reproducing (displaying) broadcast content. The display 28c may be an external device externally attached to the receiver 2c.

The input unit 29c is an input device that receives a user operation on the receiver 2c and notifies the control unit 30c of the contents of the operation. The input unit 29c may be a receiving unit that receives a signal indicating the content of a user operation, which is transmitted, for example, by infrared rays.

The control unit 30c controls each unit included in the receiver 2c according to the received control information. Specifically, the decryption control unit 301c controls the decryption unit 22c to decrypt the content. Also, the demultiplexing control unit 302c controls the demultiplexing unit 23c to perform demultiplexing of content.

The control information acquisition unit 303c acquires control information output by the demultiplexing unit 23c demultiplexing, and outputs an application control signal included in the control information to the application control unit 304c. Then, the application control unit 304c controls the operation of various application software (hereinafter referred to as an application) in accordance with the application control signal output by the control information acquisition unit 303c. Specifically, the application control unit 304c performs control to activate the color gamut information acquisition unit 305c and the color gamut adjustment unit 306c and to terminate activation.

The functions of the color gamut information acquisition unit 305c and the color gamut adjustment unit 306c are realized by an application. The color gamut information acquisition unit 305c acquires color gamut information from the transmitter 1c via the communication I / F 21c and transmits the color gamut information to the color gamut adjustment unit 306c or the color gamut conversion unit 26c. The color gamut adjustment unit 306c receives a user operation for adjusting the color gamut, and notifies the color gamut conversion unit 26c of a color gamut adjustment method according to the user operation.

[Obtain application control signals and color gamut information]
Next, the acquisition of the application control signal and the color gamut information will be described with reference to FIG. FIG. 20 takes as an example a hybrid cast service realized as a service using both a broadcast path and a communication path, and shows an application control signal (AIT) transmitted together with a broadcast signal and an application activation example according to the AIT. FIG.

(A) of the figure shows an example in which one application (color gamut information acquisition unit 305c) is started according to the AIT. As illustrated, the AIT is transmitted together with the transmission signal (broadcast signal), and the AIT of the service is periodically transmitted while the tuning of the same service is maintained.

Here, the AIT transmitted by the transmitter 1c includes a description indicating that the color gamut information acquisition unit 305c is automatically activated, and the receiver 2c that has received the AIT receives the color gamut information according to this description. The acquisition unit 305c is activated. When the activated color gamut information acquisition unit 305c acquires the color gamut information, the activation of the color gamut information acquisition unit 305c is terminated. The acquisition destination of the color gamut information may be described in the AIT in a format such as URL (Uniform Resource Locator).

On the other hand, (b) of the figure shows an example in which two applications (color gamut information acquisition unit 305c and color gamut adjustment unit 306c) are activated in accordance with AIT. Also in this example, the AIT transmitted by the transmitter 1c includes a description indicating that the color gamut information acquisition unit 305c is automatically activated, and the receiver 2c that has received this AIT receives the color according to this description. The area information acquisition unit 305c is activated.

In this example, another application (app2 corresponding to the color gamut adjustment unit 306c) is described in the AIT. When the activated color gamut information acquisition unit 305c acquires color gamut information and performs a predetermined user operation, the color gamut adjustment unit 306c is activated instead of the color gamut information acquisition unit 305c (app1) according to the AIT. When the activated color gamut adjustment unit 306c receives a user operation for adjusting the color gamut and determines a color gamut adjustment method according to the user operation, the color gamut information acquisition unit 305c and the color gamut adjustment unit The activation of 306c is terminated.

Here, in general, in television broadcasting, videos with different sources are transmitted continuously, and there is a possibility that videos of such different sources have different color gamuts. Therefore, in order to deal with such a case, the color gamut information notification unit 153c of the transmitter 1c updates the color gamut information to be notified to one corresponding to a new source. Then, the application control unit 304c of the receiver 2c activates the color gamut information acquisition unit 305c periodically (for example, when a new AIT is received or when the version of the AIT changes), and again the color gamut information To get. As a result, it is possible to express an appropriate color according to the change of the video.

[Synchronize with content]
As described above, the transmitter 1c transmits the content through the broadcast path and transmits the color gamut information of the content through the communication path. Then, the receiver 2c converts the color gamut of the content to be reproduced according to the color gamut information received through the communication path while reproducing the content transmitted through the broadcast path. As described above, when the color gamut information is transmitted through a route different from the content, a mechanism for changing the color gamut information to be applied in synchronization with the switching of the color gamut of the content with high accuracy is required.

For example, as shown in FIG. 21, the color gamut to be applied at the timing when the color gamut of the content is switched by transmitting to the receiver 2c timing designation information specifying the timing at which the color gamut changes by the system clock (STC). Information can be changed. FIG. 21 is a diagram illustrating an example of timing designation information and a change in color gamut according to the timing designation information. The system clock is time information used to synchronize video, audio, subtitles, and the like in content distribution on a broadcast route or a communication route.

In the example of FIG. 21, the color gamut of the content at the timing of becoming STC (1) is the color gamut (1). When this becomes STC (2), the color gamut (2) is reached, and when it becomes STC (3), the color gamut. It has switched to (3). Such a change in the color gamut can be expressed as timing designation information in which the STC is associated with the color gamut at that time (color gamut information), for example, as shown in the upper left of FIG.

Such timing designation information is acquired in advance based on the broadcast schedule of the content, the advertising content broadcast in the middle of the content, etc., the timing when the color gamut changes and what color gamut will be after the change. It can be generated by

Then, in the receiver 2c that has received such timing designation information, the color gamut information acquisition unit 305c sends the color gamut information associated with the timing to the color gamut conversion unit 26c at the timing indicated by the timing designation information. Notice. This makes it possible to apply different color gamut conversion at the timing indicated by the timing designation information.

Note that the color gamut information acquisition unit 305c may transmit the color gamut information to the color gamut adjustment unit 306c. In this case, the color gamut adjustment unit 306c determines a color gamut adjustment method according to a user operation. Then, the determined adjustment method is notified to the color gamut conversion unit 26c.

However, if the user adjusts the color gamut when switching to content with a relatively short broadcast time, such as advertising content, the user may feel annoyed. For this reason, when the broadcast time of the content after switching is less than or equal to a predetermined time (for example, 5 minutes), the color gamut is automatically adjusted based on the acquired color gamut information. It may be adjusted.

[About color gamut information]
The color gamut information is information regarding the color gamut of the received content, and may be any information that can be used to determine whether or not color gamut conversion is necessary and to determine a conversion mode when conversion is necessary. For example, the color gamut information may include at least one of the following information.
(1) Outer coordinates indicating the outer edge of the color gamut (the color gamut of the video of the received content) on the chromaticity space or chromaticity plane, and (2) the area occupied by the color gamut of the received content on the chromaticity plane; Area ratio information indicating a ratio of a predetermined color gamut to the area on the chromaticity plane as a comparison target with the color gamut (3) A color gamut of received content is a comparison target with the color gamut Information indicating the degree of going out of the predetermined color gamut (4) Corresponding format information (corresponding standard information) indicating the color gamut format (video standard) in which the color gamut including the color gamut of the received content is defined )
(5) Non-compliant format information (non-compliant standard information) indicating a gamut format (video standard) in which a gamut that does not include at least a part of the gamut of the received content is defined
As a specific example, the outer edge coordinates in (1) above are described in a format such as [(x, y, z), (x, y, z), ..., (x, y, z)]. The outermost coordinates of the color gamut represented on the chromaticity space or chromaticity plane may be used. The outer edge coordinates only need to include coordinates of at least three points.

Thereby, for example, it is possible to recognize that n% of protrusion occurs in the receiver 2c including the display 28c compliant with BT.709. Also, the conversion mode can be changed according to the magnitude of n. For example, when n is 30 to 50%, clipping is applied when the protruding portion is relatively small, and compression is applied when protruding portion is large, such as when n is 80% or more. It becomes possible. Note that n may be calculated by counting the number of pixels on the chromaticity plane. For example, n is calculated by the following equation: (the number of pixels outside the comparison color gamut among the pixels in the content color gamut) / (total number of pixels included in the content color gamut) × 100. Good.

[Example of color gamut conversion using outer edge coordinates]
Next, for an example of color gamut conversion using outer edge coordinates (see (1) above) as color gamut information, the color gamut conversion unit 26c performs the same processing as the processing described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using area ratio information]
Subsequently, for an example of color gamut conversion using area ratio information (see (2) above) as color gamut information, the color gamut conversion unit 26c performs the same process as described with reference to FIG. Further, the same effect as described with reference to FIG.

[Example of color gamut conversion using the ratio of the area of the protruding area]
Subsequently, for an example of color gamut conversion using information (see (3) above) indicating the ratio of the area of the protruding area as the color gamut information, the color gamut conversion unit 26c performs the processing described with reference to FIG. Similar processing is performed. Further, the same effect as described with reference to FIG.

[Supported format information / non-supported format information]
Next, for the corresponding format information (above (4)) and the non-corresponding format information (above (5)), which is one of the gamut information, the gamut converting unit 26c is the same as the processing described with reference to FIG. Perform the process. Further, the same effect as described with reference to FIG.

[Color Gamut Information Acquisition Processing]
Next, acquisition of color gamut information will be described with reference to FIG. FIG. 22 is a flowchart illustrating an example of processing for acquiring color gamut information executed by the receiver 2. Here, an example will be described in which the color gamut is not automatically adjusted based on a user operation and the receiver 2c automatically converts the color gamut.

First, the control information acquisition unit 303c extracts the AIT from the signal output from the demultiplexing unit 23c and outputs the AIT to the application control unit 304c. The application control unit 304c activates the color gamut information acquisition unit 305 according to the AIT ( S61).

Next, the activated color gamut information acquisition unit 305c acquires color gamut information from a predetermined acquisition destination (in this example, the transmitter 1) indicated by the AIT via a communication path (S62). Further, the color gamut information acquisition unit 305c transmits the acquired color gamut information to the color gamut conversion unit 26c (S63), and notifies the application control unit 304c to that effect. Then, the application control unit 304c ends activation of the color gamut information acquisition unit 305c (S64), and the color gamut information acquisition processing is thereby ended.

[Color Gamut Conversion Processing]
Next, color gamut conversion will be described with reference to FIG. FIG. 23 is a flowchart illustrating an example of color gamut conversion processing executed by the receiver 2c. This process is a process executed by the color gamut conversion unit 26c that has received the color gamut information transmitted in the process of S63 in FIG. Here, an example in which outer edge coordinates are received as color gamut information will be described.

First, the color gamut conversion unit 26c compares the color gamut of the received content video indicated by the received color gamut information with the color gamut of the display 28c (S70). Then, it is determined whether or not the color gamut of the video is larger, in other words, whether or not the color gamut of the video is within the color gamut of the display 28c (S71).

Here, when it is determined that the color gamut of the video is within the color gamut of the display 28c (NO in S71), the color gamut conversion unit 26c does not perform the color gamut conversion (S75) and ends the processing. In this case, the received video of the content is displayed on the display 28c without color gamut conversion. If NO is determined in S71, the color gamut conversion unit 26c may extend the color gamut of the video within a range that fits within the color gamut of the display 28c.

On the other hand, if it is determined that the color gamut of the video protrudes from the color gamut of the display 28c (YES in S71), the color gamut conversion unit 26c determines whether the color gamut of the video is 10% or more larger. (S72). In this determination, for example, on the chromaticity plane, the area of the image gamut calculated from the outer edge coordinates received as the gamut information is compared with the area of the gamut of the display 28c on the same chromaticity plane. Can be done.

If the color gamut conversion unit 26c determines that the color gamut of the video is 10% or more (YES in S72), the video gamut conversion unit 26c performs compression processing on the video so as to be within the color gamut of the display 28c. (S73). On the other hand, if it is determined that the color gamut difference is less than 10% (NO in S72), the video is subjected to clipping processing so that it falls within the color gamut of the display 28c (S74). Thus, the color gamut conversion process is completed.

In the above example, the criterion for determining whether to perform clipping processing or compression processing is based on whether the color gamut of the video is 10% or more larger than the color gamut of the display 28c. It is not limited to examples.

[Color gamut conversion using conversion table]
In the above example, the color gamut conversion unit 26c uses the color gamut information to determine the color gamut conversion according to the color gamut information. However, the color gamut conversion unit 26c is applied by referring to the conversion table indicating the content of the color gamut conversion. The color gamut conversion to be performed may be determined. This will be described with reference to FIG. FIG. 24 is a diagram illustrating color gamut conversion using a conversion table.

The conversion table (color gamut conversion information) T shown in the figure shows an example of a conversion table for converting the BT.2020 color gamut into the BT.709 color gamut. This conversion table T is a look-up table in which converted values are shown for each of 256 × 256 = 65536 elements included in the color gamut of BT.2020.

In addition to the conversion table T for BT.2020 color gamut conversion, the conversion table management server 6 is compatible with the receiver 2c having various display characteristics (more specifically, the color gamut of the display 28). Multiple types of conversion tables are stored. For example, the conversion table management server 6 includes a conversion table for converting the BT.2020 color gamut to the AdobeRGB color gamut, the BT.2020 color gamut to the panel A color gamut (a predetermined color set by the user uniquely). A conversion table or the like for conversion into (region) may be stored. Then, the receiver 2c may convert the color gamut of the content to be reproduced using a conversion table corresponding to the color gamut that can be displayed on the display 28c. For example, when the display 28 conforms to BT.709 and the color gamut of the content to be played is BT.2020, a conversion table for converting the BT.2020 color gamut into the BT.709 color gamut can be used. That's fine.

In the receiver 2c that has received such a conversion table, the color gamut information acquisition unit 305c transmits the conversion table to the color gamut conversion unit 26c, and the color gamut conversion unit 26c uses this conversion table to determine the color gamut of the video. Convert. Note that the color gamut information acquisition unit 305c may acquire one conversion table corresponding to the display 28c, or may acquire a plurality of conversion tables. When a plurality of conversion tables are acquired, a conversion table corresponding to the color gamut of the display 28c is extracted from them and transmitted to the color gamut conversion unit 26c. Even when the conversion table is acquired, the color gamut information as described in (1) to (5) above may be acquired together. As a result, when the conversion using the conversion table is not in accordance with the user's will, other conversions can be performed.

[Color gamut adjustment by user operation]
Next, color gamut adjustment by a user operation will be described with reference to FIGS. FIG. 25 is a diagram illustrating an example of a color gamut adjustment screen displayed on the display 28c on the receiver 2c for color gamut adjustment. FIG. 26 illustrates the receiver 2c when accepting color gamut adjustment by a user operation. It is a flowchart which shows an example of the process performed by.

[Screen example for color gamut adjustment]
In the screen example of FIG. 25A, a window A1 for allowing the user to select whether or not color gamut adjustment is necessary is displayed superimposed on the content video. More specifically, this window A1 includes a message for inquiring the user whether or not color gamut adjustment is necessary, a selection item “Yes” for selecting to adjust the color gamut, and a selection for selecting not to adjust. The item “No” is displayed. A selection item “X” for closing the window A1 is displayed in the upper right corner of the window A1.

When “Yes” is selected from this window A1, a transition is made to the color gamut adjustment screen shown in FIG. On this color gamut adjustment screen, a window A2 for allowing the user to perform color gamut adjustment is displayed superimposed on the content video. More specifically, in this window A2, panel color gamut information B1 indicating the color gamut of the panel (display 28) and video color gamut information B2 indicating the color gamut of the content video are displayed. The window A2 includes post-conversion color gamut information B3 indicating the post-conversion color gamut, a color gamut reduction key B4 for narrowing the color gamut, and a color gamut expansion key B5 for widening the color gamut. It is also displayed. A selection item (X) for closing the window A2 is displayed in the upper right corner of the window A2.

The user who performs the color gamut adjustment refers to the panel color gamut information B1 and the video color gamut information B2 in the window A2 to determine how much the color gamut of the display 28c is insufficient with respect to the video color gamut. Alternatively, it can be easily recognized how much room is available.

Then, when the color gamut of the display 28c is narrower than the color gamut of the video, the user operates the color gamut reduction key B4. As a result, a process for reducing the color gamut (for example, compression) is performed, and the result of this process is reflected in the post-conversion color gamut information B3, and the color gamut indicated by the post-conversion color gamut information B3 becomes narrow.

On the other hand, when the color gamut of the display 28c is wider than the video color gamut, the user operates the color gamut expansion key B5. As a result, processing for extending the color gamut is performed, and the result of this processing is reflected in the post-conversion color gamut information B3, so that the color gamut indicated by the post-conversion color gamut information B3 is widened.

[Flow of processing when the user performs color gamut adjustment]
When the user performs color gamut adjustment, in addition to the color gamut information acquisition unit 305c, the color gamut adjustment unit 306c is activated, and a user operation is accepted by the color gamut adjustment unit 306c. Therefore, when a user operation for color gamut adjustment is accepted, a description for starting the color gamut adjustment unit 306c is included in the AIT.

First, the control information acquisition unit 303c extracts the AIT from the signal output from the demultiplexing unit 23c and outputs the AIT to the application control unit 304c. The application control unit 304c activates the color gamut information acquisition unit 305c according to the AIT ( S80). Then, the activated color gamut information acquisition unit 305c acquires color gamut information (S81).

In addition, the application control unit 304c activates the color gamut adjustment unit 306c according to the AIT (S82), instructs the color gamut information acquisition unit 305c to cause the color gamut adjustment unit 306c to transmit the color gamut information. Then, the color gamut adjustment unit 306c that has received the color gamut information displays a screen as shown in FIG. 25A on the display 28c, for example, and allows the user to select whether or not color gamut adjustment is necessary. Note that, when selection is made that the color gamut adjustment is not possible, the color gamut information is transmitted to the color gamut conversion unit 26c to convert the color gamut.

Here, when the selection that the color gamut adjustment is necessary is made, the color gamut adjustment unit 306c displays, for example, a screen as shown in FIG. Is accepted (S83).

The color gamut adjustment unit 306c notifies the color gamut conversion unit 26c of an adjustment method according to the received user operation (S84), and notifies the application control unit 304c accordingly. The application control unit 304c ends activation of the color gamut adjustment unit 306c (S85), and also ends activation of the color gamut information acquisition unit 305c (S86), thereby ending the processing.

[Embodiment 11]
An eleventh embodiment of the present invention will be described with reference to FIGS. In addition, the same reference number is attached | subjected to the structure similar to the said embodiment, and the description is abbreviate | omitted. First, an outline of the video signal transmission system 500 of this embodiment will be described with reference to FIG. FIG. 27 is a diagram showing a schematic configuration of the video signal transmission system 500.

As shown in the figure, the video signal transmission system 500 includes a transmitter 100, a receiver 200, a color gamut information management server 300, and a terminal device (transmission device) 400. The video signal transmission system 500 is a system for transmitting a video signal and the like from the transmitter 100 to the receiver 200 as in the video signal transmission system 5 of the above embodiment.

In the video signal transmission system 500, the terminal device 400 acquires the color gamut information from the color gamut information management server 300, and receives the acquired color gamut information (or the color gamut adjustment method determined based on the color gamut information). To the machine 200. Note that the color gamut information management server 300 is a server that manages color gamut information of each content to be broadcast, and obtains color gamut information corresponding to the content by accessing the server and notifying the content. Can do. The video signal transmission system 500 can adaptively convert the color gamut of the content through such processing.

[Configuration of receiver and terminal device]
Next, the configuration of the receiver 200 and the terminal device 400 will be described with reference to FIG. FIG. 28 is a block diagram illustrating an example of a main configuration of the receiver 200 and the terminal device 400. The receiver 200 has substantially the same configuration as the receiver 2c in FIG. 19, but does not have a function of acquiring color gamut information from the AIT, and the color gamut information acquisition unit 305c receives color gamut information or It differs in that it obtains the color gamut adjustment method. In FIG. 28, only the color gamut information acquisition unit 305c is illustrated as a block in the control unit 30c, but the decoding control unit 301c, the demultiplexing control unit 302c, and the like of FIG. 19 are also included in the control unit 30c.

The terminal device 400 is used by a user of the receiver 200 and is a terminal device having a communication function with the receiver 200 and the color gamut information management server 300. The terminal device 400 may be a general-purpose terminal device such as a smartphone or a tablet terminal. As illustrated, the terminal device 400 includes a communication I / F 40, a control unit 41, a display unit 42, and an input unit 43.

The communication I / F 40 is for the terminal device 400 to communicate with an external device, specifically, the receiver 200 and the color gamut information management server 300 through a communication path. The communication I / F 40 may be a device that performs communication via a communication network such as the Internet. Note that a communication I / F for communicating with the receiver 200 and a communication I / F for communicating with the color gamut information management server 300 may be provided separately.

The control unit 41 controls and controls each unit of the terminal device 400, and includes a color gamut information acquisition unit 411, a color gamut information notification unit (color gamut information transmission unit) 412, and a color gamut adjustment unit 413.

The color gamut information acquisition unit 411 acquires color gamut information. Specifically, the color gamut information acquisition unit 411 acquires from the color gamut information management server 300 the color gamut information of the content specified by the user (the content being broadcast and received by the receiver 200). Then, the color gamut information acquisition unit 411 transmits the acquired color gamut information to the color gamut adjustment unit 413. Note that the terminal device 400 may be configured not to adjust the color gamut. In this case, the color gamut adjustment unit 413 transmits the acquired color gamut information to the color gamut information notification unit 412, The color gamut information notification unit 412 transmits this color gamut information to the receiver 200.

The color gamut information notification unit 412 notifies the receiver 200 of the color gamut adjustment method determined by the color gamut adjustment unit 413 through the communication path (via the communication I / F 40). As described above, when the terminal device 400 does not adjust the color gamut, the color gamut information notification unit 412 receives the color gamut information acquired by the color gamut information acquisition unit 411 via the communication I / F 40. Notify the machine 200.

The color gamut adjustment unit 413 causes the display unit 42 to display a color gamut adjustment screen that accepts a user operation for adjusting the color gamut of content based on the color gamut information acquired by the color gamut information acquisition unit 411. Then, a color gamut adjustment method is determined in accordance with a user operation during display of the color gamut adjustment screen, and the determined adjustment method is transmitted to the color gamut information notification unit 412. As a result, the receiver 200 is notified of the adjustment method.

The display unit 42 is a display device that displays an image according to the control of the control unit 41, and the input unit 43 is an input device that accepts a user input operation on the terminal device 400 and notifies the control unit 41 of the contents of the operation. . Here, an example of a touch panel in which the display surface of the display unit 42 and the input surface of the input unit 43 are integrally formed will be described, but the display unit 42 and the input unit 43 may be separate and independent devices. Good.

[Color Gamut Adjustment Method]
A color gamut adjustment method using the terminal device 400 will be described with reference to FIG. FIG. 29 is a diagram illustrating an example of a color gamut adjustment screen displayed for color gamut adjustment. Here, an example will be described in which a color gamut adjustment function is provided as one of the functions of an application that displays related information of broadcast content. That is, the color gamut information acquisition unit 411, the color gamut information notification unit 412, and the color gamut adjustment unit 413 start operation by starting the application. Of course, the color gamut information acquisition unit 411, the color gamut information notification unit 412, and the color gamut adjustment unit 413 may be activated and operated independently of the application. However, when it is incorporated in the function of the application, it is preferable because color gamut adjustment can be performed when the related information of the content is confirmed.

When the user of the terminal device 400 activates the application and the user selects content to be viewed on the receiver 200, program information of the content is acquired by the application, and color gamut information is acquired by the color gamut information acquisition unit 411. To be acquired. Then, the acquired various types of information are displayed on the display unit 42 in a manner as shown in FIG. 29A, for example.

In the screen example of FIG. 29A, the program name, broadcast time, performer, and program content are displayed as the program information, and the color gamut information acquired by the color gamut information acquisition unit 411 is displayed. Yes. In this example, as the color gamut information, the area in the chromaticity plane of the color gamut of the video of the content (program) is 80% as large as the area of the color gamut of BT.2020, and BT.709 It is displayed that it has a width of 120% with respect to the area of the color gamut.

In the screen example of FIG. 29A, the model name and display characteristics of the receiver 200 are displayed as the receiver information. In this example, as a display characteristic, the area in the chromaticity plane of the color gamut of the display 28 is 70% larger than the area of the color gamut of BT.2020, and the area of the color gamut of BT.709 On the other hand, it is displayed that it has a width of 110%. The user can determine whether or not the color gamut of the content to be displayed is within the color gamut range of the display 28 by comparing the display characteristics with the color gamut information. The receiver information may be acquired from the receiver 200 by causing the terminal device 400 and the receiver 200 to communicate with each other, or may be input to the terminal device 400 by the user in advance.

Furthermore, in the screen example of FIG. 29A, a key C for starting the color gamut adjustment is displayed. When the user selects this key C, the color gamut adjustment unit 413 displays a color gamut adjustment screen as shown in FIG. Such a color gamut adjustment screen can be displayed by acquiring outer edge coordinates as color gamut information.

The color gamut adjustment screen in (b) of the figure is a screen in which the color gamut of the content video and the color gamut of the display 28 are displayed on the chromaticity plane. By displaying such a color gamut adjustment screen, the user can recognize which part of the color gamut of the content video should be adjusted. In addition, on this color gamut adjustment screen, the shape of the outer edge can be changed by selecting and dragging the outer edge of the color gamut of the content video.

In the illustrated example, the position P1 corresponding to the apex of the triangle indicating the color gamut of the content video is selected. Then, as shown in FIG. 5C, by moving the selection position from this position P1 to a position P2 within the color gamut range of the display 28c, the vertex of the color gamut of the content video is moved, and the display The state falls within the color gamut range of 28c. In this way, when the outer edge of the color gamut of the content video is deformed, the color gamut adjustment unit 413 determines a color gamut adjustment method in which the color gamut of the content video is deformed in this way. To the color gamut information notification unit 412. As a result, the receiver 200 is notified of the adjustment method, and the video of the content is displayed after being adjusted by the adjustment method.

As described above, according to the video signal transmission system 500 of the present embodiment, the user can adjust the color gamut of the content displayed on the receiver 200 with the terminal device 400 to suit his / her preference. . In this video signal transmission system 500, the transmitter 100 does not need to perform processing for color gamut adjustment such as acquisition and transmission of color gamut information, and is therefore used in conventional broadcasting stations. Such a general transmitter can be applied as it is.

Further, in the video signal transmission system 500, it is not necessary to provide the receiver 200 with a configuration for accepting a user operation for adjusting the color gamut, and a user operation for adjusting the color gamut simply by installing an application on the terminal device 400 is possible. Can be accepted. Therefore, the user can easily adjust the color gamut without increasing the manufacturing cost of the receiver 200.

[Embodiment 12: Modification]
The transmitter 1c of the above embodiment includes a function as a transmission device that transmits color gamut information to the receiver 2c, a function as a control information generation device that generates an AIT for acquiring color gamut information, and a digital broadcast signal. And a function as a broadcast signal transmitting apparatus for transmitting the. However, a function similar to that of the transmitter 1c can be realized by a combination of a transmission device, a control information generation device, and a broadcast signal transmission device that are independent from each other. For example, even in a video signal transmission system including a transmission device that transmits color gamut information, a control information generation device that generates the AIT, and a broadcast signal transmission device that transmits a broadcast signal, the same as the transmitter 1c. Can be realized. For example, the same function as that of the transmitter 1c can be realized by a combination of a transmission device that transmits color gamut information and a device that has the function of generating the AIT and the function of transmitting a broadcast signal.

In each of the above embodiments, the example in which the content is transmitted through the broadcast path has been described. However, the content may be transmitted through the communication path. Further, the content transmitted through the broadcast route and the content transmitted through the communication route may be combined and reproduced.

[Embodiment 13: Implementation example by software]
Control blocks of the transmitter 1c, the receiver 2c, the receiver 200, and the terminal device 400 (in particular, the control unit 15c, the multiplexing unit 12c, the encryption unit 13c, the transmission unit 14c, the decryption unit 22c, the demultiplexing unit 23c, the color The area conversion unit 26c, the display control unit 27c, the control unit 30c, and the control unit 41) may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be a CPU (Central Processing Unit). ) May be implemented by software.

In the latter case, the transmitter 1c, the receiver 2c, the receiver 200, and the terminal device 400 are a CPU that executes instructions of a program that is software that realizes each function, and the program and various data are computers (or CPUs). A ROM (Read Only Memory) or a storage device (referred to as “recording medium”) recorded in a readable manner, a RAM (Random Access Memory) for developing the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A transmission device (transmitter 1c, terminal device 400) according to an aspect 32 of the present invention is a transmission device that transmits information to a reception device (receiver 2c) that supports a service that uses both a broadcast path and a communication path. A color gamut information acquisition unit (152c, 411) that acquires color gamut information relating to the color gamut of the video of the content transmitted to the receiving device, and a color gamut that transmits the color gamut information to the receiving device via a communication path. An information transmission unit (color gamut information notification unit 153c, color gamut information notification unit 412).

According to the above configuration, the color gamut information is transmitted to the receiving device via the communication path. Here, since the receiving apparatus supports a service (for example, hybrid cast) using both a broadcast path and a communication path, the content can be reproduced using color gamut information received via the communication path. Therefore, according to the above configuration, it is possible to cause the receiving apparatus that has received the color gamut information to reproduce the content after adaptively converting the color gamut of the content according to the color gamut information. .

In the transmission device according to aspect 33 of the present invention, in the aspect 32, the color gamut information transmission unit may transmit timing designation information indicating a timing to apply the color gamut information.

According to the above configuration, since the timing designation information is transmitted, the color gamut conversion corresponding to the color gamut information can be applied at the timing indicated by the timing designation information. This makes it possible to apply different color gamut conversion in units of frames, for example. As the timing designation information, it is preferable to apply time information used for synchronization control in broadcasting, such as a system clock.

In the transmission device according to aspect 34 of the present invention, in the aspect 32 or 33, the color gamut information includes color gamut conversion information indicating a conversion method for converting the color gamut of the video of the content into a narrower color gamut. It may be.

According to the above configuration, since the color gamut information includes the color gamut conversion information, the receiving device that has received the color gamut information uses the conversion method indicated by the color gamut conversion information, and uses the conversion method indicated by the color gamut conversion information. Can be converted to a narrower color gamut. That is, according to the above configuration, it is possible to convert the color gamut of the content video to a narrower color gamut without causing the receiving apparatus to perform the process of determining the color gamut conversion method.

In the transmission device according to aspect 35 of the present invention, in any one of the aspects 32 to 34, the color gamut information includes an outer edge indicating an outer edge of the color gamut of the content represented on a chromaticity space or a chromaticity plane. Coordinates may be included.

According to the above configuration, the color gamut information includes the outer edge coordinates indicating the outer edge of the color gamut of the content represented on the chromaticity space or the chromaticity plane. Therefore, the receiving device that has received the color gamut information can identify how wide the color gamut of the received content is. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the transmission device according to aspect 36 of the present invention, in any one of the aspects 32 to 35, the color gamut information includes, in the color gamut information, an area that the color gamut of the content occupies on the chromaticity plane and a comparison target of the color gamut Area ratio information indicating a ratio of a predetermined color gamut to an area on the chromaticity plane may be included.

According to the above configuration, in the color gamut information, the area occupied by the content color gamut on the chromaticity plane and the color gamut predetermined as a comparison target with the color gamut occupy on the chromaticity plane. Area ratio information indicating the ratio with the area is included. Therefore, the receiving device that has received the color gamut information can specify how large or how small the color gamut of the received content is compared with the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the transmission device according to aspect 37 of the present invention, in any of the aspects 32 to 36, the color gamut of the content includes a color gamut predetermined as a comparison target with the color gamut. Information indicating the degree of going out may be included.

According to the above configuration, the color gamut information includes information indicating the degree to which the color gamut of the content is outside the color gamut predetermined as a comparison target with the color gamut. Therefore, the receiving device that has received the color gamut information can specify how far the color gamut of the received content protrudes from the color gamut to be compared. Thus, according to the display on which the content is displayed, it is possible to appropriately display the content with or without converting the color gamut of the content appropriately.

In the transmission device according to aspect 38 of the present invention, in any of the above aspects 32 to 37, the color gamut information includes correspondence standard information indicating a video standard in which a color gamut including the color gamut of the content is defined ( Corresponding format information) may be included.

According to the above configuration, the color gamut information includes the corresponding standard information indicating the video standard in which the color gamut including the color gamut of the content is defined. Therefore, the receiving device that has received the color gamut information determines that the display for displaying the content can be displayed without converting the color gamut of the content if the display conforms to the video standard. can do. On the other hand, if the display for displaying the content does not conform to the video standard or conforms to a video standard having a narrower color gamut than the video standard, it is necessary to convert the color gamut of the content. It can be determined that there is. Therefore, according to said structure, according to the display which displays a content, the said color gamut of the said content can be displayed appropriately, without converting.

In the transmission device according to aspect 39 of the present invention, in any of the aspects 32 to 38, the color gamut information indicates a video standard in which a color gamut that does not include at least a part of the color gamut of the content is defined. Non-compliant standard information (non-compliant format information) may be included.

According to the above configuration, the color gamut information includes non-compliant standard information indicating a video standard in which a color gamut that does not include at least a part of the color gamut of the content is included. Therefore, the receiving device that has received the color gamut information, when the display for displaying the content conforms to the video standard, or conforms to a video standard having a narrower color gamut than the video standard, It can be determined that the color gamut of the content needs to be converted. Therefore, according to said structure, according to the display which displays a content, the color gamut of the said content can be converted appropriately and this content can be displayed appropriately.

The control information generating device (transmitter 1c) according to the aspect 40 of the present invention generates control information related to reproduction of content transmitted to a receiving device (receiver 2c) corresponding to a service using both a broadcast path and a communication path. A control information generation unit (154c) that generates control information (AIT) for acquiring color gamut information related to the color gamut of the video of the content, and the control information is transmitted to the reception device. And a control information transmission unit (transmission unit 14c) for transmission.

According to the above configuration, since the control information for acquiring the color gamut information is generated and transmitted to the receiving device, the receiving device can acquire the color gamut information using the control information. Therefore, according to the above configuration, the content can be reproduced after the receiving device adaptively converts the color gamut of the content according to the color gamut information.

The control information generation device according to aspect 41 of the present invention may be configured such that, in aspect 40, the control information transmission unit transmits the control information together with the content as a digital broadcast signal to the reception device.

According to the above configuration, the control information is transmitted as a digital broadcast signal together with the content. Therefore, it is possible to cause the receiving device that has received this digital broadcast signal to reproduce the content after adaptively converting the color gamut of the content according to the color gamut information acquired according to the control information.

The receiving apparatus (receiver 2c) according to the aspect 42 of the present invention is a receiving apparatus that supports a service that uses both a broadcast path and a communication path, and acquires color gamut information related to the color gamut of the video to be played back. A control information acquisition unit (303c) that acquires control information for performing the processing, and a color gamut conversion unit that converts the color gamut of the video of the content in accordance with the color gamut information acquired through the communication path according to the control information. (26c).

According to the above configuration, the control information for acquiring the color gamut information related to the color gamut of the video of the content is acquired, and the content of the content is determined according to the color gamut information acquired through the communication path according to the control information. Convert the color gamut of the video. Therefore, according to the above configuration, the content can be reproduced after adaptively converting the color gamut of the content according to the color gamut information.

A television receiver according to aspect 43 of the present invention includes the receiving device according to aspect 42 described above. Therefore, the same function and effect as that of the receiving apparatus according to aspect 42 are obtained.

The video signal transmission system 5 according to the aspect 44 of the present invention includes a transmitter (transmitter 1c) that transmits content to a receiver (receiver 2c) that supports a service that uses both a broadcast path and a communication path, and the content. A video signal transmission system including a receiving device that receives the control information for obtaining color gamut information related to the color gamut of the video of the content as a digital broadcast signal together with the content to the receiving device. Then, the receiving device acquires the color gamut information through a communication path according to the control information acquired from the digital broadcast signal, and converts the color gamut of the video of the content according to the color gamut information. Therefore, the same operational effects as the transmission device of aspect 1 and the reception device of aspect 42 are obtained.

The transmission device, the control information generation device, and the reception device according to each aspect of the present invention may be realized by a computer. In this case, each unit included in the transmission device, the control information generation device, or the reception device. A control program that causes the above-described transmission device, control information generation device, or reception device to be realized by a computer by operating as a computer, and a computer-readable recording medium that records the control program also fall within the scope of the present invention.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

The present invention can be used for content transmitters and receivers.

1 Transmitter (control information generator, transmitter)
14 Transmitting unit 17 Color gamut information acquiring unit 18 Control information generating unit 2 Receiver (receiving device, television receiver)
32 Control information acquisition unit 26 Color gamut conversion unit 5 Video signal transmission system

Claims

A control information generation device that generates control information for reproducing content transmitted by MMT,
A color gamut information acquisition unit that acquires color gamut information related to the color gamut of the video of the content;
And a control information generating unit that generates an MMT package table including the color gamut information.
2. The control information generation according to claim 1, wherein the color gamut information includes outer edge coordinates indicating an outer edge of the color gamut of the content represented on a chromaticity space or a chromaticity plane. apparatus.
The color gamut information indicates a ratio between the area occupied by the content color gamut on the chromaticity plane and the area occupied by the color gamut predetermined as a comparison target with the color gamut on the chromaticity plane. The control information generating apparatus according to claim 1, wherein the area ratio information is included.
The color gamut information includes information indicating a degree to which a color gamut of the content is out of a predetermined color gamut as a comparison target with the color gamut. Item 4. The control information generation device according to any one of Items 1 to 3.
A receiving device for receiving content transmitted by MMT,
A control information acquisition unit that acquires an MMT package table including color gamut information relating to the color gamut of the video of the content;
A receiving apparatus comprising: a color gamut conversion unit that converts a color gamut of a video of the content according to the color gamut information.
A video signal transmission system including a transmitting device that transmits content in MMT and a receiving device that receives the content,
The transmission device transmits an MMT package table including color gamut information indicating a color gamut of the video of the content to the reception device as a digital broadcast signal together with the content,
The video signal transmission system, wherein the receiving device acquires the MMT package table from the digital broadcast signal and converts the color gamut of the content video according to the color gamut information.
A control program for causing a computer to function as the control information generating device according to any one of claims 1 to 4, wherein the control program causes the computer to function as each of the units.
A control program for causing a computer to function as the receiving device according to claim 5, wherein the control program causes the computer to function as each of the above-described units.