JP7417444B2 - Video processing device, television receiver, and program - Google Patents

Description

The present invention relates to a video processing device, a television receiver, and a program.

In order to define standard operational guidelines for handling HDR (High Dynamic Range) video in studio program production and program transmission at broadcasting stations, the ``ARIB TR-B43: Operation of Program Production Using High Dynamic Range Video'' "Guidelines" (Non-Patent Document 1) have been formulated. ARIB TR-B43 stipulates that when mapping an SDR (Standard Dynamic Range) signal to an HLG (Hybrid Log-Gamma) signal, 100% SDR signal is assigned to 75% HLG signal level (ARIB (See TR-B43 Chapter 2 2.3 “Reference level for mapping from SDR signal to HLG signal”).

“Operation Guidelines for Program Production Using High Dynamic Range Video”, Radio Industries Association, ARIB TR-B43 1.2 version, revised July 30, 2019

The 75% brightness level of the HDR video converted from the SDR video based on the regulations described in Non-Patent Document 1 is assigned the 100% brightness level of the SDR video before conversion. Therefore, when displaying the converted HDR video, it may be displayed darker than the SDR video before conversion. For example, if a converted HDR video is displayed on a display device that displays the 100% brightness level of both SDR video and HDR video at the same brightness, the image will be lower than when displaying the SDR video before the change. It may appear dark.

In view of the above-mentioned problems, the main purpose of the present disclosure is to provide a video processing device, a television receiver, and a program that can suppress dark displays of programs.

A video processing device according to one aspect of the present disclosure includes a determination unit and a correction unit. The determining unit determines a video format of a program in a television broadcast received by the receiving unit based on program information of the program. The correction section performs gain correction processing to increase the brightness level when the program is displayed on the display section. The video format includes a first video format that has a first resolution, and a second video format that is obtained by converting a pre-conversion video that has a second resolution lower than the first resolution to enlarge the resolution and dynamic range. The correction unit executes the gain correction process when the determination unit determines that the program is in the second video format.

A television receiver according to one aspect of the present disclosure includes the video processing device, the receiving section, and the display section.

A program according to one aspect of the present disclosure causes a computer system to execute a determination process and a gain correction process. In the determination process, the video format of the program in the television broadcast received by the receiving unit is determined based on the program information of the program. In the gain correction process, the brightness level when the program is displayed on the display unit is increased. The video format includes a first video format that has a first resolution, and a second video format that is obtained by converting a pre-conversion video that has a second resolution lower than the first resolution to enlarge the resolution and dynamic range. The gain correction process is executed when it is determined in the determination process that the program is of the second video format.

FIG. 1 is a block diagram of a television receiver including a video processing device according to a first embodiment. FIG. 2 is a diagram showing an example of an electronic program guide. FIG. 3 is an operation flowchart of the video processing device and television receiver same as above.

The embodiments and modified examples described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modified examples. Even other than this embodiment and modifications, various changes can be made according to the design etc. as long as they do not depart from the technical idea of the present disclosure.

(Embodiment 1)
The video processing device 1, television receiver 10, and program according to this embodiment will be described below with reference to FIGS. 1 to 3.

The television receiver 10 of this embodiment is configured to display received television broadcast programs. The television receiver 10 includes a video processing device 1, a receiving section 2, a display section 3, and a speaker 4.

The display unit 3 is, for example, a liquid crystal display. The display unit 3 displays the video of the program based on the video control signal output from the video processing device 1.

The speaker 4 outputs the audio of the program based on the audio control signal output from the video processing device 1.

The receiving unit 2 is configured to receive television broadcast programs distributed by a broadcaster. The receiving section 2 includes a tuner 21. The tuner 21 receives television broadcasts wirelessly or by wire. When radio is used to receive television broadcasts, a radio antenna is connected to the antenna input terminal of the tuner 21 via, for example, an antenna cable. When a wire is used to receive television broadcasting, a termination device for wire communication (for example, optical communication using optical fiber) is connected to the antenna input terminal of the tuner 21 via an antenna cable, for example.

Television broadcasting includes terrestrial broadcasting (terrestrial digital television broadcasting) and satellite broadcasting. Satellite broadcasting includes BS (Broadcasting Satellites) broadcasting, CS (Communication Satellites) broadcasting, new 4K8K satellite broadcasting, and the like. The tuner 21 may support only one of terrestrial broadcasting and satellite broadcasting. Furthermore, the tuner 21 may be compatible with only one of satellite broadcasting, BS/CS broadcasting and 4K8K satellite broadcasting. In this embodiment, the tuner 21 supports new 4K8K satellite broadcasting and receives the new 4K8K satellite broadcasting (television broadcast). Note that the receiving unit 2 may include a plurality of tuners including a terrestrial digital tuner compatible with terrestrial broadcasting and a BS/CS tuner compatible with BS/CS broadcasting.

Here, for programs with a resolution of 4K (3840 x 2160, first resolution) (hereinafter also referred to as 4K programs) distributed by the new 4K8K satellite broadcast, the video format is pure 4K format (first video format). There is a mixture of programs that are based on the converted HLG (Hybrid Log-Gamma) system (second video system).

Video whose video format is pure 4K (hereinafter also referred to as pure 4K video) is video generated using equipment such as a 4K camera, and has a resolution of 4K at the time of generation. In addition, pure 4K video includes video whose dynamic range is HDR (High Dynamic Range, first range) of the HLG method (also referred to as HDR pure 4K video), and video whose dynamic range is SDR (Standard Dynamic Range, first range) that is narrower than HDR. (second range) (also referred to as SDR pure 4K video).

On the other hand, video whose video format is converted HLG video (hereinafter also referred to as converted HLG video) is a dynamic video that converts 2K video (pre-conversion video) whose resolution is 2K (1920 x 1080, second resolution) lower than 4K. This is an image whose range and resolution have been expanded (up-converted). 2K video has a resolution of 2K and a dynamic range of SDR, whereas a converted HLG video has a resolution of 4K and a dynamic range of HDR using the HLG method.

In "ARIB TR-B43 (Version 1.2): Operational Guidelines for Program Production Using High Dynamic Range Video", it is stated that "When mapping SDR signals to HLG signals, 100% SDR signals should be mapped to 75% HLG signal level. ” is stipulated. In other words, the signal level of 100% of the 2K video (SDR signal) corresponds to the signal level of 75% of the HLG video (HLG signal). For example, in 2K video, the signal level corresponding to reference white is 100% (first level), whereas in converted HLG video, the signal level corresponding to reference white is 75% (first level), which is lower than 100%. 2 level). The reference white is a signal level when an image of an illuminated uniform diffuse reflection surface with a brightness rate of 100% is captured under predetermined operating conditions. Further, "%HLG" is a percentage expression of the video signal level normalized to [0:1] by the optical electro transfer function (OETF) of the HLG system.

Multiple frequency bands (channels) are assigned to television broadcasts. Each of the plurality of broadcasters distributes programs using the channel assigned to it. In other words, a television broadcast includes multiple programs. The tuner 21 performs signal processing (e.g., signal extraction, signal amplification, decoding, etc.) on the television broadcast based on any one channel selected from a plurality of channels, thereby processing the selected channel. data corresponding to is output to the video processing device 1.

The data output from the receiving section 2 to the video processing device 1 includes a video signal, an audio signal, etc. of a program corresponding to the selected channel. The signal level of the video signal indicates the brightness level and color information for each pixel. The video processing device 1 causes the display unit 3 to display a program (video) based on the video signal. Note that the detailed configuration of the video processing device 1 will be described later. In the present disclosure, "a program in a television broadcast received by the receiving unit 2" is a program corresponding to a channel selected to be displayed on the display unit 3 from among a plurality of programs included in the television broadcast. In the following description, the "program in the television broadcast received by the receiving unit 2" may be referred to as the "display program."

Additionally, program information is added to television broadcasts. The program information is, for example, SI (Service Information). The program information is information corresponding to each program during a predetermined period (for example, 8 days). The program information includes, for example, information indicating the program name (title and subtitle), broadcast date and time, program content, program attributes, and the like. The program content is, for example, information indicating the program description, genre (eg, movie, sports, anime, news, etc.), performers, and the like. The program attributes are information indicating, for example, the resolution, aspect ratio, frame rate, audio mode, video format, presence or absence of subtitles, etc. of the program. The program information also includes operator information indicating the broadcaster of the program.

The data output from the receiving unit 2 to the video processing device 1 includes program information of a broadcaster corresponding to the selected channel. This program information is stored in, for example, non-volatile memory.

The video processing device 1 displays a video (program) by controlling the display unit 3 based on data from the receiving unit 2 (tuner 21). The video processing device 1 includes a separation section 11 , a display control section 12 , an audio control section 13 , a program guide generation section 14 , a determination section 15 , and a correction section 16 . The video processing device 1 includes, for example, a microcomputer having a processor and a memory. That is, the video processing device 1 is realized by a computer system having a processor and a memory. The processor functions as a separation unit 11, a display control unit 12, an audio control unit 13, a program guide generation unit 14, a determination unit 15, and a correction unit 16 by executing an appropriate program. The program may be pre-recorded in a memory, or may be provided via a telecommunications line such as the Internet, or recorded on a non-transitory recording medium such as a memory card. A processor in a computer system is comprised of one or more electronic circuits including semiconductor integrated circuits (ICs) or large scale integrated circuits (LSIs). The plurality of electronic circuits may be integrated into one chip, or may be provided in a distributed manner over a plurality of chips. A plurality of chips may be integrated into one device, or may be distributed and provided in a plurality of devices. For example, the separation section 11, the display control section 12, the audio control section 13, the program guide generation section 14, the determination section 15, and the correction section 16 may be realized by a plurality of microcomputers.

The separation unit 11 separates video data, audio data, and program information from the output data of the reception unit 2. The separation processing section outputs video data, audio data, and program information to the display control section 12, audio control section 13, and program guide generation section 14, respectively.

The display control unit 12 causes the display unit 3 to display the video of the program by outputting a display control signal generated based on the video data to the display unit 3. Here, the video data of this embodiment includes luminance data (Y) and color difference data (Cb, Cr). The display control unit 12 generates a display control signal by correcting the luminance data included in the video data using a gamma curve (gamma correction). Specifically, if the dynamic range of the video data is HDR based on the HLG method, the display control unit 12 performs gamma correction using the HLG gamma curve. Furthermore, when the dynamic range of the video data is SDR, the display control unit 12 performs gamma correction using the SDR gamma curve. Note that the video data may include RGB color data, and even in this case, brightness data can be calculated from the RGB color data.

The audio control unit 13 causes the audio of the program to be output from the speaker 4 by outputting an audio control signal generated based on the audio data to the speaker 4.

The program guide generation unit 14 generates an electronic program guide (EPG) based on the program information. As shown in FIG. 2, the program guide generation unit 14 generates an electronic program guide by arranging programs in chronological order for each channel (broadcasting company). In the electronic program guide, at least a program name is written in a column (program column) corresponding to each program. FIG. 2 is a part of the electronic program guide of the first broadcasting station (first channel), the second broadcasting station (second channel), and the third broadcasting station (third channel). On the first broadcasting station, the program name is "XX Document" from 7:00 pm to 8:00 pm, the program name is "XXXX News" from 8:00 pm to 9:00 pm, and the program name is "XX Sports" from 9:00 pm to 10:00 pm. will be broadcast. At the second broadcasting station, the program name "XX Variety" is broadcast from 7:00 pm to 9:00 pm, and the program name "XX News" is broadcast from 9:00 pm to 10:00 pm. On the third broadcasting station, the program name ``△△Sports'' will be broadcast from 7:00 pm to 9:00 pm, and ``△△ Drama'' will be broadcast from 9:00 pm to 10:00 pm. The electronic program guide generated by the program guide generation unit 14 is stored in, for example, a nonvolatile memory. Further, the electronic program guide is displayed on the display unit 3 and is used to search for programs currently being broadcast or scheduled to be broadcast.

Further, a logo may be written in the program column depending on the program attributes of the program. The program attributes include items corresponding to logos (logo items). For example, the program attributes include an item indicating the presence or absence of subtitles as a logo item. When the program attribute includes the information "with subtitles", the program guide generation unit 14 displays a logo "character" in the program column. The program attributes also include an item indicating the video format as a logo item. When the program attribute includes information that "the video format is pure 4K", the program guide generation unit 14 displays a "4K" logo L1 (see FIG. 2) in the program column. In the example shown in FIG. 2, the program names of the first broadcasting station are "XX Document", "XX News", "XX Sports", the program name of the second broadcasting station is "XX News", and the third broadcasting station is Each of the program names "△△Sports" is pure 4K, and the logo L1 "4K" is written in each program column. Further, when the program attribute includes information that "HDR pure 4K video" is included, the program guide generation unit 14 displays a logo L2 "HDR" (see FIG. 2) in the program column. In the example shown in Figure 2, the program names of the first broadcasting station, "XX Document," "XX News," and "XX Sports," are all HDR pure 4K, and each program column has the "HDR" logo L2. is listed. There are other logo items in addition to those listed above, such as ``Bilingual broadcast'', ``5.1ch surround broadcast'', ``Rebroadcast'', etc. If applicable, the corresponding logo will be displayed. It will be listed in the program column.

Note that the program information may be transmitted in a text data format, and the program guide generation unit 14 may write the text data in the program column. In this case, the logo may be transmitted in the Kuten code, for example.

Further, in the present embodiment, the program guide generation unit 14 generates an electronic program guide based on program information included in television broadcasts, but the invention is not limited to this. For example, the program guide generation unit 14 may generate an electronic program guide based on program information obtained from a server. In this case, the television receiver 10 includes a communication unit (for example, a communication interface) connectable to an Internet line. The server stores program information of each broadcaster for each television broadcast. The program guide generating section 14 obtains program information from the server via the communication section and the Internet line, and generates an electronic program guide for each television broadcast.

The determining unit 15 performs a determining process of determining the video format of a program (display program) in the television broadcast received by the receiving unit 2 based on the program information of the program. Specifically, the determination unit 15 determines whether the video format of the displayed program is the converted HLG format (second video format) based on the program information. In the determination process, the determining unit 15 refers to the program column corresponding to the displayed program in the electronic program guide generated by the program guide generating unit 14. Then, if the program field includes the logo "4K", the determination unit 15 determines that the video format of the displayed program is the pure 4K format (first video format). Further, if the program column does not include the logo "4K", the determination unit 15 determines that the video format of the displayed program is not the pure 4K format, in other words, the video format of the displayed program is the converted HLG format (second video format). method).

The correction unit 16 executes gain correction processing to increase the brightness level when the display program is displayed on the display unit 3. The gain correction process is a process of increasing the gain of a gamma curve (HLG gamma curve) used when the display control unit 12 generates a display control signal based on video data. Here, "increasing the gain of the HLG gamma curve" means multiplying the HLG gamma curve by one or more coefficients (correction coefficients). When the correction unit 16 executes the gain correction process, the display control unit 12 generates a display control signal using the corrected HLG gamma curve. As a result, the brightness level when the display program is displayed on the display unit 3 increases compared to the case where the gain correction process is not executed.

The correction unit 16 executes a gain correction process based on the result of the determination process by the determination unit 15. The correction unit 16 executes gain correction processing when the determination unit 15 determines that the video format of the displayed program is the converted HLG format. The correction unit 16 does not perform the gain correction process when the determination unit 15 determines that the video format of the displayed program is the pure 4K format, in other words, the video format of the displayed program is not the converted HLG format.

As mentioned above, in the 2K video (pre-conversion video), which is the video before conversion of the converted HLG video, the signal level corresponding to the reference white is 100%, whereas in the converted HLG video, the signal level corresponding to the reference white is 100%. The signal level is 75%. Therefore, the video data of the converted HLG video does not include an area where the brightness level is higher than 75%. Strictly speaking, the 2K video (video before conversion) includes super white whose signal level is slightly higher than the reference white, and the video data of the converted HLG video includes a brightness level greater than 75%. There are cases. The present embodiment will be described on the assumption that the 2K video does not include super white.

In this embodiment, when the video format of the displayed program is the converted HLG format, the display control unit 12 generates a display control signal using the corrected HLG gamma curve. That is, the display control signal may include an area where the brightness level is higher than 75%. This prevents the converted HLG video, which is the displayed program, from being displayed darker than the pure 4K video.

Further, the correction coefficient used in the gain correction process is determined based on the signal level ratio between the 2K video and the converted HLG video. Specifically, the signal level corresponding to the reference white in the 2K video is 100% (first level), and the signal level corresponding to the reference white in the converted HLG video is 75% (second level). The correction coefficient is a ratio value (=1.25) of the first level (100%) to the second level (75%). Therefore, while the upper limit of the brightness level of the converted HLG video is 75%, the upper limit of the brightness level of the display control signal after gain correction processing is 100%. Thereby, the upper limit of the brightness level of the converted HLG video can be made equal to the upper limit of the brightness level of the pure 4K video. Note that in this embodiment, the correction coefficient is set to 1.25, but it may be any value such that the upper limit of the brightness level of the display control signal after gain correction processing is around 100%, and is not limited to 1.25. For example, it may be 1.33.

Next, an example of the operation of the video processing device 1 and the television receiver 10 of this embodiment will be described with reference to FIG. 3.

First, the receiving unit 2 receives television broadcasting (new 4K8K satellite broadcasting) (S1). Then, the receiving unit 2 outputs data corresponding to the selected channel to the video processing device 1. Here, it is assumed that a channel corresponding to a 4K program is selected.

Next, the determination unit 15 performs a determination process of determining the video format of the displayed program based on the program information of the displayed program. In this embodiment, the determination unit 15 refers to the electronic program guide generated by the program guide generation unit 14. Then, the determining unit 15 determines whether or not the logo L1 "4K" is included in the program column corresponding to the displayed program in the electronic program guide (S2). For example, assume that the current time is 7:00 pm, the selected channel is the first channel, and the displayed program is "XX Document" (see FIG. 2). In this case, the determining unit 15 determines that the logo L1 "4K" is included in the program column of the displayed program. That is, the determination unit 15 determines that the video format of the displayed program is the pure 4K format.

If the logo L1 "4K" is included in the program field of the displayed program (S2: Yes), the correction unit 16 does not perform the gain correction process. Furthermore, the display control unit 12 refers to the electronic program guide generated by the program guide generation unit 14. Then, the display control unit 12 determines whether the logo L2 "HDR" is included in the program column corresponding to the displayed program (S3). For example, assume that the current time is 7:00 pm, the selected channel is the first channel, and the displayed program is "XX Document" (see FIG. 2). In this case, the display control unit 12 determines that the "HDR" logo L2 is included in the program column of the displayed program. In other words, the display control unit 12 determines that the displayed program is HDR pure 4K.

When the logo L2 "HDR" is included in the program column of the displayed program (S3: Yes), the display control unit 12 generates a display control signal by gamma-correcting the video data of the displayed program using the HLG gamma curve. (S4). The HLG gamma curve used for gamma correction in this case has not been subjected to gain correction processing by the correction unit 16. The display control unit 12 displays the video of the program on the display unit 3 by outputting the generated display control signal to the display unit 3 (S5).

Further, in step S3, for example, it is assumed that the current time is around 9:00 pm, the selected channel is the second channel, and the displayed program is "XX News" (see FIG. 2). In this case, the display control unit 12 determines that the "HDR" logo L2 is not included in the program column of the displayed program. In other words, the display control unit 12 determines that the displayed program is SDR pure 4K.

If the logo L2 "HDR" is not included in the program column of the displayed program (S3: No), the display control unit 12 generates a display control signal by gamma-correcting the video data of the displayed program using the SDR gamma curve. (S6). The display control unit 12 displays the video of the program on the display unit 3 by outputting the generated display control signal to the display unit 3 (S5).

Further, in step S2, it is assumed that the current time is around 7:00 pm, the selected channel is the second channel, and the displayed program is "XX Variety" (see FIG. 2). In this case, the determination unit 15 determines that the logo L1 "4K" is not included in the program column of the displayed program. That is, the determination unit 15 determines that the video format of the displayed program is the converted HLG format.

If the logo L1 "4K" is not included in the program column of the displayed program (S2: No), the correction unit 16 executes gain correction processing (S7). In the gain correction process, the correction unit 16 generates a corrected HLG gamma curve by multiplying each value of the HLG gamma curve by one or more correction coefficients. The display control unit 12 generates a display control signal by gamma-correcting the video data of the display program using the corrected HLG gamma curve (S8). Then, the display control unit 12 displays the video of the program on the display unit 3 by outputting the generated display control signal to the display unit 3 (S5).

In this way, the video processing device 1 and the television receiver 10 of this embodiment perform a determination process to determine whether the video format of the displayed program is the converted HLG format. Then, when the video format of the displayed program is the converted HLG format, gain correction processing is performed to increase each value of the HLG gamma curve. This prevents the converted HLG video, which is the displayed program, from being displayed darker than the pure 4K video. Further, when the video format of the displayed program is a pure 4K format, gain correction processing is not performed, so saturation of the brightness level (so-called white spotting) is suppressed.

In addition, in the determination process, the video format of the displayed program is determined based on the program information of the displayed program, so the processing load and determination time can be reduced compared to, for example, video analysis. .

Furthermore, in the present embodiment, the determining unit 15 determines the video format of the displayed program based on the electronic program guide. In the electronic program guide, a program guide for a predetermined period is generated in advance. Therefore, even before the program is displayed, the video format of the program can be determined in advance. This eliminates the need to perform determination processing, for example, when switching channels or switching programs, and the gamma curve to be used can be determined in advance.

Furthermore, in the present embodiment, the determination unit 15 determines the video format by searching for the "4K" logo L1 in the program column, which further reduces the processing load of the determination process and reduces the determination time. Can be shortened.

Functions similar to those of the video processing device 1 of this embodiment may be realized by a video processing method, a (computer) program, a non-temporary recording medium on which the program is recorded, or the like.

The video processing method includes a determination process and a gain correction process. In the determination process, the video format of the program in the television broadcast received by the receiving unit 2 is determined based on the program information of the program. In the gain correction process, the brightness level when the program is displayed on the display unit 3 is increased. The video format includes a first video format that has a first resolution, and a second video format that is obtained by converting a pre-conversion video that has a second resolution lower than the first resolution to enlarge the resolution and dynamic range. The gain correction process is executed when it is determined in the determination process that the program is of the second video format.

The program causes the computer system to perform the video processing method.

(Modified example)
Hereinafter, a modification of the video processing device 1 of this embodiment will be described. In the following description, the same components as in the embodiment described above will be given the same reference numerals and the description will be omitted as appropriate. Further, the modified examples described below can be applied in appropriate combination with the embodiments described above or other modified examples.

(First modification)
In the example described above, the determining unit 15 determines whether the video format of the displayed program is the converted HLG format based on the presence or absence of the "4K" logo L1 in the program column of the displayed program. The method is not limited to this.

In this modification, the determining unit 15 determines whether the video format of the displayed program is the converted HLG format based on the broadcaster distributing the displayed program.

The program information includes broadcaster information indicating the broadcaster. The program guide generation unit 14 writes broadcast operators (first broadcast station, second broadcast station, third broadcast station, etc.) in the electronic program guide (see FIG. 2) based on the operator information.

In the determination process, the determination unit 15 refers to the broadcaster of the displayed program in the electronic program guide. Then, the determination unit 15 determines whether the broadcaster is a public service provider. Broadcasting businesses include public businesses and private businesses. A public service provider is a broadcasting company that conducts television broadcasting as a public broadcaster. For example, the public service provider in Japan is the Japan Broadcasting Corporation (NHK). A private operator is a broadcaster that conducts private broadcasting as television broadcasting. In Japan, the video format of programs distributed by the public service provider (NHK) is the pure 4K format (first video format). On the other hand, only some of the video formats of programs distributed by private businesses are pure 4K format, and most of them are converted HLG format (second video format).

In this modified example, it is assumed that the first broadcasting station (see FIG. 2) is a public service provider. The determining unit 15 determines that the video format of the displayed program is the pure 4K format when the broadcaster of the displayed program is the first broadcasting station (public utility). In this case, the correction unit 16 does not perform gain correction processing. Therefore, the display unit 3 displays an image based on a display control signal generated using the HLG gamma curve or the SDR gamma curve.

In addition, when the broadcaster of the displayed program is a different broadcaster (for example, a second broadcasting station or a third broadcasting station) than the first broadcasting station (public utility), the determination unit 15 determines whether the video of the displayed program is It is determined that the method is the conversion HLG method. In this case, the correction unit 16 executes gain correction processing. Therefore, the display unit 3 displays an image based on the display control signal generated using the corrected HLG gamma curve.

In this way, in this modification, the determining unit 15 determines whether the video format of the displayed program is the converted HLG format based on the broadcaster of the displayed program. Therefore, it is possible to reduce the processing load of the determination process by the determination unit 15 and shorten the determination time.

In addition, in the example mentioned above, the determination unit 15 refers to the electronic program guide to determine whether or not the broadcaster is a public service provider, but the determination method is not limited to this. Broadcasting companies correspond to channels. Specifically, broadcasters and channels are associated in advance based on program information received in the past. The determination unit 15 determines whether the broadcaster of the displayed program is a public utility by determining whether the channel of the displayed program is a channel associated with a public utility. For example, when the channel of the displayed program is the first channel (see FIG. 2), the determination unit 15 determines that the broadcaster of the displayed program is a public service provider. Furthermore, when the channel of the displayed program is the second channel (see FIG. 2), the determining unit 15 determines that the broadcaster of the displayed program is a private operator. In this case, since the determination unit 15 does not need to refer to the electronic program guide, it is possible to reduce the processing load of the determination process and shorten the determination time.

(Second modification)
In the example described above, the correction unit 16 corrects the HLG gamma curve in the gain correction process using a constant correction coefficient regardless of the brightness level, but the invention is not limited to this. The correction unit 16 may perform gain correction processing (hereinafter also referred to as variable gain correction processing) for correcting the HLG gamma curve using different correction coefficients depending on the brightness level. For example, in the variable gain correction process, the correction unit 16 sets the correction coefficient to 1 or less (for example, 0.9) in the low gradation area of the brightness level, and sets the correction coefficient to 1 in the middle to high gradation area of the brightness level. 1.3, the HLG gamma curve is corrected. Thereby, a sharp video with coordinated contrast can be displayed on the display unit 3. Note that the values of the correction coefficients described above are merely examples, and are not limited to the above numerical values.

Further, the correction unit 16 may perform the above-described variable gain correction processing depending on the video mode. The video mode is a mode in which video is displayed with preset parameters (image quality). The video modes include, for example, standard mode, dynamic mode, game mode, etc., and different parameters are set for each mode. In this modification, different gamma curves (HLG gamma curves) are set for each video mode.

For example, when the video mode is the standard mode, the correction unit 16 executes normal gain correction processing using a fixed correction coefficient. Further, when the video mode is a dynamic mode that emphasizes contrast, the correction unit 16 executes variable gain correction processing on the HLG gamma curve corresponding to the dynamic mode. Thereby, when the video mode is the dynamic mode, the contrast of the video displayed on the display unit 3 can be further emphasized.

Further, the correction unit 16 may perform the above-described variable gain correction processing depending on the genre of the displayed program. The program information includes genre information indicating the genre of the program. The genre of the program is, for example, movies, sports, news, etc. If there is a logo corresponding to the genre of the program, the program guide generation unit 14 may display this logo in the program column. The correction unit 16 refers to the electronic program guide to confirm the genre of the displayed program.

For example, when the genre of the displayed program is a movie, the correction unit 16 executes normal gain correction processing using a certain correction coefficient. Thereby, the image can be displayed on the display unit 3 without destroying the gradation of the luminance data included in the image data, and the image quality of the original image can be reproduced. Furthermore, when the genre of the displayed program is sports, the correction unit 16 executes the variable gain correction process described above. Thereby, when the genre of the displayed program is sports, the contrast of the video displayed on the display section 3 can be further emphasized.

(Other variations)
In the above example, the video processing device 1 is applied to the television receiver 10, but the video processing device 1 can be applied to, for example, a set-top box, a personal computer, a mobile terminal such as a smartphone, etc. be.

1 Video processing device 10 Television receiver 15 Judgment section 16 Correction section 2 Receiving section 3 Display section L1 Logo

Claims (13)

a determining unit that determines a video format of a program in a television broadcast received by the receiving unit based on program information of the program;
a correction unit that performs gain correction processing to increase the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The correction unit executes the gain correction process when the determination unit determines that the program is in the second video format,
The program information includes information for displaying an electronic program guide on the display unit,
When the program information includes information for displaying a logo indicating that the video format is pure 4K in a column corresponding to the program in the electronic program guide, the determination unit determines that the program is 1 video format.
Video processing device. the logo includes the text 4K;
The video processing device according to claim 1. a determining unit that determines a video format of a program in a television broadcast received by the receiving unit based on program information of the program;
a correction unit that performs gain correction processing to increase the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The correction unit executes the gain correction process when the determination unit determines that the program is in the second video format,
The program information includes information for displaying an electronic program guide on the display unit,
The determining unit determines the video format of the program based on the electronic program guide,
The determining unit determines that the program is of the first video format when a “4K” logo is included in a column corresponding to the program in the electronic program guide .
Video processing device. the program information is included in the television broadcast;
The video processing device according to any one of claims 1 to 3 . The program information includes operator information indicating a broadcaster distributing the program,
The determination unit determines the video format of the program based on the vendor information.
The video processing device according to any one of claims 1 to 4. a determining unit that determines a video format of a program in a television broadcast received by the receiving unit based on program information of the program;
a correction unit that performs gain correction processing to increase the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The correction unit executes the gain correction process when the determination unit determines that the program is in the second video format,
The program information includes operator information indicating a broadcaster distributing the program,
The determining unit determines the video format of the program based on the vendor information,
The determining unit determines that the program is in the first video format when the broadcasting business is a public broadcasting business that provides public broadcasting .
Video processing device. The said vendor information is included in the said television broadcast,
The video processing device according to claim 5 or 6. In the pre-conversion video, a signal level corresponding to reference white is a first level,
In the second video system, the signal level corresponding to the reference white is a second level lower than the first level,
In the gain correction process, the correction unit multiplies the value of the gamma curve by using a value of the ratio of the first level to the second level as a correction coefficient.
The video processing device according to any one of claims 1 to 7. The dynamic range of the video before conversion is SDR,
The second video format is an HLG format,
the first level is 100%,
the second level is 75%;
The video processing device according to claim 8. The video processing device according to any one of claims 1 to 9,
the receiving section;
The display unit,
TV receiver. A program for causing a computer system to execute determination processing and gain correction processing,
In the determination process, a video format of a program in a television broadcast received by a receiving unit is determined based on program information of the program,
The gain correction process increases the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The gain correction process is executed when it is determined in the determination process that the program is in the second video format ,
The program information includes information for displaying an electronic program guide on the display unit,
In the determination process, if the program information includes information for displaying a logo indicating that the video format is pure 4K in the column corresponding to the program in the electronic program guide, the program is 1 video format.
program. A program for causing a computer system to execute determination processing and gain correction processing,
In the determination process, a video format of a program in a television broadcast received by a receiving unit is determined based on program information of the program,
The gain correction process increases the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The gain correction process is executed when it is determined in the determination process that the program is in the second video format,
The program information includes information for displaying an electronic program guide on the display unit,
In the determination process, the video format of the program is determined based on the electronic program guide;
In the determination process, if a "4K" logo is included in a column corresponding to the program in the electronic program guide, it is determined that the program is of the first video format.
program. A program for causing a computer system to execute determination processing and gain correction processing,
In the determination process, a video format of a program in a television broadcast received by a receiving unit is determined based on program information of the program,
The gain correction process increases the brightness level when the program is displayed on the display unit,
The video method is
a first video method having a first resolution;
a second video method in which a pre-conversion video having a second resolution lower than the first resolution is converted to enlarge resolution and dynamic range;
The gain correction process is executed when it is determined in the determination process that the program is in the second video format,
The program information includes operator information indicating a broadcaster distributing the program,
In the determination process, the video format of the program is determined based on the vendor information,
In the determination process, if the broadcaster is a public service provider that provides public broadcasting, it is determined that the program is in the first video format.
program.

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