JP5051876B2 - Video output apparatus and control method thereof - Google Patents

Description

  The present invention relates to a video output device and a control method thereof, and more particularly, to a video output device having a video adjustment function and a control method thereof.

  Conventionally, there has been a demand for always viewing images with optimal image quality. In response to such a request, a television receiver (hereinafter simply referred to as a television) that detects a program genre transmitted as program information by broadcast waves and automatically switches video adjustment values according to the program genre has already been put into practical use. Has been.

  For such TVs, for example, programs with the genre “Variety” have high brightness, saturation, and contrast so that they appear vivid. The image is adjusted to set the contrast higher.

  On the other hand, an image display device that attempts to reduce eye fatigue caused by viewing images for a long time has also been proposed. In Patent Document 1, in a head-mounted display device that displays an image in the entire field of view, as shown in FIG. 15, the luminance of the image is decreased as the display time elapses, and eye strain is suppressed. In addition, a technique for making it easy to view an image even when eye strain occurs is disclosed.

JP 2003-076353 A

  However, if the brightness and contrast of the image are reduced in accordance with the passage of the display time, there is a problem that the same scene appears differently.

Further, when using a video display device that automatically adjusts video according to a program genre, it is considered that the degree of eye fatigue varies depending on the program genre. For example, as described above, if the video of the genre “variety” is vividly adjusted, and the program of the genre “movie” is automatically adjusted to the dark, the “variety” program is viewed even when viewed at the same time. Would be more tired of eyes than a “movie” program.
That is, the conventional video display device that performs uniform automatic video adjustment for each program genre has room for improvement from the viewpoint of suppressing eye fatigue.

  The present invention has been made in order to solve at least one of the problems of the prior art, and is an adjustment that does not depend on the passage of time for the video in the same program while taking into account the eyestrain of the viewer. An object of the present invention is to provide a video output apparatus that performs the above and a control method thereof.

The above-described object is a video output device that receives video data related to a broadcast program and outputs the video of the broadcast program, using acquisition means for acquiring broadcast time information of the broadcast program, and broadcast time information of the broadcast program Calculating means for calculating the remaining time of the broadcast program at the time when the output of the video of the broadcast program is started, generating means for generating a video adjustment parameter for adjusting the video data, and applying the video adjustment parameter to the video data for output The image adjustment parameter is a parameter related to at least one of peak luminance, contrast, and saturation, and the generation unit suppresses the upper limit value of the image adjustment parameter as the remaining time is longer. This is achieved by a video output device characterized by generating adjustment parameters.

The above-described object is a method for controlling a video output apparatus that receives video data related to a broadcast program and outputs the video of the broadcast program, and includes an acquisition step of acquiring broadcast time information of the broadcast program, Using the broadcast time information, a calculation step of calculating the remaining time of the broadcast program at the time when the output of the broadcast program video is started, a generation step of generating a video adjustment parameter for adjusting the video data, and the video adjustment parameter as the video data The image adjustment parameter is a parameter related to at least one of peak luminance, contrast, and saturation, and the generation step increases the upper limit value of the image adjustment parameter as the remaining time is longer. It is also achieved by a video output device control method characterized by generating video adjustment parameters to suppress.

  With such a configuration, according to the present invention, it is possible to make adjustments that do not depend on the passage of time for videos related to the same program, while taking into account the eyestrain of the viewer.

(First embodiment)
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
It should be noted that the specific functions, shapes, relative arrangements, and the like of the constituent elements in the following description are for purposes of illustration and explanation, and are not intended to limit the scope of the invention, unless otherwise specified.

  FIG. 1 is a block diagram illustrating a functional configuration example of a television receiver as an example of a video output apparatus according to an embodiment of the present invention. Here, it is assumed that the television receiver of this embodiment can receive digital television broadcasts.

  In FIG. 1, a digital television signal received by an antenna 100 is input to a tuner 101. The tuner 101 performs processing such as demodulation and error correction on a signal of a specified frequency included in the input digital television signal to generate transport stream data (hereinafter referred to as TS). Further, the tuner 101 outputs the generated TS to the descrambler 102.

  The descrambler 102 outputs the TS received from the tuner 101 to the demultiplexer 103 as it is when it is not scrambled. On the other hand, when the scrambled TS is received from the tuner 101, the scramble is canceled (descrambled) using the key information stored in advance, and is output to the demultiplexer 103.

  In the TS output from the descrambler 102, video, audio data, program information data, and the like are time-division multiplexed. The demultiplexer 103 extracts video data, audio data, and program information data related to the broadcast program of the channel designated by the system control unit 106 from the TS input from the descrambler 102. The video data is output to the video decoder 113, the audio data is output to the audio decoder 112, and the program information data is output to the program information decoder 114. The system control unit 106 receives a channel selection instruction from the operation unit 109 provided in the housing or from the remote controller 111 through the light receiving unit 110 and notifies the tuner 101 of a channel to be selected.

  In the present embodiment, the TS is configured in units of packets, and a PID (Packet Identifier) that is information for identifying the type of video, audio, and data is included in the head portion of each packet.

  The video decoder 113 performs a corresponding decoding process on the encoded video data input from the demultiplexer 103 and outputs the decoded video data to the video processing unit 117. In the present embodiment, the video data is encoded by, for example, the MPEG-2 system, and thus the video decoder 113 performs a decoding process according to the MPEG-2 system.

The audio decoder 112 performs a corresponding decoding process on the encoded audio data input from the demultiplexer 103 and outputs it to a DAC (Digital Analog Converter) 115.
The DAC 115 performs D / A (Digital / Analog) conversion processing on the audio data, and outputs the audio data to the audio output unit 116 that is a speaker, for example.

  The program information decoder 114 acquires predetermined information from the program information data, which is information related to the broadcast program, input from the demultiplexer 103, and outputs it to the video processing unit 117, the display screen configuration unit 118, and the UI screen configuration unit 120. To do.

  Program information data mainly includes SDT (Service Description Table), EIT (Event Information) in accordance with the standard “Program Arrangement Information Used for Digital Broadcasting” (ARIB STD-B10) established by the Japan Radio Industry Association. Table) and TDT (Time Description Table).

  The SDT includes information such as a service name corresponding to the broadcast channel and a service provider. The EIT includes information on an event name corresponding to a program, an event start time, a duration, and the like. The TDT contains information about the current time and date.

  The video processing unit 117 performs video adjustment processing on the video data based on the video data input from the video decoder 113 and the program information input from the program information decoder 114. Then, the adjusted video data is output to the display screen configuration unit 118 as a video of the broadcast program. Details of the video adjustment processing will be described later.

  A UI (User Interface) screen configuration unit 120 configures screen data such as an EPG (Electronic Program Guide) and a video adjustment notification screen described later on the basis of program information data input from the program information decoder 114, and a display screen configuration. To the unit 118.

  The display screen configuration unit 118 receives video data and screen data from the video processing unit 117 and the UI screen configuration unit 120. The display screen configuration unit 118 generates display data by switching or synthesizing video data and screen data according to instructions from the system control unit 106 according to operations from the operation unit 109 or the remote control 111, The video is output to the video output unit 119.

The video output unit 119 converts display data for displaying a video of a broadcast program and a UI screen according to the display resolution, the number of display colors, and the refresh rate of the display device 121 that is a flat display panel, for example, and outputs the converted data.
The system control unit 106 comprehensively controls the above-described components of the television receiver.

FIG. 2 is a block diagram illustrating a functional configuration example of the video processing unit 117.
The video processing unit 117 includes a channel selection management unit 201, a statistic calculation unit 202, a correction mode management unit 203, an adjustment parameter generation unit 204, an adjustment parameter correction unit 205, a format conversion unit 206, and a conversion table 207.

  The channel selection management unit 201 calculates the remaining time of the program at the time when the output of the video of the program is started (viewing start time) using information regarding the broadcast program acquired from the program information decoder. The statistic calculation unit 202 calculates a statistic regarding the pixel value of the video data of the program being viewed, and calculates a weight coefficient. The correction mode management unit 203 acquires the genre information of the program being viewed from the program information decoder, and determines the correction mode.

  The adjustment parameter generation unit 204 applies the weighting factor calculated by the statistic calculation unit 202 to the basic video adjustment parameters set in advance according to the correction mode, and generates the video adjustment parameters.

  The adjustment parameter correction unit 205 is based on the video adjustment parameter generated by the adjustment parameter generation unit 204, the correction mode determined by the correction mode management unit 203, and the remaining program time calculated by the channel selection management unit 201. Correct the video adjustment parameters.

The statistic calculation unit 202, the correction mode management unit 203, the adjustment parameter generation unit 204, and the adjustment parameter correction unit 205 function as a video adjustment parameter generation unit.
The format conversion unit 206 converts the input video data from the YUV format to the RGB format.

  A conversion table 207 as an output unit generates a conversion table from the video adjustment parameters input from the adjustment parameter correction unit 205, adjusts the video data from the format conversion unit 206 using the conversion table, and displays the display screen configuration unit as display data. To 118.

Next, the video adjustment operation in the digital television receiver of this embodiment will be described with reference to the flowchart shown in FIG. 3 together with FIGS.
In step S <b> 301, the channel selection management unit 201 of the video processing unit 117 stands by until the television receiver is turned on or a channel selection of a different channel is notified from the system control unit 106. When the notification is received, the channel selection management unit 201 obtains the current time and the start time and duration of the program currently being broadcast on the selected channel from the program information decoder 114, and calculates the remaining time of the program. To the adjustment parameter correction unit 205 (S302).

  Here, the remaining time of a program that has started (viewed) video output from the beginning is equal to the duration of the program. However, for programs that have started to be viewed halfway, the remaining time can be obtained from the difference between the program end time calculated from the program start time and the duration and the current time.

For example, program A (channel 1, 19:00 to 21:00), program B (channel 2, 19:00 to 21:00), program C (channel 1, 21 to 23:00), program D (channel 2, 21:00 to 23:00) )).
In channel 1, when the program C is continuously viewed from the program A, the viewing start time of the program C is 21:00 which is the start time of the program C, and the remaining time of the program is 2 hours, which is equal to the duration of the program. Further, when switching to channel 2 during viewing of program A, the viewing start time of program B becomes the time when switching to channel 2. For example, when switching from channel 1 to channel 2 at 19:30, the viewing start time of program B is 19:30, and the remaining time of the program is 1.5 hours.

  However, if channel 1 is selected and viewing of program A starts, channel 2 is viewed for a short time (for example, several seconds) and then returned to channel 1, the viewing start time of program A is the first program Let A be the time when viewing started.

  The statistic calculator 202 calculates a histogram of pixel luminance values for each frame of the video data input from the video decoder 113. Then, a weighting factor is calculated from the calculation result and output to the adjustment parameter generating unit 204. (S303)

  In the present embodiment, for example, if each pixel can take a luminance value of 0 to 255, the statistic calculator 202 has a low gradation pixel number with a luminance value of 0 to 60 and a high gradation pixel with a luminance value of 190 to 255. Count each number. Then, a weight coefficient for each of the low gradation pixel and the high gradation pixel is calculated from the difference between each count value and a predetermined threshold value.

  The correction mode management unit 203 obtains the genre information of the program of the selected channel from the program information decoder 114 and notifies the adjustment parameter generation unit 204 and the adjustment parameter correction unit 205 of the correction mode corresponding to the genre information. The correspondence between the genre information and the correction mode is managed by the correction mode management unit 203 as a table as shown in FIG. 4, for example.

  The adjustment parameter generation unit 204 generates a video adjustment parameter based on the weighting factor acquired from the statistic calculation unit 202 and the correction mode acquired from the correction mode management unit 203. (S304)

  For example, as illustrated in FIG. 5, the adjustment parameter generation unit 204 holds a parameter set prepared in advance in which the correction mode and the video adjustment parameter are associated with each other. Then, a suitable video adjustment parameter is generated for each frame by applying the weighting coefficient acquired from the statistic calculation unit 202 to each of the video adjustment parameters associated with the correction mode acquired from the correction mode management unit 203. The generated video adjustment parameter is output to the adjustment parameter correction unit 205.

  On the other hand, the adjustment parameter correction unit 205 acquires, from the system control unit 106, video adjustment setting information indicating whether video adjustment is performed automatically, semi-automatically, or manually (S305). This setting information is set in advance by the user from a setting screen (not shown) constructed by the UI screen configuration unit 120.

  If the video adjustment is set to automatic, the adjustment parameter correction unit 205 notifies the system control unit 106 that automatic video adjustment is to be performed. The system control unit 106 manages whether or not the notification screen for notifying the user of the execution of automatic video adjustment has already been displayed for each program, and checks whether the notification screen has been displayed for the currently viewed program ( S306). Only when it is not displayed, the UI screen configuration unit 120 is instructed to generate notification screen data.

  In response to this instruction, the UI screen configuration unit 120 generates and outputs notification screen data that notifies the user that video adjustment is to be performed. The display screen configuration unit 118 generates display data obtained by synthesizing the notification screen data with the video data, and causes the display device 121 to display the display data through the video output unit 119 (S307). FIG. 6 shows an example of the display screen 601 on which the notification screen 602 is synthesized and displayed. The notification screen is deleted after the preset time has elapsed (compositing display is terminated).

  On the other hand, when the video adjustment is set to semi-automatic in the setting information acquired in S305, the adjustment parameter correction unit 205 requests the system control unit 106 to make an inquiry to the user. In response to this request, the system control unit 106 checks from the management data whether or not it has already inquired about the program being viewed, similarly to the notification screen (S308). Only when no inquiry is made, the UI screen composition unit 120 is instructed to generate screen data for inquiring the user whether or not to adjust the video.

  In response to this instruction, the UI screen configuration unit 120 generates and outputs inquiry screen data for inquiring the user whether or not to perform automatic video adjustment. The display screen configuration unit 118 generates display data obtained by synthesizing the inquiry screen data with the video data, and displays the display data on the display device 121 through the video output unit 119 (S309). FIG. 7 shows an example of the display screen 701 on which the inquiry screen 702 is synthesized and displayed.

  The system control unit 106 detects whether “Yes” or “No” is selected by the operation unit 109 or the remote controller 111 and notifies the adjustment parameter correction unit 205 of the result. When selection is detected, the display screen configuration unit 118 is notified to delete the inquiry screen.

  In step S310, the adjustment parameter correction unit 205 determines whether to perform correction in response to the notification from the system control unit 106. When “Yes” is selected from the inquiry screen on the display screen 701, a video adjustment parameter correction process described later is performed. On the other hand, if “No” is selected, or if there is no input even after a predetermined value has elapsed, the adjustment parameter correction unit 205 generates the adjustment parameter generation unit 204 without performing the video adjustment parameter correction processing. Use the adjusted video adjustment parameters.

  When the image adjustment is manual, the image adjustment is performed using a user-specified parameter set set in advance from a setting screen (not shown) instead of the image adjustment parameter generated by the adjustment parameter generation unit 204 (S311).

  In the above configuration, the display screen of the video adjustment notification screen or the display of the inquiry screen is switched according to the user setting. It is also possible.

  The adjustment parameter correction unit 205 corrects the video adjustment parameter based on the video adjustment parameter, the correction mode, and the remaining program time generated by the adjustment parameter generation unit 204. (S312)

  In the present embodiment, the adjustment parameter correction unit 205 corrects three of the five video adjustment parameters, peak luminance, contrast, and saturation, according to the remaining time. The specific correction amount corresponding to the relationship between the correction mode and the remaining time is held by the adjustment parameter correction unit 205 as a table as shown in FIG. 8, for example.

  As shown in FIG. 8, in this embodiment, the remaining program time is divided into three categories of “0 to 60 minutes”, “60 to 120 minutes”, and “120 minutes or more” for each correction mode. .

  When the remaining time of the program is “0 to 60 minutes”, the video adjustment parameters are not corrected regardless of the correction mode. When the remaining time of the program is “60 minutes to 120 minutes”, there is a concern about eye fatigue due to continuing viewing for a long time. For example, when the correction mode is “Violet”, for example, the upper limit value of the peak luminance The video adjustment parameter is corrected so as to suppress the value to 95% before correction.

  The longer the remaining time, the greater the degree to which the upper limit value of the image adjustment parameter is suppressed, which is common in any correction mode. However, the specific upper limit value varies depending on the correction mode. For example, when the correction mode is “Azayaka” and “Movie”, the original parameter set (the initial value before correction by the weighting coefficient and the value stored in the adjustment parameter generation unit 204) is used. Because it is different, the burden on the eyes is also different. Therefore, the correction amount (suppression amount) of the adjustment parameter correction unit 205 is large in the correction mode using the parameter set for adjusting the image quality with a high eye load. In other words, the amount of suppression is different for each correction mode because the correction mode is “Azayaka”, which places a greater burden on the eyes than “Movies”. For example, the “Azayaka” mode has higher brightness, contrast, saturation, and the like than the “Movie” mode, so the amount to be suppressed (the difference in values, not the correction ratio) is increased.

  In order to facilitate explanation and understanding, the remaining time of the program is classified into three categories for each correction mode. However, there is no need for the three categories, and the detailed time width is changed to be adjusted in detail. It is also possible. Further, the remaining time range may be different for each correction mode, or the number of categories may be changed.

  The format conversion unit 206 converts the input YUV format video data into the RGB format in accordance with the characteristics of the display device, and outputs it.

The conversion table 207 generates a conversion table from the video adjustment parameters input from the adjustment parameter correction unit 205, corrects the video data output from the format conversion unit 206 by applying the conversion table, and outputs the conversion table to the display screen configuration unit 118. (S313).
The above process is repeated.

  FIG. 9 is a diagram for explaining the difference between the video adjustment processing according to the present embodiment and the conventional video adjustment processing. As shown in FIG. 9, the conventional video adjustment process described in Patent Document 1 decreases the luminance with the passage of time, so that even the video having the same luminance is different in appearance according to the elapsed time. become. However, in the video adjustment process according to the present embodiment, the correction amount is uniquely determined by the remaining time of the program calculated at the viewing start time. Even if elapses, it is displayed with the same brightness. For this reason, similar scenes are displayed in the same manner regardless of the elapsed time, and their appearance is not greatly different.

FIG. 10 is a diagram illustrating an example of a change in the correction amount when the viewing program changes.
For example, for a program to which the correction mode “Azayaka” is applied and the remaining time is 80 minutes, the video adjustment parameter is suppressed up to 95% of the peak luminance (1101). When watching a program whose combination of the correction mode and the remaining time is the same after the end of the program or by switching channels, the correction with the upper limit of 95% of the peak luminance is applied as in the first program.

  In addition, the correction mode of the program to be watched continuously is common (that is, “Azakaya”), and when the remaining time is 130 minutes, the combination category of the correction mode and the remaining time is different, so that 90% of the peak luminance is obtained. The video adjustment parameter is corrected with 110 as the upper limit (1102). That is, the remaining time is calculated for the program that has started to be viewed, and the video adjustment parameter correction processing is performed for each program according to FIG. 8 based on the calculated remaining time.

  As described above, according to the present embodiment, the upper limit value of the video adjustment parameter of the video is corrected so as to be suppressed by a certain amount determined at the start of viewing the program according to the remaining time of the program, and then the program viewing ends. Until then, the amount of suppression is not changed.

  Therefore, the same scene is displayed in the same manner immediately after the start of viewing the program or after the passage of time, and the visual impression does not change significantly. Furthermore, since the video adjustment parameter is corrected so as to reduce the burden on the eyes from the beginning as the remaining time of the program is longer, the burden on the eyes can be reduced even when viewing for a long time.

  In addition, when video adjustments having different characteristics for each program genre are performed, the amount of suppression is determined by a combination of the genre and the remaining time, so that more appropriate video adjustment is possible. Specifically, the suppression amount is set larger for a genre that adjusts to an image quality that places a greater burden on the eyes.

(Second Embodiment)
In this embodiment, in addition to the video adjustment processing described in the first embodiment, the suppression is performed according to the viewing duration (the elapsed time from the start of video output, which is cleared to zero when the power is turned off). By changing the amount (correction amount), the burden on the eyes is further suppressed.

  The video adjustment apparatus according to the present embodiment may be common to the digital television receiver described in the first embodiment except for a partial configuration of the video processing unit. Therefore, the content already described will be omitted, and the configuration and processing operation different from the first embodiment will be described mainly.

  FIG. 11 is a block diagram illustrating a functional configuration example of the video processing unit 1200 in the television receiver according to the present embodiment. In FIG. 11, the same components as those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

  As is clear from the comparison between FIG. 2 and FIG. 11, the video processing unit 1200 in the present embodiment is newly provided with a viewing time measuring unit 1201. Also, the adjustment parameter correction unit 1202 is different from the first embodiment in that the adjustment parameter correction unit 1202 calculates the video adjustment parameter in consideration of the measurement result of the viewing time measurement unit 1201.

  The video adjustment operation in the television receiver of this embodiment will be described below with reference to the flowchart shown in FIG. Also in FIG. 12, the same reference numerals as those in FIG. 3 are assigned to steps for performing the same processing as in the first embodiment. Therefore, in the following, the steps for performing processing unique to the present embodiment will be mainly described.

  In the present embodiment, the viewing duration is measured.

  Specifically, when the power of the television receiver is turned on, in S1301, the count value of the viewing time measuring unit 1201 is initialized, and then counting is started. The counting can be performed using a timer built in the system control unit 106. In order to reflect the actual viewing time as much as possible in the count value, start counting when the channel is not switched for a predetermined time after the power is turned on (or when the same channel is continuously viewed for a predetermined time). Is preferred.

In S301 ′, the channel selection management unit 201 confirms whether or not the channel switching is notified from the system control unit 106, and if there is a notification, calculates the remaining time of the program that has started to be watched (S302). . Further, when the channel is switched, the viewing time measuring unit 1201 stops counting the viewing duration (S1302). And it waits for the predetermined time mentioned above (S1303), and if there is no switching of channel in the meantime, the count of viewing continuation time is restarted (S1304). Thereafter, the viewing time measuring unit 1201 continues the same counting operation until the power is turned off. Therefore, the count value of the viewing time measuring unit 1201 corresponds to a cumulative value (viewing duration time) of watching a certain program after turning on the power.
Since the subsequent processing is the same as that of the first embodiment except for the video adjustment parameter correction processing in S312 ′, only the processing in S312 ′ will be described.

  The adjustment parameter correction unit 1202 in the present embodiment considers the viewing duration measured by the viewing time measurement unit 1201 in addition to the video adjustment parameters, correction mode, and remaining program time generated by the adjustment parameter generation unit 204, Correct the video adjustment parameters.

  Here, in the same manner as in the first embodiment, the first suppression amount of the video adjustment parameter is obtained from the correction mode and the remaining time of the program, and further, the suppression coefficient obtained from the viewing duration is added to the first suppression amount. Multiply to find the second suppression amount. Then, the video adjustment parameter is corrected by applying the second suppression amount. Note that the suppression coefficient is a coefficient representing a ratio when the video adjustment parameter suppressed by the first suppression amount is re-suppressed.

  FIG. 13 is a diagram illustrating a relationship example between the viewing duration and the suppression coefficient. In the present embodiment, the relationship between the suppression coefficient and the viewing duration is different for each correction mode, but the tendency that the suppression coefficient decreases as the viewing duration increases is common. In other words, this means that the amount of suppression increases as the viewing duration increases. The reason why the suppression coefficient is different for each correction mode is that a parameter set having different characteristics is used for each correction mode, and thus the degree of eye fatigue associated with viewing duration is considered to be different.

  For example, when the viewing of an 80-minute program to which the correction mode “Azayaka” is applied is started, as described in the first embodiment, the upper limit value of the peak luminance when the upper limit value of the peak luminance is not corrected is 95. The video adjustment parameter is suppressed to be%. In this case, since the viewing duration at the start of viewing the program is 0, the suppression system number is 1 (that is, the first suppression amount = the second suppression amount), and the correction of the video adjustment parameter considering the viewing duration is as follows. Practically not done.

  After that, it is assumed that viewing is continued and viewing of another program is started due to factors such as viewing until the end of the program or channel switching. In this case, if the correction mode of the second program that has started to be viewed is still “Azayaka” and the remaining time of the program is 80 minutes, the correction amount of the video adjustment parameter does not change in the first embodiment. However, in this embodiment, since the viewing duration is measured, the video adjustment parameter is further corrected according to the length. In other words, in the correction mode “Azayaka”, the upper limit value of the peak luminance is suppressed by 5% by the category having the remaining time of 80 minutes, and the suppression according to the viewing duration is performed. Specifically, the upper limit value of the peak luminance is suppressed to a value (%) obtained by 95 (%) × suppression system number (<1). Note that the same correction is performed on video adjustment parameters other than the peak luminance (here, contrast and saturation).

FIG. 14 is a diagram showing the correction method of the video adjustment parameter in the present embodiment described above, normalized with respect to luminance.
First, it is assumed that viewing of an 80-minute program to which the correction mode “Azayaka” is applied is started. In this case, correction that suppresses the upper limit value of the peak luminance to 95% is performed from the relationship between the correction mode and the remaining time of the program (1501), but no further correction considering the viewing duration is performed. Assume that after this program ends, or by channel switching, viewing of the 80-minute program to which the correction mode “Azayaka” is applied is started.

  In this case, when the re-correction based on the viewing duration is not performed as in the first embodiment, only the correction for suppressing the upper limit value of the luminance to 95% is performed as in the previous program (1502). On the other hand, in the present embodiment, correction for suppressing the video adjustment parameter is performed in consideration of the viewing continuation time at the start of viewing the second program (1503).

  As described above, according to the present embodiment, in addition to the first correction that suppresses the video adjustment parameter in advance based on the remaining time of the program, the video adjustment parameter is suppressed according to the viewing duration. A second correction is performed. Thereby, in addition to the effect in the first embodiment, it is possible to effectively reduce the burden on the eyes.

(Other embodiments)
In the above description, a television receiver is shown as an example of a video output device according to an embodiment of the present invention. However, the video output device according to the present invention does not necessarily have a configuration for displaying video, and may be configured to output the output of the video output unit 119 to an external display device. Similarly, as long as the remaining program time can be calculated, a component (tuner) for receiving broadcast waves is not necessarily provided.

  In the above description, the genre information is associated with the correction mode, and the upper limit value of the video adjustment parameter is corrected according to the relationship between the correction mode and the remaining program time. However, the concept of correction mode is not essential. For example, the adjustment parameter generation unit 204 may store genre information and basic video adjustment parameters in association with each other. The adjustment parameter correction units 205 and 1202 may also categorize categories based on the relationship between the genre information and the remaining program time. However, when there are many types of genre information, the introduction of the concept of the correction mode can save the memory capacity for storing the tables shown in FIGS.

It is a block diagram which shows the function structural example of the television receiver as an example of the video output device which concerns on embodiment of this invention. It is a block diagram which shows the function structural example of the video processing part in the 1st Embodiment of this invention. It is a flowchart explaining the video adjustment operation | movement in the digital television receiver of the 1st Embodiment of this invention. It is a figure which shows the example of a response | compatibility with the genre information and correction | amendment mode in the 1st Embodiment of this invention. It is a figure which shows the example of a response | compatibility with the correction mode in the 1st Embodiment of this invention, and a video adjustment parameter. It is a figure which shows the example of the display screen by which the notification screen displayed by the 1st Embodiment of this invention was combined and displayed. It is a figure which shows the example of the display screen on which the inquiry screen displayed by the 1st Embodiment of this invention was combined and displayed. It is a figure which shows the example of the corrected amount according to the relationship between the correction mode and remaining time in the 1st Embodiment of this invention. It is a figure explaining the difference of the video adjustment process by the 1st Embodiment of this invention, and the conventional video adjustment process. In the 1st Embodiment of this invention, it is the figure shown about the example of the change of the corrected amount when a viewing-and-listening program changes. It is a block diagram which shows the function structural example of the video processing part in the 2nd Embodiment of this invention. It is a flowchart explaining the video adjustment operation | movement in the digital television receiver of the 2nd Embodiment of this invention. It is a figure which shows the example of a relationship between viewing-and-listening continuation time and a suppression coefficient in the 2nd Embodiment of this invention. In the 2nd Embodiment of this invention, it is the figure shown about the example of the change of the correction amount when a viewing-and-listening program changes. It is a figure explaining the video adjustment process in the conventional video display apparatus.

Claims (12)

A video output device that receives video data related to a broadcast program and outputs video of the broadcast program,
Obtaining means for obtaining broadcast time information of the broadcast program;
Calculating means for calculating the remaining time of the broadcast program at the time when output of the video of the broadcast program is started, using broadcast time information of the broadcast program;
Generating means for generating a video adjustment parameter for adjusting the video data;
Output means for applying and outputting the video adjustment parameters to the video data;
The video adjustment parameter is a parameter related to at least one of peak luminance, contrast, and saturation,
The video output device, wherein the generation unit generates the video adjustment parameter so as to suppress the upper limit value of the video adjustment parameter as the remaining time is longer. The acquisition means further acquires genre information of the broadcast program,
The generation unit corrects a video adjustment parameter prepared in advance according to the genre information according to the remaining time, so that the upper limit value of the video adjustment parameter is suppressed as the remaining time is longer. The video output device according to claim 1, wherein an adjustment parameter is generated.   3. The video output apparatus according to claim 1, wherein the generation unit does not change the upper limit value of the generated video adjustment parameter until the output of the video of the broadcast program is finished. . Furthermore, it has a measuring means for measuring the elapsed time from the time when the output of the video of the broadcast program is started,
The video output apparatus according to claim 1, wherein the generation unit generates the video adjustment parameter so as to further suppress the upper limit value of the video adjustment parameter as the elapsed time is longer.   5. The video output apparatus according to claim 1, wherein the video adjustment parameters are peak luminance, contrast, and saturation. Correction mode management means for setting one of a plurality of correction modes each associated with a different video adjustment parameter;
  The generation unit corrects the video adjustment parameter associated with the correction mode set by the correction mode management unit according to the remaining time, so that the upper limit value of the video adjustment parameter is increased as the remaining time is longer. The video output device according to claim 1, wherein the video adjustment parameter is generated so as to be suppressed. A control method of a video output device that receives video data related to a broadcast program and outputs video of the broadcast program,
An acquisition step of acquiring broadcast time information of the broadcast program;
Using the broadcast time information of the broadcast program, calculating the remaining time of the broadcast program at the time of starting the output of the video of the broadcast program;
Generating a video adjustment parameter for adjusting the video data;
An output step of applying and outputting the video adjustment parameters to the video data;
The video adjustment parameter is a parameter related to at least one of peak luminance, contrast, and saturation,
The method of controlling a video output device, wherein the generating step generates the video adjustment parameter so that an upper limit value of the video adjustment parameter is suppressed as the remaining time is longer. The acquisition step further acquires genre information of the broadcast program,
The generating step corrects the video adjustment parameter prepared in advance according to the genre information according to the remaining time, so that the upper limit value of the video adjustment parameter is suppressed as the remaining time is longer. 8. The method of controlling a video output device according to claim 7, wherein the adjustment parameter is generated. Said generating step, an upper limit value of the image adjusting parameters the product, the broadcast program of the video output device during the claims 7 or claim 8, wherein it does not change until the end of the output image Control method. Furthermore, it has a measurement step of measuring the elapsed time from the time when the output of the video of the broadcast program is started,
Said generating step, the control of the elapsed time is long enough the video output apparatus according to claim 7 or claim 8, wherein the generating an image adjustment parameter so as to further suppress the upper limit of the image adjusting parameters Method. The image adjustment parameters, a control method of a video output device according to any one of the peak luminance, claim 7, characterized in that the contrast and saturation to claim 10. A correction mode management step of setting one of a plurality of correction modes each associated with a different video adjustment parameter;
  The generation step corrects the video adjustment parameter associated with the correction mode set in the correction mode management step according to the remaining time, so that the upper limit value of the video adjustment parameter is increased as the remaining time is longer. 8. The method of controlling a video output apparatus according to claim 7, wherein the video adjustment parameter is generated so as to be suppressed.

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