WO2017150095A1 - Reception device and broadcast system - Google Patents

Abstract

Provided are a reception device and a broadcast system with which it is possible, when an image is received having a luminance range that exceeds the capability of a display unit, to appropriately adjust the luminance of the image according to a program. A service information processing unit acquires luminance information pertaining to a first luminance range that is the luminance range of the image of content on the basis of the service information for the content, and a luminance adjustment unit adjusts the luminance of the image to within a second luminance range, which is the luminance range within which the display unit can display the image, on the basis of the result of comparison of the second luminance range and the first luminance range.

Description

Receiving apparatus and broadcasting system

The present invention relates to a receiving apparatus and a broadcasting system.
This application claims the priority of Japanese Patent Application No. 2016-039996 filed in Japan on March 2, 2016 and the priority of Japanese Patent Application No. 2017-017437 filed in Japan on February 2, 2017, The entire contents of each are incorporated herein.

As part of the advancement of broadcasting, the introduction of video data that can reproduce a wider range of brightness than before has been proposed. Such video data is specifically an HDR (High Dynamic Range; also called high dynamic range, high dynamic range, wideband dynamic range) video signal. HDR video data can express a luminance in a significantly wider range than a conventionally used SDR (Standard Dynamic Range) video signal. HDR video data is expected to be adopted in so-called 4K / 8K broadcasting. 4K / 8K broadcasting is a common name for ultra high definition television broadcasting (UHDTV: Ultra High Definition Television) that broadcasts video with 3840 × 2160 pixels or 7680 × 4320 pixels.

Depending on the performance of the display, the video intended by the creator may not be reproduced based on HDR video data representing a wide range of brightness. Therefore, it is expected to perform processing for converting the received HDR video data so that the luminance of the video falls within the range that can be expressed by the display. This process is roughly divided into the following two methods. One is a method of converting the signal value so that the entire luminance range expressed by the HDR video data is compressed within a range that can be expressed by the display. This method is generally called compression or compression. In this method, an image having luminance gradation based on the signal value is reproduced, but is displayed darker as a whole than the original image before compression. For example, Patent Document 1 describes image signal conversion including a step of converting a pixel color component represented by received data to a value in the device color space when the pixel color component is not in the device color space. The other is a method of replacing a signal value indicating luminance outside the range that can be expressed by the display with a signal value indicating predetermined luminance within the range that can be expressed. This method is generally called clipping. In this method, the luminance within the range that can be expressed by the display can be accurately expressed, but the luminance outside the range that can be expressed, mainly the high luminance gradation, is lost. For example, Patent Document 2 describes a visual processing device that corrects an image signal based on a gain signal limited by a predetermined limit value.

Japan Special Table 2012-520050 Japanese Unexamined Patent Publication No. 2007-31349

Depending on the luminance range represented by the received HDR video data, it is conceivable to switch between conversion methods, for example, compression and clipping. On the other hand, the range of brightness of the broadcast video changes from moment to moment. For this reason, the brightness of the same subject may change as the program progresses.
Therefore, when a video having a wide luminance range exceeding the capability of the display unit is received, there has been a problem that the luminance of the video cannot be adjusted appropriately.

The present invention has been made to solve the above problems, and one aspect of the present invention is a service for acquiring luminance information related to a first luminance range, which is a luminance range of the video of the content, based on the service information of the content. A luminance adjustment for adjusting the luminance of the video within the second luminance range based on a comparison result between the information processing unit and a second luminance range that is a luminance range in which the display unit can display the video and the first luminance range A receiving device.

According to the embodiment of the present invention, when a video having a wide luminance range exceeding the capability of the display unit is received, the luminance of the video can be appropriately adjusted according to the program.

It is a schematic block diagram which shows the structure of the broadcast system which concerns on 1st Embodiment. It is a schematic block diagram which shows the structure of the transmitter which concerns on 1st Embodiment. It is a schematic block diagram which shows the structure of the receiver which concerns on 1st Embodiment. It is a figure which shows an example of the data structure of MH-EIT which concerns on 1st Embodiment. It is a figure which shows an example of the data structure of the brightness | luminance descriptor which concerns on 1st Embodiment. It is a figure which shows an example of EPG which concerns on 1st Embodiment. It is a figure which shows an example of the correspondence of a luminance value and a luminance. It is a flowchart which shows the luminance information acquisition process which concerns on 1st Embodiment. It is a flowchart which shows an example of the brightness | luminance conversion process which concerns on 1st Embodiment. It is a figure which shows an example of the data structure of MPT which concerns on the modification of 1st Embodiment. It is a flowchart which shows the luminance information acquisition process which concerns on the modification of 1st Embodiment. It is a schematic block diagram which shows the structure of the broadcast system which concerns on 2nd Embodiment. It is a schematic block diagram which shows the structure of the receiver which concerns on 2nd Embodiment. It is a figure which shows an example of the application control which concerns on 2nd Embodiment. It is a figure which shows the other example of application control which concerns on 2nd Embodiment. It is a figure which shows the luminance information and application example which concern on 2nd Embodiment. It is a flowchart which shows an example of the application control which concerns on 2nd Embodiment. It is a flowchart which shows the other example of application control which concerns on 2nd Embodiment. It is a figure which shows one execution example of the application which concerns on 2nd Embodiment. It is a figure which shows one execution example of the application which concerns on the modification of 2nd Embodiment. It is explanatory drawing which shows the master monitor information which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, an overview of the broadcast system 1 according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic block diagram showing a configuration of a broadcasting system 1 according to the present embodiment.
The broadcast system 1 includes a transmission device 10 and a reception device 20.
The transmission device 10 transmits program data representing the content of the broadcast program to the reception device via the broadcast transmission path BT. The content includes video and audio. The broadcast transmission path BT is a transmission path for unilaterally and simultaneously transmitting program data to an unspecified number of receiving devices 20. The broadcast transmission path BT is a broadcast wave having a predetermined frequency band, for example. The broadcast transmission path BT may include a broadcast satellite BS that relays broadcast waves. A part of the broadcast transmission path BT may include a network, for example, a dedicated line or a VPN (Virtual Private Network). The receiving device 20 receives program data transmitted via the broadcast transmission path BT. The receiving device 20 displays an image based on the received program data. The receiving device 20 is an electronic device such as a television receiving device or a set-top box that can receive program data and display a video related to the received program data on a display unit. Although the number of transmitting apparatuses 10 and receiving apparatuses 20 shown in FIG. 1 is one each, there are generally a plurality. The broadcast system 1 uses a case where an MMT (MPEG Media Transport) system is used as a media transport system.

Broadcast system 1 can broadcast a plurality of broadcast programs having different luminance dynamic ranges. In other words, in the broadcast system 1, an HDR broadcast program and an SDR broadcast program are broadcast. The HDR broadcast program is a broadcast program that includes an HDR video whose luminance range is HDR as a constituent element. The SDR broadcast program is a broadcast program including an SDR video whose luminance range is SDR as a component. Video data representing HDR video and video data representing SDR video are referred to as HDR video data and SDR video data, respectively.

(Brightness of image)
There are two types of video brightness, optical brightness and image brightness. Optical luminance is one of physical quantities representing the brightness of a light source. The optical luminance is used, for example, to represent the brightness of an image emitted from the display. In the present embodiment, as an example, 0 the luminance range of ~ 10000 cd / ^{m 2} referred to as HDR, referred luminance range of 0 ~ 100 cd / ^{m 2} and SDR. That is, HDR has a wider dynamic range of optical brightness than SDR. Note that the HDR and SDR luminance ranges are not limited to those described above, and may be arbitrarily determined according to, for example, a broadcasting system. Hereinafter, the dynamic range of the optical brightness may be simply referred to as the dynamic range. The image brightness means a signal level representing the brightness of an image or a relative value thereof. In the following description, optical luminance and image luminance may be referred to as luminance and luminance value, respectively.

The broadcast system 1 transmits broadcast program data including HDR video data or SDR video data. HDR video data is, for example, SMPTE (Society of Motion Picture and Television Engineers, American Film and Television Engineers Association) ST. The video format is defined by 2084-2014. In the following description, this video format is referred to as the HDR format. In the HDR video data, the luminance within the HDR luminance range is associated with the luminance value. In the example shown in FIG. 7, when the luminance value for each pixel is represented by 10 bits, the luminance value of 0 to 1023 corresponds to the luminance of 0 to 10000 cd / m ² . The SDR video data is, for example, Rec. ITU-R BT. 709. In the following description, this video format is referred to as an SDR format. In the SDR video data, the luminance within the luminance range of SDR is associated with the luminance value. In SDR video data, the number of bits for representing the luminance value for each pixel is smaller than that in HDR video data. For example, when the luminance value for each pixel is represented by 8 bits, the luminance value of 0 to 255 corresponds to the luminance of 0 to 100 cd / m ² .

(Configuration of transmitter)
Next, the configuration of the transmission device 10 according to the present embodiment will be described.
FIG. 2 is a schematic block diagram illustrating a configuration of the transmission device 10 according to the present embodiment.
The transmission device 10 multiplexes program data and service information, and transmits the multiplexed data to the broadcast transmission path BT. The program data includes video data and audio data. The transmission apparatus 10 includes an encoding control unit 110, a video encoding unit 120, an audio encoding unit 130, a service information acquisition unit 140, a multiplexing unit 150, an encryption unit 160, and a transmission unit 170.

The encoding control unit 110 controls encoding processing of video data input to the video encoding unit 120 and encoding processing of audio data input to the audio encoding unit 130. The encoding control unit 110 detects the luminance value represented by the video data and the luminance range for each program indicated by the luminance value. For example, the encoding control unit 110 selects the HDR format when the detected luminance range exceeds a predetermined SDR luminance range, and selects the SDR format when the detected luminance range does not exceed the predetermined SDR luminance range. The encoding control unit 110 instructs the video encoding unit 120 on the selected format. The encoding control unit 110 instructs the audio encoding unit 130 in a predetermined format (for example, a data format defined by ISO / IEC 14496-3 MPEG-4 AUDIO).
The encoding control unit 110 outputs information on the data format of the selected video data and audio data and information on the detected luminance range to the service information acquisition unit 140.

The video encoding unit 120 encodes input video data using a predetermined encoding method (for example, ISO / IEC 23008-2 HEVC: High Efficiency Video Coding). The video encoding unit 120 includes video encoded data obtained by encoding, and generates video data having a format indicated by the encoding control unit 110. The video encoding unit 120 outputs the generated video data to the multiplexing unit 150.

The audio encoding unit 130 encodes input audio data using a predetermined encoding method (for example, ISO / IEC 14496-3 MPEG-4 AUDIO). The speech encoding unit 130 outputs speech data including speech encoded data obtained by encoding and having a format indicated by the encoding control unit 110 to the multiplexing unit 150.

The service information acquisition unit 140 generates service information based on the data format information and the luminance range information input from the encoding control unit 110. The service information is information related to the provision of a broadcast service such as the program provision form and configuration. The service information is included in, for example, MMT-SI (Service Information) in the MMT (MPEG Media Transport) system. The MMT-SI includes, for example, MPT (MMT Package Table; MMT Package Table), MH-EIT (MH-Event Information Table, MH-Event Information Table). The MPT is a data table including a list of assets which are constituent elements of a program, that is, video and audio, and information indicating conditions for providing them.

The MH-EIT is a data table including information related to each program, for example, information indicating the program name, broadcast date and time, description of broadcast content, and the like. The service information acquisition unit 140 includes luminance information, which is information related to the luminance range of the video constituting the program, in the MH-EIT. An example of service information will be described later. The service information acquisition unit 140 outputs the acquired service information to the multiplexing unit 150 every predetermined time (for example, 0.1 to 0.5 ms). The service information is updated as the program progresses. If not updated, the same service information is repeated a plurality of times. Thereby, the receiving device 20 can present a program based on the broadcast signal received at an arbitrary time.
The service information acquisition unit 140 may receive service information generated in advance from another device.

The multiplexing unit 150 multiplexes the video data input from the video encoding unit 120, the audio data input from the audio encoding unit 130, and the service information input from the service information acquisition unit 140 to a predetermined format ( For example, multiplexed data having MMT format) is generated. The multiplexing unit 150 outputs the generated multiplexed data to the encryption unit 160. Note that either or both of video data and audio data may be input to the multiplexing unit 150 from another device. If the format of the video data from another device is the same as the format of the video data from the video encoding unit 120, the video encoding unit 120 may be omitted. If the format of the audio data from the other device is the same as the format of the audio data from the audio encoding unit 130, the audio encoding unit 130 may be omitted.

The encryption unit 160 encrypts the multiplexed data input from the multiplexing unit 150 using a predetermined encryption method (for example, AES: Advanced Encryption Standard). The encryption unit 160 outputs the encrypted data obtained by the encryption to the transmission unit 170.
The transmission unit 170 modulates the encrypted data input from the encryption unit 160 to generate a broadcast signal having a predetermined frequency band. The transmission unit 170 transmits the generated broadcast signal to the broadcast transmission path BT. The broadcast signal is transmitted as a broadcast wave. Therefore, a broadcast signal carrying multiplexed data obtained by multiplexing program data and service information is transmitted via the broadcast transmission path BT. The transmission unit 170 includes, for example, a transmitter. As long as the program data matches the service information related to the program, the transmitted program data may not necessarily be the program data input to the transmitting device 10 at that time. The time point at which the program data is transmitted may be stored in advance in a storage unit included in the transmission device 10 and may be instructed based on the broadcast time for each program indicated by the schedule data input to the transmission device 10.

(Configuration of transmitter)
Next, the configuration of the receiving device 20 according to this embodiment will be described.
FIG. 3 is a schematic block diagram illustrating a configuration of the receiving device 20 according to the present embodiment.
The receiving device 20 includes a broadcast receiving unit 210, a decoding unit 211, a separation unit 212, an input unit 215, a video decoding unit 221, a luminance adjustment unit 222, a display processing unit 223, an audio decoding unit 231, a control unit 240, a storage unit 250, The display unit 22 and the loudspeaker unit 23 are included. One or both of the display unit 22 and the loudspeaker unit 23 may be detachable from the main body of the receiving device 20.

The broadcast receiving unit 210 receives a channel selection signal from the channel selection unit 241 of the control unit 240. The broadcast receiving unit 210 receives a broadcast signal transmitted through a channel indicated by the channel selection signal. The broadcast receiving unit 210 includes, for example, a tuner that receives broadcast waves. The tuner receives a broadcast wave in a frequency band corresponding to the channel specified by the channel selection signal. The broadcast receiving unit 210 demodulates the received broadcast signal and outputs encrypted data obtained by the demodulation to the decryption unit 211.

The decryption unit 211 decrypts the encrypted data input from the broadcast reception unit 210 using a predetermined decryption method. The predetermined decryption method is a decryption method corresponding to the encryption method used by the encryption unit 160. The decoding unit 211 outputs the multiplexed data obtained by the decoding to the separation unit 212.

The separation unit 212 separates program data and service information from the multiplexed data input from the decoding unit 211. The separation unit 212 separates video data and audio data from the program data. The separation unit 212 outputs the separated video data to the video decoding unit 221, and outputs the separated audio data to the audio decoding unit 231. The separation unit 212 outputs the separated service information to the service information processing unit 242.

The input unit 215 receives an operation signal generated by a user operation. The input unit 215 includes, for example, an infrared interface that receives an operation signal from a remote controller (control device) RC using infrared rays. For example, the operation signal specifies information such as power on / off, a channel for receiving a broadcast wave, luminance, and luminance range. The input unit 215 outputs an operation signal to the control unit 240. Note that the input unit 215 may include a physical member for receiving a user operation, for example, various buttons and knobs, and may generate an operation signal corresponding to the operation. The input unit 215 outputs the input operation signal to the control unit 240.

Video data in a format instructed by the service information processing unit 242 is input from the separation unit 212 to the video decoding unit 221. The video decoding unit 221 decodes the input video data using a predetermined video decoding method. The predetermined video decoding method is a decoding method corresponding to the encoding method used by the video encoding unit 120. The video decoding unit 221 outputs the decoded video data to the luminance adjustment unit 222.

The luminance adjusting unit 222 adjusts the luminance of the video indicated by the video data input from the video decoding unit 221 within a predetermined displayable luminance range based on the luminance information input from the service information processing unit 242. The luminance information includes information on the luminance range of the video as information on the luminance of the video of the program. The displayable luminance range is a luminance range that can be displayed by the display unit 22. The luminance adjustment unit 222 determines a method for adjusting the luminance of the video indicated by the video data, based on the excess amount of the displayable luminance range of the luminance range of the video. The luminance adjustment unit 222 outputs video data indicating the video whose luminance has been adjusted to the display processing unit 223. A method for adjusting the luminance will be described later.

The display processing unit 223 generates a display video by superimposing the display information input from the display information acquisition unit 243 on the video input from the luminance adjustment unit 222. The display information includes various dialog screens and setting screens. The display processing unit 223 outputs video data indicating the generated display video to the display unit 22.

The display unit 22 displays a video based on the video data input from the display processing unit 223. The display unit 22 is, for example, a liquid crystal display (LCD: Liquid Crystal Display), an organic EL (Electroluminescence) display, or the like. An organic EL display is a display having an organic light emitting diode (OLED) as a light emitting element. As the display unit 22, a display having various displayable luminance ranges may be used.
A display capable of displaying the luminance of the entire luminance range of the HDR video may be used, or a display capable of displaying the luminance within the luminance range of the SDR video, but not capable of displaying the luminance exceeding the luminance range. There is also. The luminance adjusting unit 222 detects the display unit 22 connected to the display processing unit 223, detects model information from the detected display unit, and sets a luminance range corresponding to the model information based on a preset luminance setting table. You may specify. The brightness setting table is data formed by associating model information and information on the brightness range.

Voice data in a format instructed by the service information processing unit 242 is input from the separation unit 212 to the voice decoding unit 231. The voice decoding unit 231 decodes the input voice data using a predetermined voice decoding method. The predetermined speech decoding method is a decoding method corresponding to the encoding method used by the speech encoding unit 130. The voice decoding unit 231 outputs the decoded voice data to the loudspeaker unit 23.

The loudspeaker 23 reproduces voice based on the voice data input from the voice decoder 231. The loudspeaker 23 includes, for example, a speaker.

The control unit 240 performs various controls related to the operation of the receiving device 20. The control unit 240 includes a channel selection unit 241, a service information processing unit 242, and a display information acquisition unit 243.
The channel selection unit 241 identifies a channel that receives a broadcast signal from the operation signal input from the input unit 215. The channel selection unit 241 generates a channel selection signal indicating the identified channel, and outputs the generated channel selection signal to the broadcast reception unit 210.

The service information processing unit 242 performs various controls related to the presentation of the program based on the service information input from the separation unit 212. The service information processing unit 242 extracts MH-EIT from the service information. When the luminance information is detected from the MH-EIT, the service information processing unit 242 outputs the detected luminance information to the luminance adjusting unit 222. The service information processing unit 242 outputs the extracted MH-EIT to the display information acquisition unit 243. In addition, the service information processing unit 242 specifies the format of video data and the format of audio data as constituent elements of program data based on the MPT included in the service information. The service information processing unit 242 notifies the video decoding unit 221 of the format of the specified video data, and notifies the audio decoding unit 231 of the format of the specified audio data.

The display information acquisition unit 243 acquires display information to be displayed on the display unit 22 using either or both of an operation signal input from the input unit 215 and various types of information input from the service information processing unit 242. For example, the display information acquisition unit 243 arranges program information for each program in the order of broadcast hours by channel from the MH-EIT input from the service information processing unit 242, and displays an electronic program guide (EPG). Generate. The display information acquisition unit 243 outputs display information indicating the generated electronic program guide to the display processing unit 223. The program information constituting the electronic program guide may include luminance information of the program. In addition, when the operation signal instructing the setting is input from the input unit 215, the display information acquisition unit 243 reads the setting screen information stored in advance in the storage unit 250, and displays the read setting screen information as display information. You may output to the part 223. In addition, various warning (caution) screen information may be read in response to a request from another component, and the read warning screen information may be output to the display processing unit 223 as display information.

The storage unit 250 stores various data such as setting data used by the control unit 240 and data acquired by the control unit 240. The storage unit 250 includes various storage media such as a RAM (Random Access Memory) and a ROM (Read-only Memory). The storage unit 250 also includes a storage medium (for example, a BD (Blu-ray (registered trademark) Disc)) that stores video data of received broadcast programs and video data of content such as movies that have been produced in advance. It may be configured. The storage unit 250 may store broadcast program data and service information multiplexed on the broadcast program data in association with each other.

(MH-EIT)
Next, the data structure of MH-EIT included in service information will be described. FIG. 4 is a diagram illustrating an example of the data structure of the MH-EIT according to the present embodiment.
In the example shown in FIG. 4, MH-EIT (MH-Event_Information_Table ()) includes event identification (event_ID), start time (start_time), duration (duration), and descriptor area (descriptor ()) for each event. . Event identification indicates an event identification number, that is, program identification information. The start time indicates the start time of the program. The start time includes date and time information. The duration indicates the broadcast time length of the program.

The MH-EIT includes a descriptor area (descriptor ()) for each event identification. The descriptor area is an area for storing descriptors representing various types of information related to the program. In the descriptor area, for example, a luminance descriptor is described. Accordingly, the service information acquisition unit 140 of the transmission apparatus 10 generates an MH-EIT including a luminance descriptor describing luminance information regarding the luminance of the video of the broadcast program. The service information processing unit 242 of the receiving device 20 detects the luminance descriptor from the MH-EIT included in the service information, and reads the luminance information described in the detected luminance descriptor.
The descriptor area may include an MH-extended event descriptor (MH-Extended_Event_Descriptor ()). Detailed information about each program is described in the MH-extended format event descriptor. The detailed information can include information such as the title of the program, performers, and producers.

(Luminance descriptor)
Next, the data structure of the luminance descriptor will be described. FIG. 5 is a diagram illustrating an example of the data structure of the luminance descriptor according to the present embodiment.
In the example illustrated in FIG. 5, the luminance descriptor (Luminance_Descriptor ()) includes a descriptor tag (descriptor_tag), a descriptor length (descriptor_length), a descriptor number (descriptor_number), and a final descriptor number (last_descriptor_length, luminance description). text_length) and luminance description (text_char). In the descriptor tag, for example, “0x803A” is described as a tag (identifier) indicating that the descriptor is a luminance descriptor. The descriptor length indicates the byte length of the descriptor. The descriptor number is a number for distinguishing individual luminance descriptors when a plurality of luminance descriptors are used to represent luminance information. The descriptor numbers of the individual descriptors are numbered in ascending order from 0 in order from 0. The final descriptor number is the descriptor number of the luminance descriptor immediately before the luminance descriptor when a plurality of luminance descriptors are used. The luminance description length indicates the byte length of the immediately following luminance description. The luminance description is a 1-byte field in which a series of luminance information is described.

As described above, including luminance information in the MH-EIT constituting the service information is not accompanied by modification of the transmission apparatus 10 and other hardware constituting the transmission facility, but by modification of the control program of the service information acquisition unit 140. Can be realized. In addition, the receiving device 20 can also acquire the luminance information from the service information by modifying the service information analysis program without modifying the hardware.
By using the MH-EIT, the luminance information can be transmitted for each program. The receiving device 20 can use a process of analyzing the MH-EIT included in the EPG generation process when acquiring luminance information. Therefore, the modification scale can be relatively small.

Further, the display information acquisition unit 243 of the receiving device 20 can include luminance information for each program when generating an EPG based on the received MH-EIT. FIG. 6 is a diagram illustrating an example of an EPG according to the present embodiment. The EPG is displayed on the display unit 22 when, for example, an EPG is instructed by an operation signal.
In the example shown in FIG. 6, the EPG has a description column for each program arranged in the order in which the broadcast time precedes for each channel. The description column includes HDR and 4000 Cd as luminance information in addition to the program name, broadcast time, performer, and contents of the program. HDR and 4000 Cd indicate that the luminance range is HDR, and the maximum luminance of the video of the program is 4000 Cd / m ² . The magnitude of the luminance may be represented by a level (luminance level) discretized by a predetermined number of steps (for example, 4 to 12 steps) instead of a specific numerical value. Thereby, the user can grasp | ascertain the approximate level of the brightness | luminance range provided in each program.

Also, depending on the luminance range, the display mode such as background luminance, hue, and pattern in the description column of the program may be different. For example, in the example shown in FIG. 6, the description column of the program provided with the HDR video is displayed with shading, and the description column of the other program, that is, the program provided with the SDR video is displayed as plain. Thereby, the program provided with the HDR video and the program provided with the SDR video are easily identified. Further, the background of the description column may be expressed brighter as the luminance range of the video provided in the program is wider. Thereby, the user can know the luminance range of the video provided intuitively. Since the luminance information for each program is presented across the channels by using the EPG, the user can know the luminance range of the video of the program provided on the channel to be switched. Then, the brightness adjusting unit 222 is given a clue for adjusting the brightness range of the video provided in the program broadcast after the channel switching.

Next, an example of luminance information described in the luminance descriptor will be described. The luminance information described in the luminance descriptor includes, for example, (1) minimum value and maximum value of luminance value, (2) minimum value and maximum value of luminance, (3) luminance ratio, (4) other information, Can be included. (1) The minimum and maximum luminance values mean the minimum and maximum luminance values for each pixel represented by video data provided in a program. When the luminance value for each pixel is represented by 10 bits, the minimum value and the maximum value of the luminance value are represented by any value from 0 to 1023. (2) The minimum and maximum luminance values mean the minimum and maximum luminance values (unit: Cd / m ² ) for each pixel represented by video data provided in a program. (3) The luminance ratio is a value (unit:%) represented by using a representative value of luminance values indicated by video data provided in a program as an IRE value. The representative value is, for example, a maximum value or an average value. The IRE value is a value obtained by normalizing the luminance value with a predetermined signal value representing the reference black level as 0% and a predetermined signal value representing the reference white level as 100%. (4) As other information, a set of display method and luminance level is included.

(1), (2), (3), (4) may be described in the luminance descriptor as exemplified below. The display method of (4) may include additional information for specifying the model and manufacturer, such as the model, model number, version number, manufacturer name or manufacturer ID.
The following codes such as (1) and (2) are not described in the luminance descriptor.
(1) 70.800 (2) 20.3000 (3) 40 (4) P-LED 6, M-LCD 8

70.800 in (1) indicates the minimum value and the maximum value of the luminance value, respectively. (2) 20.3000 indicates the minimum value and the maximum value of the luminance, respectively. 40 in (3) is a value representing the maximum value of the luminance value as an IRE value. (4) P-LED 6 has a brightness level of 6 broadcasted on the LED display of model P, and 8 has a brightness level of broadcasted video on the M-LCD 8 model M LCD display. Indicates that there is. In this example, it is assumed that the luminance level of the display used as the display unit 22 is preset in the luminance adjustment unit 222 and has a different relationship with the luminance range represented by the luminance level. If a luminance level table indicating the relationship with the luminance range (luminance maximum value) represented by the luminance level is stored in the storage unit 250 in advance, the luminance adjusting unit 222 sets the luminance level specified with reference to the luminance level table. A corresponding luminance range can be specified. When the display methods and manufacturers are limited to several types, the program producer can produce a video by knowing in advance the luminance range that can be expressed by the display by touching the luminance level. As described above, the number of sets of the display method and the luminance level in (4) may be a plurality of sets or one set.

The luminance information described in the luminance descriptor may include at least one of (1) to (4). In the example shown in FIG. 7, the minimum and maximum luminance values 70 and 800 are respectively associated with the minimum and maximum luminance values of the video, 20 and 3000 cd / m ² . Further, the minimum value among the maximum value and the minimum value of the luminance value (1), and the minimum value among the maximum value and the minimum value of the luminance value (2) may be omitted. Even in such a case, it is because the luminance range of the video provided to the program is approximately expressed by regarding the minimum value as 0 or a sufficiently small value within a predetermined range from 0. Information representing these luminance ranges is used for luminance adjustment in the luminance adjustment unit 222.

(Luminance information acquisition processing)
Next, luminance information acquisition processing according to this embodiment will be described. FIG. 8 is a flowchart showing luminance information acquisition processing according to the present embodiment. The process shown in FIG. 8 is started after the service information processing unit 242 extracts MH-EIT from the service information input from the separation unit 212.

(Step S101) The service information processing unit 242 extracts one descriptor from the extracted descriptor area of the MH-EIT. The descriptor extracted at the first time is a descriptor described at the top of the descriptor area. Thereafter, the process proceeds to step S102.
(Step S102) The service information processing unit 242 determines whether or not the descriptor tag described in the descriptor descriptor (descriptor_tag) of the extracted descriptor matches the tag “0x803A” of the luminance descriptor. Thereby, it is determined whether or not the extracted descriptor is a luminance descriptor. When it is determined that they match (YES in step S102), the process proceeds to step S103. When it is determined that they do not match (NO in step S102), the process proceeds to step S104.

(Step S103) The service information processing unit 242 extracts the luminance information described in the extracted luminance descriptor, and outputs the extracted luminance information to the luminance adjusting unit 222. Thereafter, the process shown in FIG.
(Step S104) The service information processing unit 242 determines whether or not the next descriptor exists in the descriptor area. When it is determined that it exists (YES in step S104), the target descriptor is changed to the next descriptor, and the process returns to step S101. When it is determined that it does not exist (NO in step S104), the process in FIG. 8 ends.
By the processing shown in FIG. 8, it is determined whether or not the luminance information is included in the MH-EIT, and when it is included, the luminance information is output to the luminance adjusting unit.

(Brightness conversion processing)
Next, an example of luminance conversion processing according to the present embodiment will be described. FIG. 9 is a flowchart illustrating an example of the luminance conversion process according to the present embodiment. The example shown in FIG. 9 is an example in which information that explicitly expresses the maximum luminance in the luminance information of the video, that is, (1) the maximum value of the luminance value and (2) the maximum value of the luminance is described. In the following description, the maximum luminance value and the maximum luminance value are collectively referred to as maximum luminance.

(Step S111) The luminance adjustment unit 222 compares the maximum luminance of the video indicated by the luminance information of the video input from the service information processing unit 242 with the maximum luminance that can be displayed by the display unit 22 (display). Thereafter, the process proceeds to step S112.
(Step S112) When the maximum luminance of the video is larger than the maximum luminance of the display unit 22 (YES in Step S112), the process proceeds to Step S113. If the maximum luminance of the video is less than or equal to the maximum luminance of the display unit 22 (NO in step S112), the process proceeds to step S116.
(Step S113) When the maximum luminance of the video is larger than the maximum luminance of the display unit 22 by a predetermined excess amount (YES in Step S113), the process proceeds to Step S114. The excess amount is, for example, 10 to 30% of the maximum value in the luminance value region and 23 to 78% of the maximum value in the luminance region (when the gamma value is 2.2). When the degree that the maximum luminance of the video is larger than the maximum luminance of the display unit 22 is less than the predetermined excess amount (NO in step S113), the process proceeds to step S115.

(Step S <b> 114) The luminance adjustment unit 222 performs compression processing so that the maximum luminance of the video indicated by the video data input from the video decoding unit 221 is less than or equal to the maximum luminance of the display unit 22. In the compression processing, for example, the luminance adjustment unit 222 has a range of luminance values from the luminance value related to the minimum luminance of the video to the luminance value related to the maximum luminance, depending on the luminance value related to the minimum luminance of the display unit 22. The luminance value for each pixel is linearly converted so that the luminance value is within the range up to the luminance value. The luminance adjustment unit 222 outputs video data representing the luminance value for each pixel obtained by the compression processing to the display processing unit 223. Thereafter, the process shown in FIG. 9 ends.

(Step S115) The luminance adjustment unit 222 performs clipping processing on the video represented by the video data input from the video decoding unit 221 so that the luminance exceeding the maximum luminance of the display unit 22 becomes the maximum luminance. In the clipping processing, for example, the luminance adjustment unit 222 selects a luminance value of a pixel that exceeds a luminance value related to the maximum luminance of the display unit 22 among luminance values for each pixel of the video as a luminance value related to the maximum luminance of the display unit 22. Replace with The luminance adjustment unit 222 outputs video data representing the luminance value for each pixel obtained by the clipping process to the display processing unit 223. Thereafter, the process shown in FIG. 9 ends.

(Step S116) The luminance adjusting unit 222 outputs the video data input from the video decoding unit 221 to the display processing unit 223 without performing the conversion process. Thereafter, the process shown in FIG. 9 ends.

Note that, according to the clipping process, a portion with high luminance in the displayed video is uniformized to the maximum luminance that can be displayed by the display unit 22. When the luminance range of the video provided by the program is much larger than the luminance range that can be displayed by the display unit 22, the ratio of such a portion to the entire video increases. For this reason, the processed video is recognized as a whitened video. However, when the luminance range of the video provided by the program is less than the luminance range that can be displayed by the display unit 22, the ratio of the portion to the entire image is small. For this reason, even after processed video, a video having a quality close to that of an HDR video that should be originally displayed is displayed. Furthermore, when the luminance range of the video provided by the program does not exceed the luminance range that can be displayed by the display unit 22, the original HDR video is displayed.

On the other hand, according to the compression process, the spatial change (gradation) of the gradation of the entire video is expressed so that the luminance range of the video provided by the program falls within the luminance range that can be displayed by the display unit 22. Therefore, even when the luminance range of the video provided by the program is much larger than the luminance range that can be displayed by the display unit 22, the processed video is a white-crushed video like the video obtained by the clipping process. Not recognized. However, when the amount of excess of the luminance range of the video provided by the program from the luminance range that can be displayed is relatively small, there is a phenomenon that the luminance is reduced over the entire video as compared with the HDR video that should be originally displayed. Recognized relatively prominently.

According to the processing shown in FIG. 9, compression processing is performed when the excess amount from the luminance range that can be displayed by the display unit 22 of the luminance range of the video provided by the program is large, and clipping processing is performed when the excess amount is small Is done. Therefore, when the excess amount is large, the advantage of compression processing that the luminance range of the gradation of the entire video is expressed, and when the excess amount is small, the video having quality close to the original HDR video is displayed. The advantages of clipping processing are compatible. When the luminance range of the video provided by the program does not exceed the luminance range that can be displayed by the display unit 22, the process is not performed, and the original HDR video is completely displayed.

Even when the luminance information includes (3) a luminance ratio and (4) a combination of a display method and a luminance level, the luminance adjustment unit 222 can execute the processing illustrated in FIG. 9. However, when the luminance information includes the maximum value (3) luminance ratio as a representative value, the luminance adjustment unit 222 converts the luminance ratio into the maximum value of the luminance value, and sets the maximum value of the converted luminance value. What is necessary is just to use as the maximum brightness | luminance of the image | video mentioned above. When the luminance information includes (4) a combination of the display method and the luminance level, the luminance adjustment unit 222 specifies the display method used as the display unit 22 from the luminance information, and matches the specified method. The brightness level of the video corresponding to the method is specified.
The luminance adjusting unit 222 may specify the maximum luminance related to the luminance range corresponding to the luminance level of each of the display unit 22 and the video with reference to the specified luminance level table.

In the case where the luminance or the magnitude of the luminance value is expressed as the luminance level, the luminance adjusting unit 222 is expressed as the maximum luminance and the luminance level of the video expressed as the luminance level in the process shown in FIG. The maximum brightness of the display of the display unit 22 may be directly compared. For example, it is assumed that the luminance level of the display unit 22 is 6 out of 11 steps from 0 to 10. In that case, the brightness adjustment unit 222 selects the compression process when the brightness level of the video is 9 or 10, selects the clipping process when the brightness level of the video is 7 or 8, and the brightness level of the video is 6 or less. If it is, no processing is performed.

Note that the luminance information may include information on the appearance frequency of a luminance value larger than a predetermined luminance value in the HDR video data. The predetermined luminance value is, for example, a luminance value (for example, 512 for 10 bits) indicating the maximum luminance value (for example, 100 cd / m ² ) expressed in the SDR video. Therefore, in the process of step S113, when the brightness adjustment unit 222 determines that the maximum brightness of the video is greater than the maximum brightness of the display by a predetermined excess amount, the appearance frequency is lower than the predetermined appearance frequency threshold. The process may proceed to step S115. By this process, the clipping process is selected. Even when the maximum luminance is high, if there are few pixels with high luminance, an image having quality close to that of the original HDR image is displayed.

[Information on the appearance frequency of the luminance value may include information on the cumulative frequency for each luminance value from the maximum luminance value in the HDR video (for example, 940 for 10 bits). In that case, the luminance adjustment unit 222 may set a predetermined luminance value as the luminance value related to the maximum luminance of the display unit 22. Moreover, the information on the appearance value of the luminance value may include information on the appearance frequency of the luminance value larger than the luminance value related to the maximum luminance for each display method. In that case, the luminance adjustment unit 222 may determine the appearance frequency of a luminance value larger than the luminance value related to the maximum luminance of the display method used as the display unit 22 from the luminance information as the predetermined luminance value. .

(Additional information of brightness information and brightness adjustment)
Note that the luminance information may further include (5) conversion information (conversion flag) indicating HDR video data converted from SDR video data as additional information. In that case, the luminance adjustment unit 222 may perform a luminance expansion process on the video data. In the luminance expansion process, the luminance adjustment unit 222 calculates a luminance value corresponding to the luminance after expansion obtained by multiplying the luminance represented by the luminance value for each pixel by a predetermined expansion rate (for example, 2). The luminance adjustment unit 222 outputs video data indicating the calculated luminance value for each pixel to the display processing unit 223. By this processing, the display unit 22 can display an image with luminance expanded at the expansion rate. A luminance value range (for example, 16 to 240 in the case of 8 bits) that gives a luminance range (for example, 0 to 100 cd / m ² ) of a video displayed as SDR video data, and a conversion that gives the luminance range The range of brightness values in the HDR video data (for example, 64 to 512 in the case of 10 bits) is uniquely associated. Originally, the luminance of the video based on the converted HDR video data should be equal to the luminance based on the SDR video data.

However, the luminance range of the video based on the SDR video data is expanded to a luminance range equivalent to the luminance range (for example, 0 to 200 cd / m ² ) that can be displayed in the receiving device that displays the video based on the conventional SDR video data. As described above, the luminance may be adjusted in the display unit 22. Therefore, unless the luminance expansion process is performed, the luminance of the HDR video based on the converted HDR video data is relatively lower than the luminance of the SDR video based on the SDR video data provided in another program. According to the luminance expansion process described above, the luminance range of the HDR video based on the HDR video data converted to be equal to the luminance range of the SDR video based on the SDR video data is adjusted. Note that the luminance adjusting unit 222 uses the luminance value of HDR data (for example, 510 for 10 bits) corresponding to the maximum value of the luminance value of SDR video data (for example, 240 for 8-bits) as a predetermined expansion rate. A ratio of the maximum luminance value based on the SDR video data to the given luminance may be used.

The luminance adjustment unit 222 may further perform gain adjustment processing on the video data obtained by performing the luminance expansion processing. In the gain adjustment process, the luminance adjustment unit 222 multiplies the luminance value for each pixel by a predetermined gain value. The gain value increases as the luminance value increases. According to the gain adjustment processing, the luminance decreases as the luminance of the video before processing decreases. For example, the luminance adjustment unit 222 multiplies a luminance value (low gradation range) smaller than a predetermined luminance value (for example, 256 in the case of 10 bits) by a gain value smaller than 1, thereby obtaining the predetermined luminance. For a luminance value (high gradation range) larger than the value, the luminance value is maintained (corresponding to a gain value of 1). According to the gain adjustment process, it is possible to suppress the perception of noise mixed in the video and amplified by the extension of luminance. This is because, according to human visual characteristics, the perception of a change in luminance is more sensitive in the dark portion than in the bright portion where the luminance is high. The gain value may be three or more levels as long as the luminance value to be multiplied is larger and smaller as the luminance value is smaller. The luminance adjustment unit 222 may further perform smoothing processing (smoothing) on the video data obtained by performing the video processing or gain adjustment processing obtained by performing the luminance expansion processing. In the smoothing process, the luminance adjustment unit 222 performs, for example, low-pass filtering to pass a component whose spatial frequency is lower than a predetermined cutoff frequency. Since noise components having a high spatial frequency are removed or reduced, perception with respect to noise is suppressed.

In addition, although the case where the above-described luminance expansion processing and gain adjustment processing are processing based on adjustment of luminance values is taken as an example, the present invention is not limited thereto. The luminance adjusting unit 222 may adjust the luminance of the image light emitted for each pixel of the display unit 22. In the luminance expansion process, the luminance adjustment unit 222 may amplify the luminance for each pixel at the expansion rate described above. In the gain adjustment process, the luminance adjustment unit 222 can attenuate the luminance of the pixel having a lower luminance value than the luminance of the pixel having a higher luminance value with respect to the pixel of the display unit 22, as in the video display device described in Japanese Patent No. 4999949. That's fine.

Further, whether or not the luminance expansion processing performed by the luminance adjustment unit 222 is necessary may be set based on a user operation. In the setting, for example, the display information acquisition unit 243 causes the display unit 22 to display a setting screen (not shown) including whether or not the luminance expansion process is necessary as a setting item. When the setting screen is displayed, luminance expansion processing is instructed based on the operation signal input from the input unit 215. Whether or not the luminance expansion processing performed by the luminance adjustment unit 222 is necessary may be determined according to the type (model) of the display used as the display unit 22. Here, the luminance adjustment unit 222 determines that the predetermined model for adjusting the luminance of the SDR video is the luminance expansion process, and performs the luminance expansion process for a model that does not adjust the luminance of the SDR video. Judge that there is no. Note that the gain adjustment process may also be determined according to the user operation or the display model, similar to the luminance expansion process.

Further, the luminance information may further include (6) information on parameters used for conversion from SDR video data to HDR video data. The information (6) includes, for example, the maximum luminance value after conversion or the maximum luminance value. The brightness adjusting unit 222 may perform the above-described brightness conversion process using these pieces of information. When the information (6) is included, the information (1) to (4) may be omitted.

(Modification)
Next, a modification of this embodiment will be described. The service information acquisition unit 140 of the transmission apparatus 10 may generate the service information by including the luminance information in the MPT instead of the MH-EIT. Here, the data structure of MPT will be described. FIG. 10 is a diagram illustrating an example of the data structure of the MPT according to the present modification.
In the example shown in FIG. 10, MPT (MMT_Package_Table ()) stores configuration information indicating the configuration of program data. The MPT includes a version, an MPT descriptor area (MPT_descriptors_byte), and an asset type (asset_type) for each asset. The version indicates an MPT version number. Each time the information stored in the MPT is updated, the version number is updated in ascending order. The MPT descriptor area is an MPT descriptor. In the MPT descriptor, a descriptor related to program data transmitted at that time is described, and a luminance descriptor is described in this modification. Accordingly, the service information processing unit 242 of the receiving device 20 detects the luminance descriptor from the MPT included in the service information, and reads the luminance information described in the detected luminance descriptor. The luminance information is set for each program as described above.

The data structure of the luminance descriptor described in MPT may be the same as the data structure shown in FIG. In the descriptor tag, a descriptor tag different from that shown in FIG. 5, for example, “0xF0” may be described as a tag indicating that the descriptor is a luminance descriptor described in MPT.
The asset type (asset_type) is information indicating the type of asset. An asset means a component of a program. For example, an asset in which “hvc1” is described as the asset type indicates video, and an asset in which “mp4a” is described as the asset type indicates audio.

(Luminance information acquisition processing)
Next, luminance information acquisition processing according to this modification will be described. FIG. 11 is a flowchart showing luminance information acquisition processing according to the present modification. The process shown in FIG. 11 is started after the service information processing unit 242 extracts the MPT from the service information input from the separation unit 212.

(Step S121) The service information processing unit 242 extracts one descriptor from the MPT descriptor area of the extracted MPT. The descriptor extracted at the first time is a descriptor described at the head of the MPT descriptor area. Thereafter, the process proceeds to step S122.
(Step S122) The service information processing unit 242 determines whether or not the descriptor tag described in the descriptor tag (descriptor_tag) of the extracted descriptor matches the tag “0x803A” of the luminance descriptor. When it is determined that they match (YES in step S122), the process proceeds to step S123. When it is determined that they do not match (NO in step S122), the process proceeds to step S124.

(Step S123) The service information processing unit 242 extracts the luminance information described in the extracted luminance descriptor, and outputs the extracted luminance information to the luminance adjusting unit 222. Thereafter, the process shown in FIG.
(Step S124) The service information processing unit 242 determines whether or not the next descriptor exists in the MPT descriptor area. When it is determined that it exists (YES in step S124), the target descriptor is changed to the next descriptor, and the process returns to step S121. When it is determined that it does not exist (step S124 NO), the processing of FIG. 11 is terminated.

Thereafter, the luminance adjustment unit 222 performs the process related to the luminance adjustment described above using the luminance information input from the service information processing unit 242. The process related to the brightness adjustment is, for example, the brightness conversion process shown in FIG.
The MPT stores information indicating the configuration of program data transmitted at that time, so that variable luminance information can be transmitted in each program. For example, let us consider a case where an advertisement program (CM: Commercial Message) is temporarily inserted within the broadcast time of a main program. In this case, the service information acquisition unit 140 of the transmission apparatus 10 changes the luminance information related to the main program to the luminance information of the advertising program at the start of the advertising program, and returns to the luminance information of the main program when the main program is resumed. .

Note that the luminance descriptor may be described in an asset descriptor region (asset_descriptors_byte) related to a video constituting a program in the luminance information, instead of the MPT descriptor region. The service information processing unit 242 performs the process shown in FIG. 11 for the asset descriptor area for each asset instead of the MPT descriptor area. Thereby, when there are a plurality of videos constituting the program, the brightness adjusting unit 222 can specify the video that is the target of the brightness conversion process using the described brightness information.

As described above, the receiving device 20 according to the present embodiment includes the service information processing unit 242 that acquires luminance information related to the first luminance range that is the luminance range of the video of the program based on the service information of the program. In addition, the receiving device 20 adjusts the luminance of the video within the second luminance range from the second luminance range, which is the luminance range in which the display unit 22 can display the video, based on the excess amount of the first luminance range. 222.
With this configuration, an excess amount of the luminance range where the video cannot be displayed is determined based on the luminance information included in the service information of the program, and the luminance of the video is adjusted according to the determined excess amount. Regardless of the situation of the video at that time, the brightness of the video is appropriately adjusted for each program. In addition, the luminance range used for luminance adjustment is easily determined without performing complicated analysis.

In addition, the luminance adjusting unit 222 determines a method for adjusting the luminance of the video based on an excess amount from the maximum value of the second luminance range to the maximum value of the first luminance range.
With this configuration, an appropriate adjustment method is selected in accordance with the excess amount of the luminance range in which the video cannot be displayed, and the video brightness is appropriately adjusted for the entire program using the selected adjustment method.

Further, the luminance adjustment unit 222 selects the compression process as an adjustment method when the excess amount exceeds a predetermined excess amount threshold, and selects the clipping process as the adjustment method when the excess amount does not exceed the predetermined excess amount.
With this configuration, when the excess amount is large, the gradation of the video is maintained by the compression process, and when the excess amount is small, the area limited to the maximum luminance that can be displayed by the clipping process is limited. Adjusted to

Further, the luminance adjustment unit 222 expands the luminance range of the video when the luminance information includes conversion information indicating that the luminance range of the video of the content has been expanded from a narrower predetermined luminance range.
With this configuration, the video of the entire program including conversion information is brightened. When an image in a predetermined luminance range provided by another program is displayed brighter than the standard luminance, the difference in luminance from the image is suppressed or eliminated.

In addition, the luminance adjustment unit 222 decreases the luminance of the portion where the luminance of the video whose luminance range is extended is lower.
With this configuration, noise components that are perceived more prominently in a low luminance region are reduced, so that the quality of the image as a whole can be improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. About the same structure as 1st Embodiment, the same code | symbol is attached | subjected and the description is used.
FIG. 12 is a schematic block diagram showing the configuration of the broadcast system 1 according to the present embodiment. In the example illustrated in FIG. 12, the broadcasting system 1 is a broadcasting / communication cooperation system configured to include a transmitting device 10, a receiving device 20, and a server device 30. The server device 30 is, for example, a server device managed by a broadcaster or a program provider.

The communication transmission line CT is a transmission line for bidirectionally transmitting various data between the server device 30 and the receiving device 20. The communication transmission line CT includes, for example, a wide area communication network such as the Internet or a public wireless communication network. The communication transmission line CT may partially include a local area network (LAN) or a dedicated access network. Note that transmission (or transmission, reception) of various data via the communication transmission path CT may be referred to as “transmission (or transmission, reception) by communication”.

When the server device 30 receives an application request signal from the receiving device 20, the server device 30 transmits an application program (hereinafter referred to as an application) to the receiving device 20 as a response. The application request signal is a signal that indicates a request for the target application. The application is described in a predetermined description language (for example, HTML5), and commands for realizing various functions related to program presentation are described. Examples of application functions will be described later.

The service information acquisition unit 140 (see FIG. 2) of the transmission apparatus 10 according to the present embodiment further acquires application control information, describes information indicating the presence of the acquired application control information in the MPT, and includes the MPT. Generate service information. The application control information includes information for controlling execution such as URL (Uniform Resource Locator) of the server device 30 and application start / stop as application acquisition destination information. The control information is represented, for example, as an application information table (MH-AIT: Application Information Table) having a predetermined data format. In the present embodiment, the application may include an acquisition command for luminance information of the video of the program. The luminance adjusting unit 222 of the receiving device 20 adjusts the luminance of the video using the luminance information acquired by the application. The acquisition command includes, for example, the address of a device in which luminance information is arranged as acquisition destination information and the file name of a data file in which the luminance information is stored. If the application includes luminance information acquisition commands or the application includes luminance information, the luminance descriptor may be omitted in the MH-EIT or MPT.

The application control information and the application also include service information related to the provision of the broadcast service, but are processed as an information unit separate from the MMT-SI. The multiplexing unit 150 further multiplexes the application control information to generate multiplexed data. The separation unit 212 (see FIG. 13) of the reception device 20 further separates the application control information from the multiplexed data input from the decoding unit 211, and outputs the separated application control information to the service information processing unit 242.

(Receiver)
Next, the configuration of the receiving device 20 according to this embodiment will be described. FIG. 13 is a schematic block diagram illustrating a configuration of the receiving device 20 according to the present embodiment.
The receiving device 20 according to this embodiment includes a communication unit 260.
The communication unit 260 outputs various reception data received from the server device 30 connected via the communication transmission path CT to the control unit 240, and transmits various transmission data input from the control unit 240 to the server device 30. To do. The communication unit 260 is, for example, a communication interface.

The service information processing unit 242 further includes an application control unit 244 and an application execution unit 245.
The application control unit 244 acquires an application based on the application control information input from the separation unit 212, and controls processing instructed by a command described in the acquired application. Note that performing the processing instructed by an instruction described in the application is called “execution of application” or “execution of application”.
The application control unit 244 extracts application acquisition destination information from the application control information, and transmits an application request signal to the server device 30 indicated by the extracted acquisition destination information. The application control unit 244 receives an application from the server device 30 as a response, and outputs the received application to the application execution unit 245. The application control unit 244 controls execution of the application in the application execution unit 245 based on various commands included in the application control information.

The application execution unit 245 executes the application input from the application control unit 244. The application execution unit 245 causes other functional units to execute processing related to the presentation of the video indicated by the program data based on a command described in the application. For example, the application execution unit 245 transmits a luminance information request signal to the device instructed by the acquisition command described in the application via the communication unit 260. The application execution unit 245 receives luminance information from the device via the communication unit 260 as a response to the luminance information request signal. Note that brightness information may be described in the application. In that case, the acquisition command may be omitted in the application. The application execution unit 245 causes the luminance adjustment unit 222 to execute the above-described luminance adjustment process based on the acquired luminance information. In addition, the application execution unit 245 may cause the display information acquisition unit 243 to generate a brightness adjustment screen as display information, and cause the display unit 22 to display the generated brightness adjustment screen. Then, the luminance adjustment unit 222 may be caused to execute the luminance adjustment process described above using the luminance range indicated by the operation signal input from the input unit 215. In the following description, the luminance range indicated by the operation signal may be referred to as a user-set luminance range.

(Application control)
Next, an example of application control according to the present embodiment will be described. The application control information includes control information such as a start instruction (AUTOSTART), standby (PRESENT), and termination (KILL). 14 and 15 are diagrams illustrating examples of application control according to the present embodiment, respectively. The example illustrated in FIG. 14 indicates that the application control unit 244 starts execution based on the start instruction and ends execution based on the end instruction for the application 0 that has already been acquired. The application 0 that is instructed to start includes an acquisition command for acquiring luminance information, and includes a provision command for outputting the acquired luminance information to the luminance adjustment unit 222. The time when the application control unit 244 instructs to start is, for example, the later of the start time of the program and the time when the acquisition of the application 0 is completed (the time when reception starts from the middle of the broadcast time). The time when the application control unit 244 instructs to end is, for example, the earlier of the end time of the program or the end of reception of the program during the broadcast time.

The example shown in FIG. 15 indicates that the application control unit 244 starts execution of the already acquired application 1 and waits for execution of the application 2. The application 1 includes a luminance information acquisition command. The application 2 includes a luminance information setting command. The brightness adjustment process based on the execution of the brightness information setting command will be described later. The time when the application control unit 244 instructs to start the application 1 and wait for the application 2 is, for example, the later of the start time of the program and the time when the acquisition of the application is completed. Due to the standby, the application execution unit 245 starts execution of the application 2 when an operation signal is input in response to a user operation. The time when the application control unit 244 instructs to end is, for example, the earlier of the end time of the program or the end of reception of the program in the middle of the broadcast time for both the applications 1 and 2.

The luminance information acquired by executing the application may be associated with time information indicating the start time of luminance adjustment based on the luminance information. As the time information, a time defined by a system clock (STC: System Time Clock) may be used. The STC is a system clock generated by the transmission device 10 for the purpose of synchronization with the operation in the reception device 20. When the MMT method is used as the media transport method, an IP (Internet Protocol) packet that stores multiplexed data in a segmented manner indicates a time based on the system clock as a time stamp in the NTP (Network Time Protocol) format. Time information is notified to the receiving device 20. The brightness adjusting unit 222 can specify the time indicated by the time information associated with the brightness information with reference to the notified time stamp as the time to apply the brightness information. By synchronizing with the video data transmitted from the transmission device 10, it is possible to perform precise brightness adjustment in units of video frames. In the example illustrated in FIG. 16, the luminance adjustment unit 222 uses the luminance (1) from the video after the time specified by STC (1) as luminance information. The luminance adjustment unit 222 uses the luminance (2) from the video after the time specified by STC (2) and the luminance (3) from the video after the time specified by STC (3) for luminance adjustment.

Next, an application control procedure according to the present embodiment will be described.
FIG. 17 is a flowchart illustrating an example of application control according to the present embodiment. The process shown in FIG. 17 is a procedure for realizing the control example shown in FIG.
(Step S131) The application control unit 244 activates the application 0 at the time specified in the application control information input from the separation unit 212, and starts the instructed operation. Thereafter, the process proceeds to step S132.
(Step S132) The application execution unit 245 acquires the luminance information from the acquisition destination described in the application 0 via the network. Thereafter, the process proceeds to step S133.
(Step S133) The application execution unit 245 outputs the acquired luminance information to the luminance adjustment unit 222. Thereafter, the process proceeds to step S134.
(Step S134) The application control unit 244 ends the process described in the application 0. Thereafter, the process shown in FIG.

FIG. 18 is a flowchart illustrating another example of application control according to the present embodiment. The process shown in FIG. 18 is a procedure for realizing the control example shown in FIG.
(Step S141) The application control unit 244 activates the application 1 at the time specified in the application control information input from the separation unit 212, and starts the operation described in the application 1. On the other hand, the application control unit 244 waits for the activation of the application 2 at that time. At this time, the application execution unit 245 may cause the display information acquisition unit 243 to acquire the activation confirmation screen information related to the activation of the application 2 and cause the display unit 22 to display the activation confirmation screen. Thereafter, the process proceeds to step S142.

(Step S142) The application execution unit 245 acquires the luminance information from the acquisition destination described in the application 1 via the network. Thereafter, the process proceeds to step S143.
(Step S143) The application execution unit 245 activates the application 2 when an operation signal instructing activation of the application 2 is input from the input unit 215, and starts the operation described in the application 2. Thereafter, the process proceeds to step S144.

(Step S144) The application execution unit 245 causes the display information acquisition unit 243 to generate a brightness adjustment screen as display information in accordance with the brightness information setting command described in the application 2, and causes the display unit 22 to display the generated brightness adjustment screen. . In response to a user operation, an operation signal indicating the user-set luminance range is input from the input unit 215. Thereafter, the process proceeds to step S145.
(Step S145) The application execution unit 245 outputs luminance range information indicating the user-set luminance range to the luminance adjustment unit 222. The luminance adjustment unit 222 performs luminance adjustment based on the user-set luminance range input from the application execution unit 245. Thereafter, the process proceeds to step S146.

(Step S146) The application control unit 244 ends the operation described in the application 2. Thereafter, the process proceeds to step S147.
(Step S147) The application control unit 244 terminates the processing described in the application 1. Thereafter, the process of FIG. 18 is terminated.

(Application execution example)
Next, an application execution example will be described. FIG. 19 is a diagram illustrating an execution example of an application according to the present embodiment.
FIG. 19A shows an example of an activation confirmation screen (activation confirmation screen Dg01) displayed on the display unit 22 when execution of the application 2 is on standby. In the example shown in FIG. 19A, the activation confirmation screen Dg01 is displayed so as to overlap within a predetermined range from the lower right end of the video of the program. The activation confirmation screen Dg01 displayed at this display position does not significantly disturb the viewing of the program video by the user. On the activation confirmation screen Dg01, character strings “Adjust brightness”, “Yes” button, and “No” button indicating the function of the application 2 are arranged. When the “Yes” button is pressed according to the user's operation, the application execution unit 245 activates the application 2. When the “No” button is pressed and when the x mark at the upper right corner of the activation confirmation screen Dg01 is pressed, the application control unit 244 ends the operation instructed by the application 2. At this time, the application execution unit 245 causes the display processing unit 223 to stop displaying the activation confirmation screen Dg01. Note that “pressing” means obtaining an operation signal indicating a position in the display area from the input unit 215 in accordance with a user operation.

FIG. 19B shows an example of a brightness adjustment screen (brightness adjustment screen Dg02) displayed on the display unit 22 in accordance with the brightness information setting command described in the application 2. In the example shown in FIG. 19B, the brightness adjustment screen Dg02 is displayed so as to overlap within a predetermined range from the lower right end of the video of the program. On the brightness adjustment screen Dg02, three strip-shaped bars Br01, Br02, Br03 and a scroll bar Sc01 whose longitudinal direction is oriented in the horizontal direction are arranged in order from the top to the bottom. The lengths of the bars Br01, Br02, and Br03 indicate the luminance range that can be displayed by the display used as the display unit 22, the luminance range of video provided in broadcasting, and the user-set luminance range, respectively. Directly above the bars Br01, Br02, and Br03, the character strings “panel capability”, “video luminance range”, “post-conversion luminance range”, “video luminance range”, and “user-set luminance range” are displayed. Display range "is displayed. The scroll bar Sc01 is a screen component for setting the user-set luminance range in response to pressing. The arrow at the left end of the scroll bar Sc01 is a screen component for decreasing or increasing the value set as the lower limit of the user-set luminance range when pressed. The arrow at the right end of the scroll bar Sc01 is a screen component for increasing or decreasing the value set as the upper limit of the user-set luminance range when pressed. The knob shown at the center of the scroll bar Sc01 is a screen component for moving and displaying the display position in accordance with the movement when the pressed position moves while being pressed. Both the upper limit and the lower limit of the user-set luminance range changed according to the movement amount are set in parallel. However, the moving direction is limited to the horizontal direction. Accordingly, by operating the scroll bar Sc01, the user sets the luminance range that can be displayed by the display unit 22 while viewing the bar Br01 within the luminance range of the video represented by the bar Br02, and the user-set luminance represented by the bar Br03. A range can be indicated. In the example illustrated in FIG. 19B, the user-set luminance range is limited to the luminance range of the video provided by broadcasting, but may or may not exceed the luminance range that can be displayed by the display unit 22. May be.

In the example shown in FIG. 19, the maximum luminance of the video indicated by the luminance information is updated to the upper limit of the user-set luminance range as a parameter used by the luminance adjustment unit 222 for luminance adjustment. That is, the brightness adjustment unit 222 performs brightness adjustment processing using the upper limit of the user-set brightness range instead of the maximum brightness of the video. In the luminance adjustment processing illustrated in FIG. 9, when the upper limit of the user-set luminance range is larger than the maximum luminance of the display unit 22 by a predetermined excess amount, the luminance adjustment unit 222 performs compression processing. When the upper limit of the set luminance range is larger than the maximum luminance of the display unit 22 and the excess amount from the maximum luminance of the display unit 22 is less than the predetermined excess amount, the luminance adjustment unit 222 performs clipping processing. When the upper limit of the user-set luminance range is smaller than the maximum luminance of the display unit 22, the luminance adjustment unit 222 does not perform conversion processing. Therefore, according to the present embodiment, when the excess amount from the luminance range that can be displayed by the display unit 22 in the user-set luminance range desired by the user is large, the luminance range of the gradation of the entire video is expressed. When the excess amount is small, an image having a quality close to that of the original HDR image is displayed. When the user-set luminance range does not exceed the displayable luminance range, the original HDR video is completely displayed.

(Modification)
Next, a modification of this embodiment will be described.
The application control unit 244 of the receiving device 20 according to this modification transmits the acquired application to a predetermined other device, and controls processing instructed by a command described in the application transmitted by the other device. That is, in this modification, the application control unit 244 controls the execution of the application in other devices instead of executing the application in the application execution unit 245 (for example, FIG. 14, FIG. 15, FIG. 17, FIG. 18). When another device includes a communication unit (not shown), the application control unit 244 may cause the other device to receive the application from the acquisition destination described in the application control information. The communication unit is connected to the server device 30 via the communication transmission line CT and transmits / receives various data. In that case, the communication unit 260 may be omitted in the receiving device 20.

Other devices provide various control information for controlling the presentation of programs received by the reception device 20 to the reception device 20, and realize a control function for displaying various display information related to the presentation of programs from the reception device 20. It functions as a second display. The input unit 215 of the receiving device 20 outputs an operation signal received from another device instead of the remote controller RC to the control unit 240. The input unit 215 is configured as an input / output interface that transmits various types of data from the control unit 240 to other devices. The display information acquisition unit 243 transmits the acquired display information to another device instead of outputting the display information to the display processing unit 223. The other device may be an information device including a display unit that displays visual information and an operation unit that receives an operation input. A touch panel integrated as a display panel that is a display unit and a touch sensor that is an operation unit may be used. The other devices are information devices such as a mobile phone (including a so-called smart phone), a tablet terminal device, and a personal computer. Hereinafter, a case where the other device is the information device 40 is taken as an example.

(Display example)
Next, an execution example of an application according to this modification will be described. In the following description, an operation executed on the information device 40 based on the application 3 is taken as an example. The application 3 is an application received by the information device 40 from the server device 30 via the communication transmission path CT according to an instruction from the application control unit 244 of the receiving device 20.
FIG. 20 is a diagram illustrating an execution example of the application 3 according to the present modification. A touch sensor is installed on almost the entire main surface of the information device 40.
FIG. 20A shows an example of the information display screen. The information display screen illustrated in FIG. 20A is an initial screen that is displayed for the first time after the execution of the application 3 is started. The information display screen shows program information Pg01, receiver information Tm01, and brightness adjustment button Bt01. The program information Pg01 is program information of a program that the receiving device 20 is currently receiving. The program information Pg01 includes a program name, broadcast time, performers, program contents, and luminance information. String indicating the image information "20Cd⇔3000Cd", the minimum value of luminance, a maximum value, indicating that each is ^{20Cd / m 2, 3000Cd / m} 2. In the receiver information Tm01, a character string “$$$$$” indicating the model name of the receiving device 20 and “30Cd” and “2500Cd” are described as character strings indicating the panel performance. String "30Cd", "2500 cd" is the minimum value of luminance that can be displayed the display unit 22, a maximum value, indicating that each is ^{20Cd / m 2, 2500Cd / m} 2. The program information Pg01 is obtained by the service information processing unit 242 of the receiving device 20 extracting from MH-EIT the part of the program provided on the channel that receives the broadcast signal at that time.

The receiver information Tm01 is a part of the device information of the receiving device 20 stored in advance in the storage unit 250. The information device 40 receives the program information Pg01 and the receiver information Tm01 from the application control unit 244 of the receiving device 20 together with the activation instruction of the application 3. The information device 40 generates an information display screen using the program information Pg01 and the receiver information Tm01 in accordance with the information display screen generation instruction described in the application 3. The brightness adjustment button Bt01 is a button for displaying a brightness adjustment screen when pressed. In accordance with the brightness information setting command described in the application 3, the information device 40 executes erasure of the information display screen and display of the brightness adjustment screen in response to pressing of the brightness adjustment button Bt01.

FIG. 20B shows an example of the information display screen. On the information display screen, strip-like bars Br11, Br12, Br13 oriented in the horizontal direction in the longitudinal direction are displayed in order from the top to the bottom in the approximate center of the screen. The lengths of the bars Br11, Br12, and Br13 indicate the luminance range that can be displayed on the display used as the display unit 22, the luminance range of video provided in broadcasting, and the user-set luminance range, respectively. At the bottom of the screen, as a description of the bars Br11, Br12, Br13, a character string “panel” indicating a marker indicating the display mode of each bar, a displayable luminance range, a video luminance range, and a user-set luminance range ”,“ Brightness range of video ”, and“ Display range after conversion ”are displayed. When the position where the bar Br13 is pressed while the left end and the right end are pressed is moved, the display positions of the left end and the right end are moved and displayed along with the movement. In the example shown in FIG. 20B, the lengths of Br12 and Br13 are equal. This indicates that the user-set luminance range is equal to the luminance range of the video. In the example shown in FIG. 20C, the right end of the bar Br13 is moved to the left as compared with the example shown in FIG. This means that the upper limit of the user set luminance range is set smaller. By operating the bar Br13, the user can specify the luminance range that can be displayed while viewing the bar Br11, and the user-set luminance range represented by the bar Br13 within the luminance range of the video represented by the bar Br12. . The information device 40 transmits information on the user-set luminance range set according to the luminance information setting command to the luminance adjustment unit 222 of the receiving device 20. The brightness adjustment unit 222 performs brightness adjustment processing using the upper limit of the user-set brightness range instead of the maximum brightness of the video.

Since the brightness adjustment screen is displayed on the display unit of the information device 40 and is not displayed on the display unit 22, viewing of the video of the program displayed on the display unit 22 is not hindered. Further, setting of luminance information with higher usability is realized by utilizing the operation input function and the information display function provided in the information device 40.

As described above, in the receiving device 20 according to the present embodiment, the service information includes application control information. In addition, the service information processing unit 242 includes an application control unit 244 that controls execution of processing instructed by a predetermined application program based on the application application control information. The application program acquires the luminance information by communication to the reception device 20 or the computer of the information device 40 connected to the reception device 20 and causes the luminance adjustment unit 222 to output the acquired luminance information.
With this configuration, the luminance of the video is adjusted using luminance information acquired by communication based on the application program. Therefore, the user can enjoy an image whose luminance is appropriately adjusted by luminance information provided via communication from a broadcaster or a content provider. Further, by causing the information device 40 to acquire the luminance information, it is possible to avoid the complexity of the function of the receiving device 20 and to allow the user to recognize the luminance adjustment as an additional service in broadcasting.

The application program further includes information on the first luminance range that is the luminance range of the video and a luminance range in which the display unit 22 can display the video on the receiving device 20 or the computer of the other information device 40 connected to the receiving device 20. The information of the second luminance range is displayed. In addition, the application program causes the luminance adjustment unit 222 to output information on the second luminance range instructed according to the user's operation.
With this configuration, the user can set desired and appropriate second luminance range information while viewing the displayed first luminance range information and second luminance range information. The brightness adjustment unit 222 can perform brightness adjustment according to a desired brightness range based on the set second brightness range.

(Third embodiment)
Next, a third embodiment of the present invention will be described. About the same structure as the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is used.

The service information processing unit 242 of the reception device 20 according to the present embodiment acquires master monitor information as service information in addition to the above-described luminance information. The master monitor information is information indicating the display capability of the master monitor to display video. A master monitor is a display device used for production of video data of a program. In the following description, the master monitor and master monitor information may be referred to as production display device and production display capability information, respectively.
As shown in FIG. 21, the master monitor information includes one or both of the maximum luminance and the screen size of the master monitor MM. The maximum luminance is the maximum luminance that can be displayed. The display capability of the master monitor MM, particularly the display device used for producing the HDR video signal is usually higher than the display capability of the display unit of a commercially available receiving device. The service information processing unit 242 outputs the acquired master monitor information to the brightness adjustment unit 222.

The brightness adjustment unit 222 readjusts the brightness of the video data whose brightness has been adjusted by the process related to the brightness adjustment described above by performing the following process.
Here, when the display capability of the master monitor MM is higher than the display capability of the display unit 22, the luminance adjustment unit 222 further increases the luminance of the video related to the video data. Then, the luminance adjustment unit 222 may increase the adjustment amount of the video luminance as the difference between the display capability of the display unit 22 and the display capability of the master monitor MM is larger.

More specifically, the brightness adjustment unit 222 performs the following processing.
(I) When only the screen size of the master monitor MM is instructed in the master monitor information and the screen size of the master monitor MM is larger than the screen size of the display unit 22, the brightness adjustment unit 222, for example, The luminance value after readjustment is calculated by multiplying each luminance value by a predetermined coefficient 1 or more (for example, 1.03 to 1.1).
(Ii) When only the maximum luminance of the master monitor MM is instructed in the master monitor information, and the maximum luminance of the master monitor MM is higher than the maximum luminance of the display unit 22, the luminance adjustment unit 222, for example, sets the luminance value for each pixel. The brightness value after readjustment is calculated by multiplying a predetermined coefficient of 1 or more.

In the master monitor information, both the maximum luminance and the screen size may be indicated as the display capability of the master monitor MM. In each case (iii), (iv), (v), and (vi), the service information processing unit 242 performs processing corresponding to the case.
(Iii) When the screen size of the master monitor MM is larger than the screen size of the display unit 22 and the maximum luminance of the display unit 22 is less than or equal to the maximum luminance of the master monitor MM. For example, the luminance adjustment unit 222 calculates the luminance value after readjustment by multiplying the luminance value for each pixel by a predetermined coefficient 1 or more.
(Iv) When the screen size of the display unit 22 is equal to or smaller than the screen size of the master monitor MM and the maximum luminance of the display unit 22 is higher than the maximum luminance of the master monitor MM. For example, the luminance adjustment unit 222 calculates the luminance value after readjustment by multiplying the luminance value for each pixel by a predetermined coefficient 1 or more.
(V) When the screen size of the master monitor MM is larger than the screen size of the display unit 22 and the maximum luminance of the display unit 22 is higher than the maximum luminance of the master monitor MM. For example, the luminance adjustment unit 222 multiplies the luminance value for each pixel by the coefficient 2 and calculates the luminance value after readjustment. The coefficient 2 may be a value larger than the coefficient 1, for example, 1.06 to 1.2.
(Vi) When the screen size of the display unit 22 is less than or equal to the screen size of the master monitor MM and the maximum luminance of the display unit 22 is less than or equal to the maximum luminance of the master monitor MM. For example, the luminance adjustment unit 222 does not adjust the luminance value for each pixel, and uses the luminance value as the luminance value after readjustment.
The service information processing unit 242 outputs video data indicating the brightness value after readjustment to the display processing unit 223.

In the above-described example, the luminance adjusting unit 222 has adjusted the luminance displayed on the display unit 22 by multiplying the luminance value by a predetermined coefficient. However, the present invention is not limited to this. The luminance adjustment unit 222 operates a predetermined electro-optical transfer function (EOTF) on the luminance value before adjustment, and multiplies the luminance corresponding to the luminance value by a predetermined coefficient to expand the luminance. Thereafter, a predetermined photoelectric transfer function (OETF: Opto-Electronic Transfer Function) may be applied to the expanded luminance to obtain a luminance value corresponding to the expanded luminance.
When the readjusted luminance value is larger than the maximum luminance value related to the maximum luminance that can be displayed by the display unit 22, the service information processing unit 242 uses the readjusted luminance value as the maximum luminance value. The brightness value may be further readjusted so that:

The master monitor information may be multiplexed with a broadcast signal and transmitted as shown in FIG. For example, similar to the luminance information described in the first embodiment, the service information acquisition unit 140 of the transmission device 10 includes master monitor information in the MH-EIT or MPT. The master monitor information may be described in the above-described luminance descriptor or may be described in a separate descriptor. The service information processing unit 242 detects master monitor information included in the MH-EIT or MPT.
The maximum luminance of the master monitor MM may be described in the luminance descriptor in the same format as the above-described maximum luminance value or the maximum luminance value. In the luminance descriptor, the screen size of the master monitor MM is the length of the diagonal line (unit: inch), the horizontal width (unit: cm), the vertical height (unit: cm), and the area (unit). : Cm ² ).

The master monitor information may be transmitted by communication similarly to the luminance information described in the second embodiment. Therefore, an application including master monitor information may be stored in an acquisition destination specified by a predetermined URL of the server device 30.
For example, the application control unit 244 of the service information processing unit 242 detects master monitor information included in the application acquired based on the application control information, and outputs the detected master monitor information to the luminance adjustment unit 222.
Further, the production display capability information may be stored in a device designated by an acquisition command described in an application relating to a broadcast program. The application execution unit 245 of the service information processing unit 242 may acquire a master monitor information as a response from the device by transmitting a master monitor information request signal to the device instructed by the acquisition command. The application execution unit 245 outputs the acquired master monitor information to the brightness adjustment unit 222.

As described above, the service information processing unit 242 acquires master monitor information that is information on video display capability by the master monitor MM used for video production as service information. The luminance adjustment unit 222 further increases the luminance of the video displayed on the display unit 22 when the display capability of the master monitor MM is higher than the video display capability of the display unit 22.
Generally, when the video display capability of the master monitor MM is higher than the video display capability of the display unit 22, even if the luminance of the displayed video is physically the same between the two, the video of the master monitor MM The psychological impression given to the viewer becomes stronger. Therefore, by increasing the brightness of the image displayed on the display unit 22, the intensity of the impression that the image of the display unit 22 gives to the viewer, and the intensity of the impression that the image of the master monitor MM gives to the viewer. You can get closer. Therefore, according to the present embodiment, the difference in the intensity of the impression due to the display ability of the master monitor MM used for video production and the display unit 22 is absorbed.

In addition, the luminance adjustment unit 222 increases the luminance increase amount of the video displayed on the display unit 22 as the difference between the display capability of the display unit 22 and the display capability of the master monitor MM is large.
According to this configuration, the difference in the intensity of the impression that the video gives to the viewer, which tends to increase as the difference between the display capability of the display unit 22 and the display capability of the master monitor MM, is suppressed. Therefore, the difference in impression due to the display capability of the video that can vary depending on the master monitor MM used for video production and the display unit 22 of the receiving device 20 is further absorbed.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiment, and includes design and the like within a range not departing from the gist of the present invention. Each structure demonstrated in the above-mentioned embodiment can be combined arbitrarily.

In the above-described embodiment, the example in which the broadcasting system 1 uses the MMT method as the media transport method has been described. However, the present invention is not limited to this. The broadcast system 1 may use, for example, the MPEG-2 TS system or the RTP (Real-time Transport Protocol) system.
In the above-described embodiment, the luminance adjustment unit 222 compares the second luminance range, which is a luminance range in which the display unit can mainly display an image, with the first luminance range, which is the luminance range of the content image. As a result, the case where the brightness of the content video is adjusted based on the excess amount of the first brightness range from the second brightness range is taken as an example, but the present invention is not limited to this. Depending on the content, the second luminance range may be narrower than the first luminance range. Therefore, the luminance adjustment unit 222 may adjust the luminance of the content video within the second luminance range based on the excess amount of the second luminance range from the first luminance range as a comparison result. In other words, the maximum luminance and the minimum luminance of the adjusted content image may be equal to or less than the maximum luminance and the minimum luminance, respectively, in the second luminance range.

The invention described above can also be implemented in the following manner.
(1) A service information processing unit that acquires luminance information related to a first luminance range that is a luminance range of the video of the content based on service information of the content, and a second luminance that is a luminance range in which the display unit can display the video And a luminance adjusting unit that adjusts the luminance of the video within the second luminance range based on a comparison result between the range and the first luminance range.

(2) The receiving apparatus according to (1), wherein the luminance adjustment unit determines a method for adjusting the luminance of the video based on a comparison result between the maximum value of the second luminance range and the maximum value of the first luminance range.

(3) The luminance adjustment unit selects a compression process as the adjustment method when the comparison result exceeds a predetermined threshold, and selects a clipping process as the adjustment method when the comparison result does not exceed the predetermined threshold ( 2) the receiving device.

(4) When the luminance information includes conversion information indicating that the luminance range of the video of the content is expanded from a narrower predetermined luminance range, the luminance adjustment unit extends the luminance range of the video (1 ) To (3).

(5) The receiving device according to (4), wherein the luminance adjustment unit decreases the luminance as the luminance of the video is lower.

(6) The service information includes information on a video display capability of a production display device that is a display unit used for production of the video, and the luminance adjustment unit is more than the video display capability of the display unit. The receiving apparatus according to any one of (1) to (5), wherein when the display capability of the production display device is higher, the luminance of the image is further increased.

(7) The receiving device according to (6), wherein the luminance adjustment unit increases the luminance increase amount of the video as the difference between the video display capability of the display unit and the video display capability of the production display device increases.

(8) The service information includes application control information, and the service information processing unit includes an application control unit that controls execution of a process instructed by a predetermined application program based on the application control information. The reception of any one of (1) to (7), wherein the reception device or a computer of another device connected to the reception device acquires the luminance information by communication and outputs the luminance information to the luminance adjustment unit apparatus.

(9) The application program displays the information on the first luminance range and the information on the second luminance range on a computer of the receiving device or another device connected to the receiving device,
The receiving device according to (8), wherein the information on the second luminance range instructed according to a user operation is output to the luminance adjusting unit.

(10) A broadcasting system including a transmission device and a reception device, wherein the transmission device transmits content including video and service information of the content, and the reception device transmits video of the content based on the service information. A service information processing unit that acquires luminance information related to the first luminance range that is a luminance range of the first luminance range, and a second luminance range that is a luminance range in which the display unit can display an image, and the first luminance range And a brightness adjusting unit that adjusts the brightness of the video within the second brightness range.

(11) Provided with a second transmission device that transmits the luminance information by communication, the service information includes application control information, and the service information processing unit instructs a predetermined application program based on the application control information An application control unit configured to control execution of processing, wherein the application program acquires the luminance information by communication with a computer of the receiving device or another device connected to the receiving device, and the luminance information is adjusted with the luminance; (10) broadcast system to be output to the part.

In addition, a program for realizing the functions of the transmission device 10, the reception device 20, the server device 30, and the information device 40 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer system. The transmitting device 10, the receiving device 20, the server device 30, and the information device 40 may be realized by causing the information processing device to read and execute the processing. The program is a separate program from the application program described in the second embodiment, but some of the functions may be realized based on the application program. Here, “loading and executing a program recorded on a recording medium into a computer system” includes installing the program in the computer system. The “computer system” here includes an OS and hardware such as peripheral devices. Further, the “computer system” may include a plurality of computer devices connected via a network including a communication line such as the Internet, WAN, LAN, and dedicated line.

Further, the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. As described above, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM. The recording medium also includes a recording medium provided inside or outside that is accessible from the distribution server in order to distribute the program. The code of the program stored in the recording medium of the distribution server may be different from the code of the program that can be executed by the terminal device. That is, the format stored in the distribution server is not limited as long as it can be downloaded from the distribution server and installed in a form that can be executed by the terminal device.

Note that the program may be divided into a plurality of parts, downloaded at different timings, and integrated with the terminal device, or the distribution server for distributing each of the divided programs may be different. Furthermore, a “computer-readable recording medium” refers to a program that holds a program for a certain period of time, such as a volatile memory (eg, RAM) inside a computer system that becomes a server or client when the program is transmitted via a network. It is also included. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

As described above, when a video having a wide luminance range exceeding the capability of the display unit is received, the receiving device and the broadcast system according to the present invention can appropriately adjust the luminance of the video according to the program. .

DESCRIPTION OF SYMBOLS 1 ... Broadcast system, 10 ... Transmission apparatus, 110 ... Coding control part, 120 ... Video coding part, 130 ... Audio | voice coding part, 140 ... Service information acquisition part, 150 ... Multiplexing part, 160 ... Encryption part, DESCRIPTION OF SYMBOLS 170 ... Transmission part, 20 ... Reception apparatus, 22 ... Display part, 23 ... Loudspeaker part, 210 ... Broadcast receiving part, 211 ... Decoding part, 212 ... Separation part, 215 ... Input part, 221 ... Video decoding part, 222 ... Luminance Adjustment unit, 223 ... display processing unit, 231 ... audio decoding unit, 240 ... control unit, 241 ... channel selection unit, 242 ... service information processing unit, 243 ... display information acquisition unit, 244 ... application control unit, 245 ... application execution unit , 250 ... storage section, 260 ... communication section, 30 ... server apparatus, 40 ... information equipment, BT ... broadcast transmission path, BS ... broadcast satellite, CT ... communication transmission path, RC ... control apparatus

Claims (11)

1. A service information processing unit that acquires luminance information related to a first luminance range, which is a luminance range of the video of the content, based on the service information of the content;
   A luminance adjusting unit that adjusts the luminance of the video within the second luminance range based on a comparison result between a second luminance range that is a luminance range in which the display unit can display an image and the first luminance range;
   A receiving device.
2. The receiving apparatus according to claim 1, wherein the luminance adjustment unit determines a method for adjusting the luminance of the video based on a comparison result between the maximum value of the second luminance range and the maximum value of the first luminance range.
3. The brightness adjustment unit selects a compression process as the adjustment method when the comparison result exceeds a predetermined threshold, and selects a clipping process as the adjustment method when the comparison result does not exceed a predetermined threshold. The receiving device described.
4. The luminance adjustment unit extends the luminance range of the video when the luminance information includes conversion information indicating that the luminance range of the video of the content is expanded from a narrower predetermined luminance range. Item 4. The receiving device according to any one of Items 3 to 3.
5. The receiving device according to claim 4, wherein the luminance adjustment unit decreases the luminance in a portion where the luminance of the video is lower.
6. The service information includes information on video display capability of a production display device that is a display unit used for production of the video,
   The luminance adjustment unit further increases the luminance of the video when the video display capability of the production display device is higher than the video display capability of the display unit. The receiving device according to item.
7. The receiving device according to claim 6, wherein the luminance adjustment unit increases the luminance increase amount of the video as the difference between the video display capability of the display unit and the video display capability of the production display device increases.
8. The service information includes application control information,
   The service information processing unit includes an application control unit that controls execution of processing instructed by a predetermined application program based on the application control information.
   The application program acquires the luminance information by communication to a computer of the receiving device or another device connected to the receiving device,
   The receiving device according to any one of claims 1 to 7, wherein the luminance information is output to the luminance adjusting unit.
9. The application program is further transmitted to a computer of the receiving device or another device connected to the receiving device.
   Displaying information on the first luminance range and information on the second luminance range;
   The receiving device according to claim 8, wherein information on the second luminance range instructed according to a user operation is output to the luminance adjusting unit.
10. A broadcasting system comprising a transmitting device and a receiving device,
    The transmitting device transmits content including video and service information of the content;
    The receiving device is:
    A service information processing unit that obtains luminance information related to a first luminance range that is a luminance range of the video of the content based on the service information;
    A luminance adjusting unit that adjusts the luminance of the video within the second luminance range based on a comparison result between a second luminance range that is a luminance range in which the display unit can display an image and the first luminance range;
    A broadcasting system comprising:
11. A second transmitter for transmitting the luminance information by communication;
    The service information includes application control information,
    The service information processing unit includes an application control unit that controls execution of processing instructed by a predetermined application program based on the application control information.
    The application program acquires the luminance information by communication to a computer of the receiving device or another device connected to the receiving device,
    The broadcasting system according to claim 10, wherein the luminance information is output to the luminance adjusting unit.

Images