JP6869724B2 - Video processing equipment and video processing method - Google Patents

Description

Embodiments of the present invention relate to a video processing apparatus and a video processing method.

As a next-generation display, organic EL displays are being actively researched as an alternative technology to liquid crystal displays. The organic EL display is a display that uses an organic light emitting diode (OLED), which is a kind of light emitting diode, and applies an organic electroluminescence (organic EL) phenomenon. Since this organic EL display does not use a backlight and the pixel itself, which is an OLED, emits light, high brightness, high contrast, and high-speed response can be realized. On the other hand, compared to liquid crystal displays, there is also the disadvantage that screen burn-in is more likely to occur.

In recent years, digital broadcasting has begun in earnest, and broadcasting methods for distributing data together with video are increasing. In such data distribution, a specific area of the display is secured, and the distributed data content is displayed in the specific area. Areas other than the area where data contents are displayed in such a specific area are often displayed still with the same brightness and the same color, and screen burn-in is likely to occur. Various studies have been conducted as measures against such burn-in. However, although it is possible to make a static determination for each pixel or region, a pattern in which a specific part of the screen is stationary as described above is detected in real time, and the display brightness is determined according to the stationary time. It is difficult to control.

JP-A-2007-304318 Japanese Unexamined Patent Publication No. 2011-28149 Japanese Unexamined Patent Publication No. 2014-126698 Japanese Unexamined Patent Publication No. 2011-39420

Therefore, the present embodiment provides a video processing device capable of performing stationary detection of an area occupying a predetermined area and obtaining the stationary time.

The image processing device includes a block stationary time measuring unit, a predetermined area stationary time calculating unit, a brightness adjustment value calculating unit, and a brightness adjusting unit. The block rest time measuring unit measures the block rest time, which is the time when each block of the received video information is stationary in the block obtained by dividing the video display area into a plurality of blocks. The predetermined area rest time calculation unit determines the degree of rest in the image to be displayed in the image display area based on the distribution information indicating the relationship between the block rest time and the number of blocks that are stationary for the block rest time. The predetermined area rest time, which is an index to represent, is calculated. The brightness adjustment value calculation unit calculates a brightness adjustment value for adjusting the brightness of the output image based on the predetermined area rest time. The brightness adjusting unit adjusts the brightness for outputting the video information based on the brightness adjusting value.

The figure which shows typically the display which includes the image processing part which concerns on one Embodiment. The figure which shows typically the display area of the display which concerns on one Embodiment. The block diagram showing explaining the function of the image processing part which concerns on one Embodiment. The flowchart which shows the processing of the image processing part which concerns on one Embodiment. The figure which shows an example of the histogram of the stationary block which concerns on one Embodiment. The figure which shows an example of the brightness adjustment value which concerns on one Embodiment. The figure which shows an example of the display display and the histogram which concerns on one Embodiment. The figure which shows another example of the display display which concerns on one Embodiment. The figure which shows typically the installation example of the image processing part which concerns on one Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is not limited to the present invention.

The image processing unit according to the present embodiment divides the entire area for displaying an image into a plurality of areas, determines the stationary state from the change in brightness for each area, and determines the stationary time of the area and the stationary area. By controlling the brightness of the image based on the number, it is intended to prevent burn-in in the display area.

FIG. 1 is a diagram showing an example of a television receiver 1 including a video processing unit according to the present embodiment. The television receiver 1 includes a display 2 for displaying an image and an image processing unit 3 (see FIG. 3) housed in the housing of the display 2. For example, when a data distribution broadcast is received and the user is viewing the content by data distribution, as shown in FIG. 1, the image display area, which is an area for displaying an image on the display 2, displays the received image. It includes a video content display area 2A and a data content display area 2B for displaying received data. The display 2 is, for example, an organic EL display, and the pixels include an OLED. In the following description, the video processing unit 3 will be described, but the video processing unit 3 corresponds to a video processing device within the scope of the claims.

The video content display area 2A is an area for displaying the contents of a broadcast program, and is generally a rectangular area in which a moving image is displayed. In the video content display area 2A, since the video content in a normal broadcast is displayed, it takes only a few seconds even if it is stationary, and even if the video is obtained by a fixed camera, the brightness blur or position Because of the deviation, it is not so often that the same pixel is continuously displayed for a long time with the same brightness and the same color.

On the other hand, the data content display area 2B displays, for example, information related to the content of the program, news, or information for bidirectional communication with the broadcast program. For example, as shown in FIG. 1, a region extending in the horizontal direction along the lower frame of the display 2 and a region extending in the vertical direction along the right frame of the display 2 are combined to form a high news item. Lights and weather forecast data for each area are displayed. Such a display is, for example, displaying artificially created graphics, and the display other than characters and weather symbols does not change. As a result, in the pixels of many regions in the data content display region 2B, the brightness and color of the emitted light often do not change, and there is a high possibility that burn-in will occur.

The video content display area 2A and the data content display area 2B are examples, and are not limited to the shapes described above. For example, the video content display area 2A may be located at the lower right of the display 2, and the data content display area 2B may extend horizontally along the upper frame of the display 2 and vertically along the left frame. .. Further, a plurality of video content display areas 2A may exist in the video display area of the display 2, and the other areas may be the data content display area 2B.

FIG. 2 is a diagram schematically showing a display area of a display 2 included in the television receiver 1 according to the present embodiment. As shown in FIG. 2, the display area of the display 2 is, for example, a 4K2K display having a resolution of 3840 pixels in width and 2160 pixels in height. In the present embodiment, this display area is divided into a plurality of blocks 200. The block 200 has, for example, a total of 2048 blocks of 64 horizontal blocks and 32 vertical blocks, and the display area is divided into 2048 areas by these blocks 200. The number of pixels and the number of blocks are merely examples, and the number of pixels and the number of blocks are not limited to these numbers.

Each block 200 is used to determine whether the block constitutes a still image or a moving image by monitoring the pixel value as the brightness in the block. Then, as will be described later, the brightness of the display area of the display 2 is controlled based on the still time of the block 200 constituting the still image. As the pixel value, a brightness value can be used as an example, but the pixel value is not limited to this, and a value that can be an index indicating a hue or other brightness may be used. In the conceptual diagram of FIG. 2, the block forms a square area, but the present invention is not limited to this, and the block may be rectangular.

FIG. 3 is a block diagram for explaining the function of the image processing unit 3 included in the television receiver 1 of FIG. As shown in FIG. 3, the video processing unit 3 is a device that controls and outputs the brightness of the received video information, and is a video information receiving unit 10, a block brightness detecting unit 12, and a block stationary detecting unit 14. , The block brightness storage unit 16, the block stationary time measuring unit 18, the block stationary time storage unit 20, the predetermined area stationary time calculation unit 22, the brightness adjustment value calculation unit 24, and the brightness adjustment unit 26. It includes a video output unit 28.

The video information receiving unit 10 is a receiving unit that receives the video content and the data distribution content displayed on the display 2. The video information receiving unit 10 receives the content of the moving image to be displayed in the video content display area 2A, and also receives the distributed data content. The data received by the video information receiving unit 10 is output to the block luminance detecting unit 12.

When the received video data is displayed on the screen, the block luminance detection unit 12 blocks from the video to be displayed in each block 200 of the display 2 from the brightness value of each pixel provided in the block 200. A brightness value of 200 is detected. The detected luminance value is output to the block static detection unit 14.

The block stillness detection unit 14 detects whether each block is a still image or a moving image. Whether the block is a still image or a moving image is detected based on, for example, a comparison between the brightness value of the pixels existing in each block and the brightness value of the previous frame stored in the block brightness storage unit 16. Will be done. This detection result is output to the block rest time measuring unit 18.

The block brightness storage unit 16 stores the brightness value of the block after the block stillness detection unit 14 detects whether the block is a still image or a moving image. Based on the stored luminance value, the next static detection in the block is performed.

The block stationary time measuring unit 18 measures the time (block stationary time) in which each block is detected as a stationary image by using the detection result of the block stationary detecting unit 14. When a still image is detected, the time stored in the block still time storage unit 20 is counted up, and in the case of a moving image, it is reset. The block rest time storage unit 20 stores the block rest time of each of the measured blocks.

The predetermined area still time calculation unit 22 uses the block still time information of each block stored in the block still time storage unit 20, and is based on the still time of the still image area recognized as a still image in the display 2. Calculate the rest time of the entire display area. For example, a rest time histogram, which is distribution information showing the relationship between the block rest time and the number of blocks that are still for the block rest time, is calculated, and the rest time is calculated according to the distribution. That is, the predetermined area rest time calculation unit 22 calculates the predetermined area rest time based on the measurement result of the block rest time measurement unit 18. The still time of the entire display area (predetermined area still time) is based on the still time of the still image area recognized as a still image in the display 2, and whether or not it is a graphics image such as data broadcasting is indicated by graphics. The image determination unit (not shown) may make a determination and calculate according to the determination result.

The brightness adjustment value calculation unit 24 calculates the brightness value of the entire screen based on the calculated rest time. Then, the brightness adjusting unit 26 adjusts the brightness value of each pixel received by the video information receiving unit 10 based on the calculated brightness value, and the video output unit 28 adjusts the brightness by the brightness adjusting unit 26. The image is output to the display 2.

FIG. 4 is a flowchart showing an operation flow of the video processing unit 3 according to the present embodiment.

First, the predetermined area rest time calculation unit 22 initializes the block rest time histogram showing the distribution of the block rest time per unit time (step S100). This block rest time histogram is stored in the block rest time storage unit 20.

Next, the video information receiving unit 10 receives the video information to be displayed on the display 2 (step S102). This video information is, for example, video information transmitted from a broadcasting station via radio waves for broadcasting, and includes data distribution contents in addition to the video information. Further, it may be video information that does not include data distribution content. Further, it may be video information received via an Internet line such as a wireless LAN or a wired LAN, or may be video information received via a cable line.

The video information receiving unit 10 may be, for example, a circuit or the like in which data received by the antenna is transmitted via a tuner or the like and receives the data, or may be built in the tuner or the like. .. The following processing is performed on the video actually displayed on the display 2, that is, the video including the graphics which is the data distribution content, or the data of the video content which does not include the graphics.

Next, the process shifts to the process of calculating the histogram which is the distribution information of the block rest time and the number of blocks having the block rest time using the received video information (steps S104 to S116). This process is performed on, for example, each block 200 of the display 2 in FIG. That is, the processing steps S106 to S114 between the steps S104 and S116 are processed for each block and are repeatedly processed for the number of blocks. Hereinafter, the processing performed for each block will be described.

First, the block brightness detection unit 12 detects, for example, the brightness of the block as the brightness of the block (step S106). The detection of the brightness of the block is detected, for example, by calculating the brightness values of all the pixels in the block and calculating the average value. Alternatively, the added value may be used instead of the average value. When the average value is used, the storage capacity when storing the brightness value of the block can be reduced, and when the value is added, the amount of calculation for dividing by the number of pixels in the block. It is possible to reduce.

Next, the block static detection unit 14 determines whether or not the difference between the brightness before the unit time and the current brightness is larger than a predetermined threshold value (step S108). Specifically, it is determined whether or not | (brightness before a unit time)-(current brightness) |> threshold value. In this case, the unit time is a predetermined time for determining whether the image is a still image or a moving image, and may be, for example, one frame, 500 milliseconds, or one minute. This setting can be changed depending on the device as long as the burning does not occur, or may be set by the user. As the brightness, for example, the brightness value detected by the block brightness detection unit 12 is used.

The brightness before the unit time is stored in the block brightness storage unit 16. When the power is turned on, or when the channel for receiving video is changed, a predetermined value, for example, 0 may be assigned to all blocks as an initial state. The threshold value, which is a predetermined value, is set to a predetermined value. For example, when the luminance value is obtained with 10 bits, it may be set to 16, 32, 64, etc., it may be arbitrarily set by the user, and it is not necessary to make it a power of 2. This setting can be set in consideration of the characteristics of the image, such as a large amount of noise or a small amount of noise, as long as the burn-in does not occur. Further, it may be possible to set at the time of manufacture depending on the performance of the display 2.

When the difference between the brightness before the unit time and the current brightness is larger than the threshold value (step S108: Yes), it is determined that the image output in the block is a moving image, and the image is stored in the block stationary time storage unit 20. The timer count of the block of interest is initialized and updated (step S110). The initialization is, for example, a process of setting the timer count to 0.

On the other hand, when the difference between the brightness before the unit time and the current brightness is equal to or less than the threshold value (step S108: No), it is determined that the image output in the block is a still image, and the block still time storage unit. The timer count of the block of interest stored in 20 is increased and updated (step S112). Increasing the timer count means, for example, a process of increasing the value of the timer count by incrementing the timer count.

By performing the processes from step S108 to step S112 in this way, the unit time in which the block is determined as a still image is calculated. For example, when the count value of the block recorded in the block rest time storage unit 20 is n, the block is stationary for n frames, stationary for n × 100 milliseconds, or stationary. , It is possible to determine the stationary state of the block, such as being stationary for n minutes. When n = 0, the image in the block is determined to be a moving image, and when n is not 0, n is an index indicating the stationary state of the block. When the operation on the counter is completed, the block brightness storage unit 16 stores the current brightness of the block detected by the block brightness detection unit 12. The block determined as a still image does not have to be updated.

Next, the count value is reflected in the block rest time histogram (step S114). The block rest time histogram is updated based on the timer count whose state has been updated in step S110 or step S112. That is, in the block, when the rest state continues for n, the count value corresponding to n in the histogram is incremented.

FIG. 5 is a simple example showing the number of blocks and the time. In FIG. 5, the number of blocks is 30. The horizontal axis shows the time when the blocks are stationary in unit time, and the vertical axis shows the number of blocks whose timer count value is each time. For example, the number of blocks in the state of being stationary for 0 unit time is 7 blocks, and the number of blocks in the state of being stationary for 1 unit time is 5 blocks.

In step S114, a histogram is created by adding +1 to the value of the graph in which the timer count of the block corresponds to the unit time on the horizontal axis. For example, if the timer count is 3 in the block, the value of the graph corresponding to 3 on the horizontal axis is set to +1. That is, when the number of stationary blocks (vertical axis) corresponding to 3 unit times (horizontal axis) is 4, the value is updated to 5. Although it is shown in the figure for explanation, the present invention is not limited to this, and a block rest time histogram, which is distribution information, may be represented as simple numerical information.

Next, it is determined whether or not the processing of steps S106 to S114 has been performed in each block (step S116). If there is a block that has not been reflected in the histogram yet, the processing after step S106 is performed on the next block, and if all the blocks are reflected in the histogram, the iterative calculation of steps S106 to S114 is performed. Exit.

When this iterative process is completed, a histogram, which is distribution information showing the relationship between the block rest time and the number of blocks, is created as the distribution of the block rest time. For example, in FIG. 5, when the stationary state of all 30 blocks is reflected, a histogram for 30 blocks is created as shown in the figure. As another example, when the display area is divided into 2048 blocks 200 as shown in FIG. 2, a histogram for 2048 blocks is created.

Next, the predetermined area rest time calculation unit 22 calculates the predetermined area rest time from the number of stationary blocks (step S118). In the present embodiment, the predetermined area rest time is an index showing the degree of rest in the image displayed on the display 2. The calculation of the predetermined area rest time is, for example, calculating the time such that 50% of the blocks of the display are still images.

More specifically, it will be described with reference to FIG. In FIG. 5, the total number of blocks is 30, so 50% of the blocks means 15 blocks. First, the histogram is accumulated from the larger time division, and the time when the time becomes 15 blocks or more is detected. Since the histogram value at 5 unit time is 4, the histogram value at 4 unit time is 6, and the histogram value at 3 unit time is 5, 4 + 6 + 5 = 15. In this case, 50% for a period of at least 3 unit time. This means that the block of was stationary. In this case, the predetermined area means an area of 50% of the display area.

That is, the predetermined area rest time calculation unit 22 cumulatively adds the number of blocks as the predetermined area rest time in order from the number of blocks having the maximum block rest time to the value having the smaller block rest time. The block rest time when the cumulative addition value reaches a predetermined ratio in the total number of blocks is defined as a predetermined area rest time. For example, in the above example, the predetermined area rest time is calculated to be 3 unit times. Note that 50% is an example, and the ratio of the predetermined area to the display area is not limited to this, and may be another predetermined ratio, for example, 40%, or as a separate value for each broadcasting station. May be good. Further, the predetermined area may be a predetermined value instead of the ratio with respect to the display area.

As another example, the number of blocks having the minimum block rest time, or the number of blocks in order from the number of blocks having a block rest time of 0 to the value having a larger block rest time. Cumulative addition may be performed. In either case, it is possible to obtain equivalent results.

Next, the brightness adjustment value calculation unit 24 calculates the brightness adjustment value of the image to be output based on the predetermined area rest time calculated by the predetermined area rest time calculation unit 22 (step S120). FIG. 6 is an example showing a gain which is an example of a predetermined area rest time and a brightness adjustment value. The horizontal axis represents the predetermined area rest time in unit time, and the vertical axis represents the gain with respect to the brightness. For example, as shown in FIG. 6, the received video is output as it is up to 1 unit time, which is the first predetermined rest time, the gain is linearly reduced from 1 unit time to 3 unit time, and the second predetermined time is determined. When the rest time of 3 units is exceeded, the minimum gain value of 0.5 becomes a constant value. In the gain example in FIG. 6, the brightness of the standard display when adjusting the brightness is set to 1, but the brightness is not limited to this, and for example, the gain based on the brightness before gamma correction is used. It is also possible to.

That is, the gain remains 1 until the first predetermined quiesce time, and when the predetermined area quiesce time is equal to or longer than the first predetermined quiesce time, the gain starts to decrease from 1 and the second predetermined quiesce time starts to decrease. The gain continues to decrease until the second predetermined rest time is reached, and the gain is fixed at a predetermined value. As a result, when the predetermined area rest time is equal to or longer than the first predetermined rest time but is less than or equal to the second predetermined rest time, the image displayed on the display 2 becomes darker as the predetermined area rest time gradually becomes longer, and becomes darker. When the area rest time becomes longer than the second predetermined rest time, the darkness in the second predetermined rest time becomes constant.

In the example of FIG. 6, since the predetermined area rest time is 3 unit times, the gain is 0.5. The gain function is not limited to that shown in FIG. 6, and any gain function may be used as long as the gain decreases from the value before detection to the minimum value, that is, from the first predetermined rest time to the second predetermined rest time. The change in gain up to does not have to be linear. For example, a function using a trigonometric function, a sigmoid function, an exponential function, a step function, or the like may be used to gradually decrease from the maximum value to the minimum value. The minimum value does not have to be 0.5, and may be another value such as 0.8 or 0.7. Further, although simplified for the sake of explanation, the unit time on the horizontal axis may be set in more detail. In particular, the timing for starting the gain suppression (first predetermined rest time) does not have to be one unit time later, and it is conceivable to further increase the margin so that the user does not feel uncomfortable when looking at the screen. ..

The maximum value may be set as the timer count. For example, in the case of the gain shown in FIG. 6, it is considered sufficient to set the maximum value of the timer count to about 5 unit times, so the maximum value of the timer count is set to 5. You may. Furthermore, predetermined values such as the maximum value of the timer count, the predetermined value for determining the predetermined area rest time, the threshold value of the difference in the brightness value for each block, and the like can be changed via the Internet line or the like. It may be designed to be changed based on the distribution status of the data content. In addition, some combinations may be presented so that the user can select them.

Next, the brightness adjustment unit 26 adjusts the brightness value of the output image by multiplying the received video information based on the calculated brightness adjustment value by the brightness adjustment value (step S122). The brightness value may be adjusted by multiplying the entire output image by the brightness adjustment value, or may be adjusted according to the brightness of the block, the predetermined area rest time, and the screen position. Alternatively, as another example, as the brightness adjustment value, it is possible to select an index of a value to be subtracted from the brightness of the display area as the brightness adjustment value instead of the gain. In this case, a value based on the brightness adjustment value may be subtracted from the displayed brightness.

Finally, the video output unit 28 outputs the output image whose brightness is adjusted by the brightness adjustment unit 26 to the display (step S124). As described above, the video processing unit 3 receives the video information, adjusts the brightness value of the output video based on the received video information, and outputs the video information. In the above, processing is performed even when the data distribution content is not displayed, but in the case of setting not to display the data distribution content, this processing is not performed and the received video information is output. It can also be output as a video. That is, the above-described processing may be performed only in the case of the setting for displaying the data distribution content.

Although the above-mentioned processing describes only the processing performed every unit time, the processing for adjusting the brightness value of the output video is performed at a frequency required for outputting the video, for example, every frame. That is, until the next unit time arrives, the brightness adjustment value is set to the calculated constant value, and the brightness value of the image to be output little by little every frame is adjusted according to the brightness adjustment value. .. In this way, both the process of calculating the brightness adjustment value and the process of adjusting the brightness value are performed for each unit time, and at other timings, the output video is output without performing the process of calculating the brightness adjustment value. The process of adjusting the brightness value is performed. However, when the process of calculating the brightness adjustment value is performed every frame, that is, when one unit time is one frame, the processes of all the steps described above are performed every frame.

As another example, the processes from step S100 to step S120 and the processes of steps S122 and S124 may be completely separated. For example, the brightness of the image output by the brightness adjustment unit 26 for each frame is adjusted based on the calculated brightness adjustment value, and the image is output (steps S122 to S124). In parallel with this, the process until the brightness adjustment value calculation unit 24 calculates the brightness adjustment value is performed every unit time, and the brightness adjustment value may be updated (steps S100 to S120). .. For example, these two processing systems may be parallelized and started as separate processes. That is, two processes are started, and in the first process, the brightness adjustment value is calculated for each unit time in the second process while adjusting the brightness every frame, and the calculated brightness adjustment value is used. It may be reflected in the first process.

Since FIGS. 5 and 6 are examples, their values are simplified for the sake of explanation, but more specific examples will be described below in chronological order.

7 (a) to 7 (c) are diagrams showing the image displayed on the display 2 after the reception of the image is started, and the histogram value in each case. In each of these figures, it is assumed that the video content display area 2A is always determined to be a moving image. Further, it is assumed that the reception of the video is started at the time of FIG. 7A. The maximum value of the timer counter is assumed to be 30 unit time.

In the state of FIG. 7A when the reception of the video is started, the news highlight is displayed on the lower side and the weather information of each place is displayed as the data distribution content on the right side in the data content display area 2B of the display 2. .. In the histogram, the time counters are reset in all the blocks, so all the blocks are concentrated at 0 unit time. In this case, since the predetermined area rest time of the video information is 0 unit time, the brightness is not suppressed and is displayed on the display 2.

FIG. 7B is a diagram showing the display 2 and the histogram 30 unit hours after the start of receiving the video. As shown in the histogram, since it is determined that the block displaying the data distribution content, which occupies more than half of all the blocks, is a still image, the distribution is concentrated at the position of 30 unit times. Then, according to a function of the brightness adjustment value (not shown), the brightness of the screen displayed on the display 2 is adjusted by the brightness adjustment unit 26, and as shown in the figure, as compared with the case of FIG. 7A, It is displayed dark as a whole. The darkness is extremely dark for the sake of clarity in the figure, but the degree of darkness shall follow the function of the brightness adjustment value.

FIG. 7 (c) is a diagram showing 15 unit hours after the weather information of each region is switched to the information of another region from the state of FIG. 7 (b). In this case, in most of the data content display area 2B, it is determined that the image is a still image even after 30 unit times, so that there are a little less than 800 blocks as the maximum value of the timer count, which is 30 unit times. Then, at the location of 15 unit hours, there are more than 300 blocks that are determined to be moving images 15 unit hours ago by updating the weather information and subsequently determined to be still images. In this case, for example, the brightness of the display 2 is determined by the value of the gain function with respect to the 15 unit time because it is 15 unit time that exceeds 50% of the 2048 blocks, accumulating from the larger unit time. It is determined. Then, an output image slightly brighter than the state shown in FIG. 7B is displayed. Further, as another example, it is assumed that the update of the weather information has a small degree of change and the stationary state is continued, and the state of FIG. 7B may be maintained.

8 (a) and 8 (b) are views showing another example displayed on the display 2. For example, as shown in these figures, consider a case where a white rectangle slowly moves from the left side to the right side of the screen in a black screen. In such a case, if a histogram of the number of blocks of the still image with respect to the unit time is used, there are many blocks having a short predetermined area still time and no blocks having a long predetermined area still time. Therefore, when the gain function as shown in FIG. 6 is used. Since the gain is not suppressed or becomes smaller, the brightness of the entire screen does not change so much.

As a comparative example, without using a histogram, it is determined whether the pixel constitutes a still image or a moving image based on the pixel before a unit time or the difference from the brightness of the block, and the pixel constituting the still image is determined. Consider darkening when it is 50% or more. In this case, since the histogram is not used, if it is determined that the pixels constitute a still image with 50% or more of the pixels, the screen will be darkened immediately, but since it is actually a moving image, it is a moving image. It will be a false judgment. As described above, according to the present embodiment, it is possible to suppress such an erroneous determination.

FIG. 9 is an installation example of the video processing unit 3 according to the present embodiment. As shown in FIG. 9, the television receiver 1 has an external signal input unit 100 that receives a signal from an antenna, a cable, or the like, and a SoC (System-on-a-Chip) 102 that performs image processing and other processing. And a memory 104. The SoC 102 includes a hardware processing unit 110 and a software processing unit 112. The video processing unit 3 may be configured on the hardware processing unit 110 or the software processing unit 112 on the SoC 102. Further, various storage units may be provided in the memory 104, or may be provided in the hardware processing unit 110 on the SoC 102. Further, as shown in the figure, the hardware processing unit 110 may be provided on the SoC 102, or may be separately provided as an IC (Integral Circuit), an FPGA (Field Programmable Gate Array), or an ASIC (Application Specific Integrated Circuit). The software processing unit 112 may be separately provided as an IC or a microcomputer. The mounting method is not limited to the above-mentioned example, and various other mounting methods may be used.

As described above, according to the present embodiment, by using the histogram as the distribution information of the stationary block and the block stationary time, a predetermined area which is an index indicating the degree of stationary in the image displayed on the display 2 It is possible to accurately determine the rest time and more accurately control the brightness to prevent seizure. In this way, by controlling the brightness of the television receiver 1 according to the present embodiment by the image processing unit 3, the screen may change to a dark screen even though the area of the moving image is wide due to an erroneous determination. Alternatively, it is possible to prevent the screen from being displayed brightly even though the area of the still image is wide, and it is possible to efficiently control the brightness to prevent burning. ..

In the above description, the processes from step S106 to step S112 are performed in order for each block, but for speeding up, some or all blocks may be calculated in parallel. Good.

Further, in the above-described embodiment, the gain adjustment process has been described, but when the user performs a remote control operation or the like, the displayed image is reset by initializing the timer count value. May be good. By doing so, it is possible to display the screen brightly when the user takes some action, and it is also possible to make the screen easier to see and assist the user's operation. Further, other brightness corrections such as gamma correction can be appropriately applied together with the application of the above gain.

In the present embodiment, the medium for displaying the image is the television receiver 1, but it may be a display for a computer, a display for both a television and a computer, and the size of the display 2 is not limited. The display 2 is, for example, a 4K2K display, but the resolution is not limited and may be another resolution. The 4K2K display has been described as having a resolution of 2160p, but the resolution is not limited to this, and may be a resolution such as 4096 × 2160 pixels by DCI4K (Digital Cinema Initiatives 4K). Further, the display may be a touch panel type. Further, although the case of the organic EL display has been described, it may be a plasma display or a liquid crystal display. In the case of a computer display, the video display area in the above description may be, for example, an image display area.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof. Further, as a matter of course, it is also possible to partially and appropriately combine these embodiments within the scope of the gist of the present invention.

1: TV receiver, 2: Display, 2A: Video content display area, 2B: Data content display area, 3: Video processing unit, 10: Video information receiving unit, 12: Block brightness detection unit, 14: Block static detection unit , 16: Block brightness storage unit, 18: Block stationary time measurement unit, 20: Block stationary time storage unit, 22: Predetermined area stationary time calculation unit, 24: Brightness adjustment value calculation unit, 26: Brightness adjustment unit, 28 : Video output unit, 200: Block.

Claims (6)

In a block in which the video display area is divided into a plurality of blocks, a block rest time measuring unit that measures the block rest time, which is the time when each block of received video information is stationary,
A predetermined area rest time, which is an index showing the degree of rest in the video displayed in the video display area, based on the distribution information showing the relationship between the block rest time and the number of blocks that are still for the block rest time. With a predetermined area rest time calculation unit that calculates
A brightness adjustment value calculation unit that calculates a brightness adjustment value for adjusting the brightness of an output image based on the predetermined area rest time,
A brightness adjustment unit that adjusts the brightness for outputting the video information based on the brightness adjustment value, and
Equipped with a,
Based on the distribution information, the predetermined area rest time calculation unit performs the block rest time in the order from the number of blocks having the maximum value to the block rest time to the smaller value, or the block rest time. The number of the blocks is cumulatively added in the order from the number of the blocks having the minimum value to the value with the largest block rest time, and the cumulative number of the blocks has reached a predetermined number. The rest time is calculated as the predetermined area rest time.
Video processing equipment. A block brightness detection unit that detects the brightness of each block,
A block rest detection unit that detects whether or not each block is stationary based on the detected brightness.
A block rest time storage unit that stores the block rest time in each block,
With more
The block quiescent time measuring unit updates the block quiescent time stored in the block quiescent time storage unit based on the detection result of the block quiescent detection unit.
The video processing apparatus according to claim 1, wherein the predetermined area rest time calculation unit generates the distribution information based on the block rest time stored in the block rest time storage unit. According to claim 1 or 2 , the predetermined area rest time calculation unit reaches the predetermined number when the cumulatively added number of blocks reaches a predetermined ratio in the total number of the blocks. The video processing device described. When the predetermined area rest time is equal to or longer than the first predetermined rest time, the brightness adjustment value calculation unit displays the brightness so that the image to be displayed becomes darker than before the first predetermined rest time. The video processing apparatus according to any one of claims 1 to 3 , wherein the adjustment value is controlled. The brightness adjustment value calculation unit is
When the predetermined area rest time is equal to or longer than the first predetermined rest time, but is longer than the first predetermined rest time and is less than or equal to the second predetermined rest time, as the predetermined area rest time becomes longer, the predetermined area rest time becomes longer. The brightness adjustment value is controlled so that the displayed image gradually becomes darker.
When the predetermined area rest time is longer than the second predetermined rest time, the brightness adjustment value is constant at the brightness adjustment value in the second predetermined rest time regardless of the predetermined area rest time. The image processing apparatus according to claim 4 , wherein the image processing apparatus is controlled so as to be. A step in which the block rest time measuring unit measures the block rest time, which is the time when each block is stationary in a block in which the video display area of the received video information is divided into a plurality of blocks.
The predetermined area rest time calculation unit determines the degree of rest in the image displayed in the image display area based on the distribution information indicating the relationship between the block rest time and the number of blocks that are stationary for the block rest time. The step of calculating the predetermined area rest time, which is an index to represent, and
A step in which the brightness adjustment value calculation unit calculates a brightness adjustment value for adjusting the brightness of the output image based on the predetermined area rest time.
A step in which the brightness adjusting unit adjusts the brightness for outputting the video information based on the brightness adjusting value, and
Equipped with a,
In the step of calculating the predetermined area rest time, the predetermined area rest time calculation unit changes the block rest time from the number of blocks having the maximum value to the block rest time to a smaller value based on the distribution information. The number of blocks is cumulatively added and cumulatively added in the order of the number of blocks, or in the order from the number of blocks having the minimum value of the block quiescent time to the value of the block quiescent time being large. The block rest time when the number reaches a predetermined number is calculated as the predetermined area rest time.
Video processing method.

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