JP2021150766A - Video processing device, television receiver, and program - Google Patents

Abstract

To provide a video processing device, a television receiver, and a program that can suppress that a program is displayed darkly.SOLUTION: A video processing device includes a determination unit and a correction unit. The determination unit determines the video system of a program in the television broadcast received by a reception unit. The correction unit performs a gain correction process for increasing the brightness level when the program is displayed on a display unit. The video system includes a first video system having a first resolution and a second video system in which a pre-conversion video having a second resolution lower than the first resolution is expanded and converted in a resolution and a dynamic range. When the program is a simulcast program distributed by simulcast, the determination unit determines that the program is created in the second video system. When the determination unit determines that the program is created in the second video system, the correction unit executes the gain correction process.SELECTED DRAWING: Figure 1

Description

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

In order to specify standard operation guidelines when handling HDR (High Dynamic Range) video in studio program production and program transmission at broadcasting stations, "ARIB TR-B43: Operation of program production using high dynamic range video" "Guidelines" (Non-Patent Document 1) have been formulated. The 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 a 75% HLG signal level (ARIB). TR-B43 See Chapter 2.3, “Reference Levels in Mapping SDR Signals to HLG Signals”).

"Operational Guidelines for Program Production Using High Dynamic Range Video", Association of Radio Industries and Businesses, ARIB TR-B43 1.2 Edition, revised on July 30, 2019

The brightness level of 75% of the HDR video converted from the SDR video based on the provisions described in Non-Patent Document 1 is assigned to the brightness level of 100% 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, when the converted HDR image is displayed on a display device that displays 100% brightness level of each of the SDR image and the HDR image with the same brightness, the image is displayed more than when the SDR image before the change is displayed. It may be displayed dark.

In view of the above-mentioned problems, a main object of the present disclosure is to provide a video processing device, a television receiver, and a program capable of suppressing the display of a program in a dark manner.

The video processing apparatus according to one aspect of the present disclosure includes a determination unit and a correction unit. The determination unit determines the video system of the program in the television broadcast received by the reception unit. The correction unit performs a gain correction process that increases the brightness level when the program is displayed on the display unit. The video system includes a first video system having a first resolution and a second video system in which a pre-conversion video having a second resolution lower than the first resolution is expanded and converted in resolution and dynamic range. When the program is a simulcast distributed by simulcast, the determination unit determines that the program is the second video system. When the determination unit determines that the program is the second video system, the correction unit executes the gain correction process.

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

The 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 system of the program in the television broadcast received by the receiving unit is determined. In the gain correction process, the brightness level when the program is displayed on the display unit is increased. The video system includes a first video system having a first resolution and a second video system in which a pre-conversion video having a second resolution lower than the first resolution is expanded and converted in resolution and dynamic range. In the determination process, when the program is a simulcast distributed by simulcast, it is determined that the program is the second video system. The gain correction process is executed when the determination process determines that the program is the second video system.

FIG. 1 is a block diagram of a television receiver including the video processing device according to the first embodiment. FIG. 2 is a diagram showing an example of the first electronic program guide. FIG. 3 is a diagram showing an example of the second electronic program guide. FIG. 4 is an operation flowchart of the video processing device and the television receiver of the same.

The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Even if it is not the embodiment and the modified example, various changes can be made according to the design and the like as long as it does not deviate from the technical idea of the present disclosure.

(Embodiment 1)
Hereinafter, the video processing device 1, the television receiver 10, and the program according to the present embodiment will be described with reference to FIGS. 1 to 4.

The television receiver 10 of the present embodiment is configured to display a received television broadcast program. The television receiver 10 includes a video processing device 1, a receiving unit 2, a display unit 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 sound of the program based on the sound control signal output from the video processing device 1.

The receiving unit 2 is configured to receive a television broadcast program distributed by a broadcasting company. The receiving unit 2 includes a first tuner 21 and a second tuner 22. The first tuner 21 and the second tuner 22 receive television broadcasts wirelessly or by wire. When wireless is used for receiving television broadcasting, a wireless antenna is connected to the antenna input terminals of the first tuner 21 and the second tuner 22 via, for example, an antenna cable. When wired is used to receive television broadcasts, the antenna input terminals of the first tuner 21 and the second tuner 22 have, for example, a terminal device for wired communication (for example, optical communication using an optical fiber) via an antenna cable. Be connected.

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 first tuner 21 and the second tuner 22 may support only one of terrestrial broadcasting and satellite broadcasting. Further, the first tuner 21 and the second tuner 22 may support only one of the BS / CS broadcasting and the 4K8K satellite broadcasting among the satellite broadcasting. In the present embodiment, the first tuner 21 supports the new 4K8K satellite broadcast and receives the new 4K8K satellite broadcast (first television broadcast). The second tuner 22 supports BS / CS broadcasting and receives BS / CS broadcasting (second television broadcasting). The receiving unit 2 may include a plurality of tuners including a terrestrial digital tuner that supports terrestrial broadcasting.

Here, for a program having a resolution of 4K (3840 x 2160, first resolution) (hereinafter, also referred to as a 4K program) delivered by the new 4K8K satellite broadcast, the video system is the pure 4K system (first video system). A program that is a conversion HLG (Hybrid Log-Gamma) system (second video system) is mixed.

An image whose image system is a pure 4K system (hereinafter, also referred to as a pure 4K image) is an image generated by 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 (also referred to as HDR pure 4K video) whose dynamic range is HDR (High Dynamic Range, first range) of the HLG system, and SDR (Standard Dynamic Range,) whose dynamic range is narrower than HDR. The image (also referred to as SDR pure 4K image) which is the second range) is mixed.

On the other hand, the video whose video format is the conversion HLG method (hereinafter, also referred to as the converted HLG video) is a dynamic 2K video (pre-conversion video) whose resolution is lower than 4K and is 2K (1920 × 1080, second resolution). This is an image in which the range and resolution are enlarged and converted (up-converted). The 2K video has a resolution of 2K and a dynamic range of SDR, whereas the converted HLG video has a resolution of 4K and a dynamic range of HDR of the HLG system.

In "ARIB TR-B43 (1.2 version): Operation guideline for program production using high dynamic range video", "When mapping SDR signal to HLG signal, 100% SDR signal is 75% HLG signal level. Allocate to. " That is, 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 the 2K video, the signal level corresponding to the reference white is 100% (first level), whereas in the converted HLG video, the signal level corresponding to the reference white is 75% (first level) lower than 100%. 2 levels). The reference white is a signal level when an image is taken on a uniformly diffuse reflection surface having a brightness rate of 100% illuminated under predetermined operating conditions. Further, "% HLG" is a percentage notation of the video signal level normalized to [0: 1] by the optical electro transfer function (OETF) of the HLG system.

Programs distributed by BS / CS broadcasting have a resolution of 2K. Hereinafter, programs distributed by BS / CS broadcasting are also referred to as 2K programs. The video of the 2K program is the above-mentioned 2K video.

Here, when one broadcaster distributes a program having the same content on different television broadcasts, it is called simulcast. For example, in simulcast, programs with the same content are distributed by the new 4K8K satellite broadcasting and BS / CS broadcasting. In the following description, a program distributed by simulcast is also referred to as a simulcast program. In the new 4K8K satellite broadcasting, the video of the program whose video system is the conversion HLG system (converted HLG video) is an up-converted video of the 2K program of BS / CS broadcasting (2K video). That is, in the new 4K8K satellite broadcasting, the program whose video system is the conversion HLG system is a simul program having the same content as the program (2K program) distributed by BS / CS broadcasting.

A plurality of frequency bands (channels) are assigned to television broadcasting. Each of the plurality of broadcasters distributes the program using the channel assigned to them. That is, the television broadcast includes a plurality of programs. The first tuner 21 and the second tuner 22 perform signal processing (for example, signal extraction, signal amplification, decoding, etc.) for television broadcasting based on any one of a plurality of channels selected. As a result, the data corresponding to the selected channel is output to the video processing device 1.

The data output from the receiving unit 2 to the video processing device 1 includes a video signal, an audio signal, and the like of the program corresponding to the selected channel. The signal level of the video signal indicates the brightness level for each pixel, color information, and the like. The video processing device 1 displays a program (on the display unit 3) based on a video signal from any one of the plurality of tuners (first tuner 21, second tuner 22) included in the receiving unit 2. Video) is displayed. In the present embodiment, it is assumed that the first tuner 21 is selected and the display unit 3 displays a 4K program. The detailed configuration of the video processing device 1 will be described later. In the present disclosure, the "program in the television broadcast received by the receiver 2" is a program corresponding to the channel selected to be displayed on the display unit 3 among the 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 a "display program".

In addition, program information is added to the television broadcast. The program information is, for example, SI (Service Information). The program information is information corresponding to each program in a predetermined period (for example, 8 days). The program information includes, for example, information indicating a program name (title and subtitle), broadcast date and time, program content, program attributes, and the like. The program content is, for example, information indicating a description of the program, a genre (for example, a movie, sports, animation, news, etc.), a performer, and the like. The program attribute is, for example, information indicating the resolution, aspect ratio, frame rate, audio mode, video system, presence / absence of subtitles, etc. of the program. In addition, the program information includes business information indicating a broadcaster of the program.

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

The video processing device 1 displays a video (program) by controlling the display unit 3 based on the data from the receiving unit 2. The video processing device 1 includes 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. The video processing device 1 is composed of, 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. Then, when the processor executes an appropriate program, it functions as a separation unit 11, a display control unit 12, a voice control unit 13, a program guide generation unit 14, a determination unit 15, and a correction unit 16. The program may be pre-recorded in a memory, may be recorded through a telecommunication line such as the Internet, or may be recorded and provided on a non-temporary recording medium such as a memory card. A processor in a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. The plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. For example, the separation unit 11, the display control unit 12, the voice control unit 13, the program guide generation unit 14, the determination unit 15, and the correction unit 16 may be realized by a plurality of microcomputers.

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

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

The voice control unit 13 outputs the sound of the program from the speaker 4 by outputting the voice control signal generated based on the voice data to the speaker 4.

The program guide generation unit 14 generates an electronic program guide (EPG: Electronic Programming Guide) based on the program information. As shown in FIGS. 2 and 3, the program guide generation unit 14 generates an electronic program guide by arranging programs in chronological order for each channel (broadcaster). In the electronic program guide, at least the program name is described in the column (program column) corresponding to each program. The program guide generation unit 14 generates an electronic program guide for each television broadcast. In the present embodiment, the program guide generation unit 14 provides a first electronic program guide (see FIG. 2) corresponding to the new 4K8K satellite broadcasting and a second electronic program guide (FIG. 3) corresponding to BS / CS broadcasting. Generate. The program guide generation unit 14 generates the first electronic program guide based on the program information from the first tuner 21, and generates the second electronic program guide based on the program information from the second tuner 22.

FIG. 2 is a part of the program table of the first broadcasting station (channel 1), the second broadcasting station (channel 2), and the third broadcasting station (channel 3) in the first electronic program table. At the first broadcasting station, the program name "OO Document" from 7:00 pm to 8:00 pm, the program name "OO News" from 8:00 pm to 9:00 pm, and the program name "OO Sports" from 9:00 pm to 10:00 pm Will be broadcast. At the second broadcasting station, the program name "XX Variety" will be broadcast from 7:00 pm to 9:00 pm, and the program name "XX News" will be broadcast from 9:00 pm to 10:00 pm. 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 on the third broadcasting station.

FIG. 3 is a part of the program table of the first broadcasting station (channel 1), the second broadcasting station (channel 2), and the third broadcasting station (channel 3) in the second electronic program table. At the first broadcasting station, the program name "OO movie" will be broadcast from 7:00 pm to 9:00 pm, and the program name "OO drama" will be broadcast from 9:00 pm to 10:00 pm. At the second broadcasting station, the program name "XX Variety" will be broadcast from 7:00 pm to 9:00 pm, and the program name "XX Document" will be broadcast from 9:00 pm to 10:00 pm. The program name "△△ News" is broadcast from 7:00 pm to 8:00 pm, the program name "△△ Document" is broadcast from 8:00 pm to 9:00 pm, and "△△ Drama" is broadcast from 9:00 pm to 10:00 pm on the third broadcasting station. Will be done.

As shown in FIGS. 2 and 3, the second broadcasting station distributes the same program (XX variety) between the new 4K8K satellite broadcasting and BS / CS broadcasting from 7:00 pm to 9:00 pm. ing. In addition, the third broadcasting station distributes the same program (△△ drama) on the new 4K8K satellite broadcasting and BS / CS broadcasting from 9:00 pm to 10:00 pm. That is, the program name "XX Variety" and the program name "△△ Drama" are simulcast programs that are simulcast by the new 4K8K satellite broadcasting and BS / CS broadcasting.

Here, each broadcaster uses the channel assigned to itself to distribute the program information of the program to be distributed by itself. Therefore, the program guide generation unit 14 can acquire the program information of the broadcaster corresponding to the selected channel and generate the electronic program guide of the broadcaster. However, the program guide generation unit 14 may not be able to acquire the program information of the broadcaster corresponding to the non-selected channel, and may not be able to generate the electronic program guide of the broadcaster. Therefore, in the present embodiment, when the television receiver 10 performs a power operation (including an operation of the power button of the remote controller) for turning on / off the display operation of the display unit 3, the program guide generation unit 14 electronically operates. Acquire program information of a broadcaster that does not generate a program guide. Specifically, when the display unit 3 is turned off in the power operation, the channels are sequentially switched to the channels of the broadcasters for which the electronic program guide is not generated, and the program guide generation unit 14 outputs the program information of each broadcaster. Acquire and generate an electronic program guide for each broadcaster. The receiving unit 2 includes a plurality of tuners, and the program guide generation unit 14 may generate an electronic program guide of each broadcasting company by using a tuner not used for display.

The first electronic program guide and the second electronic program guide generated by the program guide generation unit 14 are stored in, for example, a non-volatile memory. Further, the first electronic program guide and the second electronic program guide are displayed on the display unit 3 and are used for searching programs being broadcast or scheduled to be broadcast. In the first electronic program guide and the second electronic program guide shown in FIGS. 2 and 3, the notation of the broadcaster and the channel number are the same, but they may be different from each other.

In addition, a logo may be described in the program column according to the program attribute of the program. The program attribute includes an item (logo item) corresponding to the logo. For example, the program attribute includes 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 the logo "character" in the program column. In addition, the program attribute includes an item indicating a video system as a logo item. When the program attribute includes the information that "the video system is pure 4K", the program guide generation unit 14 displays the logo L1 (see FIG. 2) of "4K" in the program column. In the example shown in FIG. 2, the program names of the first broadcasting station "○○ document", "○○ news", "○○ sports", the program name of the second broadcasting station "XX news", and the third broadcasting station Each of the program names "△△ sports" of is pure 4K, and the logo L1 of "4K" is described in each program column. Further, when the program attribute includes the information "HDR pure 4K video", the program guide generation unit 14 displays the logo L2 (see FIG. 2) "HDR" in the program column. In the example shown in FIG. 2, each of the program names "○○ Document", "○○ News", and "○○ Sports" of the first broadcasting station is HDR pure 4K, and the logo L2 "HDR" is displayed in each program column. Is described. There are other logo items besides the above, such as "Bilingual broadcasting", "5.1ch surround broadcasting", "Rebroadcasting", etc., and if applicable, the corresponding logo is available. Described in the program column.

The program information is transmitted in the text data format, and the program guide generation unit 14 may display the text data in the program column. In this case, the logo may be transmitted by, for example, a ward code.

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

The determination unit 15 performs a determination process for determining the video system of the program (display program) in the television broadcast received by the reception unit 2. Specifically, the determination unit 15 performs determination processing when the display program is a 4K program distributed by the new 4K8K satellite broadcast. The determination process includes a program determination process for determining whether or not the displayed program is a simul program. In the program determination process, the determination unit 15 compares the first electronic program guide of the new 4K8K satellite broadcast with the second electronic program guide of the BS / CS broadcast. When the description in the program column of the displayed program in the first electronic program guide is included in the second electronic program guide, the determination unit 15 determines that the displayed program is a simul program. For example, the determination unit 15 refers to a program column (also referred to as a reference program column) in the same time zone as the displayed program of the same broadcaster as the displayed program in the second electronic program table. Then, when the same program name or program content as the displayed program is described in the reference program column, the determination unit 15 determines that the displayed program is a simul program. The term "same description" as used herein is not limited to the case where the description is exactly the same, as long as it can be judged to be substantially the same, and includes the case where some descriptions are different. Further, the determination unit 15 determines that the displayed program is not a simul program when the same program name and program content as the displayed program is not described in the reference program column. In the present embodiment, the determination unit 15 refers to the program column of the same broadcaster as the displayed program in the same time zone as the displayed program in the program determination process, but the broadcaster different from the displayed program. The program column may be further referred to, or the program column of a time zone different from the displayed program may be further referred to.

When the determination unit 15 determines in the program determination process that the displayed program is a simul program, the determination unit 15 determines that the video system of the displayed program is the conversion HLG system (second video system). Further, when the determination unit 15 determines in the program determination process that the displayed program is not a simul program, the determination unit 15 determines that the video system of the displayed program is the pure 4K system (first video system).

The correction unit 16 executes a gain correction process for increasing the brightness level when the displayed program is displayed on the display unit 3. The gain correction process is a process for increasing the gain of the gamma curve (HLG gamma curve) used when the display control unit 12 generates a display control signal based on the video data. Here, "increasing the gain of the HLG gamma curve" means multiplying the HLG gamma curve by a coefficient (correction coefficient) of 1 or more. 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 displayed program is displayed on the display unit 3 is increased as compared with the case where the gain correction process is not executed.

The correction unit 16 executes the gain correction process based on the result of the determination process of the determination unit 15. When the determination unit 15 determines that the video system of the displayed program is the conversion HLG system, the correction unit 16 executes the gain correction process. When the determination unit 15 determines that the video system of the display program is the pure 4K system, in other words, the video system of the display program is not the conversion HLG system, the correction unit 16 does not execute the gain correction process.

As described 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, it corresponds to the reference white. The signal level to be used is 75%. Therefore, the video data of the converted HLG video does not include a region where the brightness level is greater than 75%. Strictly speaking, the 2K video (video before conversion) contains super white whose signal level is slightly higher than the reference white, and the video data of the converted HLG video contains a value whose brightness level is greater than 75%. In some cases. In this embodiment, it is assumed that the 2K image does not include super white.

In the present embodiment, when the video system of the display program is the conversion HLG system, the display control unit 12 generates a display control signal using the corrected HLG gamma curve. That is, the display control signal may include a region where the luminance level is greater than 75%. As a result, it is possible to prevent the converted HLG video, which is a display program, from being displayed darker than the pure 4K video.

The correction coefficient used for 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 value (= 1.25) of the ratio of the first level (100%) to the second level (75%). Therefore, while the upper limit of the brightness level of the converted HLG image is 75%, the upper limit of the brightness level of the display control signal after the gain correction processing is 100%. As a result, the upper limit of the brightness level of the converted HLG image can be made equal to the upper limit of the brightness level of the pure 4K image. In the present embodiment, the correction coefficient is 1.25, but the upper limit of the brightness level of the display control signal after the gain correction processing may be a value close to 100%, and is not limited to 1.25. For example, it may be 1.33.

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

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

Next, the determination unit 15 performs a determination process for determining the video system of the displayed program. First, the determination unit 15 executes the program determination process in the determination process. In the program determination process, the determination unit 15 compares the first electronic program guide corresponding to the new 4K8K satellite broadcasting with the second electronic program guide corresponding to BS / CS broadcasting (S2). Then, the determination unit 15 determines whether or not the displayed program is a simul program based on the comparison result of the electronic program guide (S3). Specifically, the determination unit 15 determines whether or not the description in the program column of the displayed program in the first electronic program guide is included in the second electronic program guide, so that the displayed program is a simul program. Judge whether or not. When the program name, program content, etc. of the displayed program are included in the second electronic program guide, the determination unit 15 determines that the displayed program is a simul program. For example, assume that the current time is in the 7 pm range, 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 displayed program is a simulcast program because the program name "XX variety" is described in the program column of the second broadcasting station in the second electronic program guide (see FIG. 3). do.

When the determination unit 15 determines that the display program is a simul program (S3: Yes), the determination unit 15 determines that the video system of the display program is the conversion HLG system. In this case, the correction unit 16 executes the gain correction process (S4). The correction unit 16 generates a corrected HLG gamma curve by multiplying each value of the HLG gamma curve by a correction coefficient of 1 or more in the gain correction process. 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 (S5). Then, the display control unit 12 outputs the generated display control signal to the display unit 3 to display the video of the program on the display unit 3 (S6).

Further, in step S3, for example, it is assumed that the current time is in the 9:00 pm range, the selected channel is the second channel, and the displayed program is "XX document" (see FIG. 2). In this case, the determination unit 15 determines that the displayed program is not a simul program because neither the program name nor the program content of the displayed program is described in the program column of the second broadcasting station in the second electronic program guide (see FIG. 3). do.

When the determination unit 15 determines that the display program is not a simul program (S3: No), the determination unit 15 determines that the video system of the display program is a pure 4K system. In this case, the correction unit 16 does not execute the gain correction process. Further, 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 or not the logo L2 "HDR" is included in the program column corresponding to the displayed program (S7). For example, assume that the current time is in the 7 pm range, the selected channel is the first channel, and the displayed program is "○○ document" (see FIG. 2). In this case, the display control unit 12 determines that the logo L2 "HDR" is included in the program column of the displayed program. That is, the display control unit 12 determines that the display program is HDR pure 4K.

When the display control unit 12 includes the logo L2 "HDR" in the program column of the display program (S7: Yes), the display control unit 12 gamma-corrects the video data of the display program using the HLG gamma curve to perform a display control signal. Is generated (S8). The HLG gamma curve used for the gamma correction in this case is not gain-corrected 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 (S6).

Further, in step S3, for example, it is assumed that the current time is in the 9:00 pm range, 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 program column of the displayed program does not include the logo L2 "HDR". That is, the display control unit 12 determines that the displayed program is SDR pure 4K.

When the display control unit 12 does not include the logo L2 "HDR" in the program column of the display program (S7: No), the display control unit 12 gamma-corrects the video data of the display program using the SDR gamma curve to perform a display control signal. Is generated (S9). 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 (S6).

In this way, the video processing device 1 and the television receiver 10 of the present embodiment perform a determination process for determining whether or not the video system of the displayed program is the conversion HLG system. Then, when the video system of the displayed program is the conversion HLG system, the gain correction process for increasing each value of the HLG gamma curve is executed. As a result, it is possible to prevent the converted HLG video, which is a display program, from being displayed darker than the pure 4K video. Further, when the video system of the displayed program is the pure 4K system, the gain correction process is not executed, so that the saturation of the luminance level (so-called white area) is suppressed.

Further, in the determination process, the video system of the displayed program is determined by determining whether or not the displayed program is a simul program by referring to the electronic program guide. Therefore, as compared with the case of analyzing the video, for example. Therefore, the processing load can be reduced and the judgment time can be shortened.

Further, in the present embodiment, the determination unit 15 determines the video system of the displayed program based on the electronic program guide. As the electronic program guide, a program guide for a predetermined period is generated in advance. Therefore, even before the program is displayed, the video system of the program can be determined in advance. Thereby, for example, it is not necessary to perform the determination process at the time of channel switching or program switching, and the gamma curve to be used can be determined in advance.

Further, in the present embodiment, since the determination unit 15 determines the video system by comparing the first electronic program guide and the second electronic program guide, the processing load of the determination process is further reduced and the determination is made. The time can be shortened.

The same function as the video processing apparatus 1 of the present embodiment may be embodied 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 system of the program in the television broadcast received by the receiving unit 2 is determined. In the gain correction process, the brightness level when the program is displayed on the display unit 3 is increased. The video system includes a first video system having a first resolution and a second video system in which a pre-conversion video having a second resolution lower than the first resolution is expanded and converted in resolution and dynamic range. In the determination process, when the program is a simulcast distributed by simulcast, it is determined that the program is the second video system. The gain correction process is executed when it is determined in the determination process that the program is the second video system.

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

In the present embodiment, the case where the video processing device 1 is applied to the television receiver 10 has been described as an example, but the video processing device 1 is applied to mobile terminals such as set-top boxes, personal computers, and smartphones, for example. It is possible.

1 Video processing device 10 TV receiver 15 Judgment unit 16 Correction unit 2 Receiver 3 Display unit L1 Logo

Claims (8)

A determination unit that determines the video format of the program in the television broadcast received by the receiving unit, and
A correction unit that performs gain correction processing that increases the brightness level when the program is displayed on the display unit is provided.
The video system is
The first video system, which is the first resolution,
The pre-conversion video having a second resolution lower than the first resolution is included in the second video system in which the resolution and the dynamic range are expanded and converted.
When the program is a simulcast distributed by simulcast, the determination unit determines that the program is the second video system.
When the determination unit determines that the program is the second video system, the correction unit executes the correction process.
Video processing equipment. The determination unit is based on a comparison result between a first electronic program guide of the first television broadcast, which is the television broadcast, and a second electronic program guide of the second television broadcast, which is different from the first television broadcast. Determining whether the program is the simul program,
The video processing apparatus according to claim 1. When the description of the program column corresponding to the program in the first electronic program guide is included in the second electronic program guide, the determination unit determines that the program is the simulcast program.
The video processing apparatus according to claim 2. The first electronic program guide is included in the first television broadcast,
The second electronic program guide is included in the second television broadcast.
The video processing apparatus according to claim 2 or 3. In the pre-conversion video, the signal level corresponding to the reference white is the first level.
In the second video system, the signal level corresponding to the reference white is the second level lower than the first level.
In the correction process, the correction unit multiplies the value of the gamma curve by using the value of the ratio of the ratio of the first level to the second level as the correction coefficient.
The video processing apparatus according to any one of claims 1 to 4. The dynamic range of the pre-conversion video is SDR.
The second video system is an HLG system, and is
The first level is 100%
The second level is 75%.
The video processing apparatus according to claim 5. The video processing device according to any one of claims 1 to 6.
With the receiver
The display unit is provided.
TV receiver. It is a program for causing a computer system to execute a judgment process and a gain correction process.
In the determination process, the receiving unit determines the video system of the program in the television broadcast received by the receiver.
In the gain correction process, the brightness level when the program is displayed on the display unit is increased.
The video system is
The first video system, which is the first resolution,
The pre-conversion video having a second resolution lower than the first resolution is included in the second video system in which the resolution and the dynamic range are expanded and converted.
In the determination process, when the program is a simulcast distributed by simulcast, it is determined that the program is the second video system.
The gain correction process is executed when the determination process determines that the program is the second video system.
program.

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