CN108847201B - Brightness processing method and device, computer equipment and readable storage medium - Google Patents

Abstract

Embodiments of the present invention disclose a brightness processing method, an apparatus, a computer device, and a readable storage medium. The brightness processing method includes: acquiring an initial brightness gain (Gain) value of the static image according to the initial APL value of the static image; Value attenuation rate; perform brightness attenuation processing on the static image through the Gain value attenuation rate, and obtain the stable brightness value of the static image after the attenuation is completed. The embodiment of the present invention solves the brightness attenuation method in the prior art. Since a single form of brightness attenuation method is adopted for static images of different initial states, the stable brightness obtained after attenuation may not be suitable for the current application scene, and it is easy to generate Afterimages and color cast problems.

Description

A brightness processing method, apparatus, computer equipment and readable storage medium

technical field

The present application relates to, but is not limited to, the field of display technology, and in particular, to a brightness processing method, apparatus, computer equipment, and readable storage medium.

Background technique

With the development of display technology, users have higher and higher requirements for the intelligent functions of the display. For example, lighting a static image in a high-brightness state for a long time will easily cause TFT aging and afterimage, thus affecting the display effect of the display. Therefore, , it is required that the display can perform brightness attenuation processing on the static picture by itself.

At present, the general method of brightness attenuation processing can be as follows: Attenuate the brightness of each sub-pixel of the current static image, and multiply the brightness of each sub-pixel by a proportional coefficient less than 1. This attenuation method is relatively simple to implement. However, there are the following defects: First, the static images with different initial brightness use the same numerical attenuation ratio. For static images with low initial brightness, the stable brightness obtained after the attenuation is stabilized is too low, which affects the user's viewing effect; second, For static images with different initial brightness, the same decay time is used. For static images with higher initial brightness, the screen is prone to afterimages during the decay process. Third, for static images with different colors, when the average brightness of the image (AveragePixel Level, referred to as : APL) values are different, different brightness attenuation ratios are used, which will cause different stable brightness after attenuation of different APL values, resulting in color shift. Obviously, the brightness attenuation method in the prior art adopts a single form of brightness attenuation method for static images in different initial states, resulting in the stable brightness obtained after attenuation may not be suitable for the current application scene, and prone to afterimages and color shifts. .

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the embodiments of the present invention provide a brightness processing method, apparatus, computer equipment and readable storage medium to solve the brightness attenuation method in the prior art, since a single form is used for static pictures of different initial states Therefore, the stable brightness obtained after attenuation may not be suitable for the current application scene, and it is prone to after-image and color cast problems.

An embodiment of the present invention provides a brightness processing method, including:

Obtain the initial brightness gain Gain value of the static picture according to the average brightness APL value of the initial picture of the static picture;

According to the initial Gain value of the static picture, the stable Gain value after the static picture completes the attenuation, and the preset attenuation time, obtain the gain value attenuation rate;

Perform brightness attenuation processing on the static image according to the Gain value attenuation rate, and obtain a stable brightness value of the static image after the attenuation is completed.

Optionally, in the brightness processing method as described above, the decay rate of the Gain value of the static picture is:

V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ;

Wherein, the Gain ₀ is the initial Gain value, the t _max is the preset attenuation time, the Gain _min is the minimum gain of the static image, the q is the preset attenuation ratio, and the Gain _min *(1-q) is the stable Gain value after the decay is completed.

Optionally, in the above-mentioned brightness processing method, it also includes:

The attenuation ratio is adjusted according to the stable brightness value of the static image after the attenuation is completed.

Optionally, in the brightness processing method as described above, after acquiring the decay rate of the Gain value of the static image, the method further includes:

Obtain the current Gain value of the static image during the decay process according to the initial Gain value, the decay rate of the Gain value and the decayed time;

Obtain the current brightness value of the static image in the decay process according to the current Gain value;

The obtaining of the stable brightness value of the static image after the attenuation is completed includes:

When the decayed time reaches the preset decay time, calculate the stable brightness value as:

L'=L*(Gain ₀ -V_gain*t _max ); wherein, the L represents the brightness of the red, green and blue sub-pixels after adding the white sub-pixels (RGB-RGBW);

When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as a stable luminance value.

Optionally, in the above-mentioned brightness processing method, it also includes:

Determine the static judgment time of the display picture according to the average brightness APL value of the initial picture of the display picture;

During the static judgment time, static judgment is performed according to the picture brightness of each frame of the display picture.

Optionally, in the brightness processing method as described above, the determining the static judgment time of the display image according to the initial APL value of the display image includes:

When the initial APL value is 0 to 0.05, the static judgment time is:

T=-1000*APL ₀ +60;

When the initial APL value is 0.05 to 0.5, the static judgment time is:

T=111*APL ₀ +4.45;

When the initial APL value is 0.5 to 1, the static judgment time is:

T=100*APL ₀ +110;

Wherein, the T is the static judgment time, and the APL ₀ is the initial APL value.

An embodiment of the present invention also provides a brightness processing device, including:

an acquisition module, configured to acquire the initial brightness gain Gain value of the static picture according to the average brightness APL value of the initial picture of the static picture;

a rate calculation module, configured to obtain the gain value decay rate according to the initial Gain value of the static image, the stable Gain value after the static image has been attenuated, and a preset decay time;

A brightness attenuation module, configured to perform brightness attenuation processing on the static image by using the Gain value attenuation rate;

A brightness acquisition module, configured to acquire the stable brightness value of the static image after the attenuation is completed.

Optionally, in the brightness processing device as described above, the rate calculation module calculates the decay rate of the Gain value as:

V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ;

Wherein, the Gain ₀ is the initial Gain value, the t _max is the preset attenuation time, the Gain _min is the minimum gain of the static image, the q is the preset attenuation ratio, and the Gain _min *(1-q) is the stable Gain value after the decay is completed.

Optionally, in the above-mentioned brightness processing device, it also includes:

An adjustment module, configured to adjust the attenuation ratio according to the stable brightness value after the static image has been attenuated.

Optionally, in the above-mentioned brightness processing device, it also includes:

an intermediate value calculation module, configured to obtain the current Gain value of the static image during the decay process according to the initial Gain value, the decay rate of the Gain value and the decayed time;

The intermediate value calculation module is further configured to obtain the current brightness value of the static image in the decay process according to the current Gain value;

The brightness obtaining module obtains the stable brightness value of the static image after the attenuation is completed, including:

When the decayed time reaches the preset decay time, calculate the stable brightness value as:

L'=L*(Gain ₀ -V_gain*t _max ); wherein, the L represents the brightness of the red, green and blue sub-pixels after adding the white sub-pixels (RGB-RGBW);

When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as a stable luminance value.

Optionally, in the above-mentioned brightness processing device, it also includes:

a time determination module, configured to determine the static judgment time of the display image according to the average brightness APL value of the initial image of the display image;

The static judgment module is configured to perform static judgment according to the picture brightness of each frame of the displayed picture within the static judgment time.

An embodiment of the present invention also provides a computer device, including: a memory and a processor;

the memory for storing executable instructions;

The processor is configured to implement the brightness processing method according to any one of the above when executing the executable instructions stored in the memory.

An embodiment of the present invention further provides a computer-readable storage medium, where executable instructions are stored in the computer-readable storage medium, and when the executable instructions are executed by a processor, the brightness processing method according to any one of the foregoing is implemented.

In the brightness processing method, device, computer equipment, and readable storage medium provided by the embodiments of the present invention, the initial Gain value of the static picture is obtained according to the initial APL value of the static picture, and the attenuated Gain value after the static picture is completed according to the initial Gain value and the static picture is obtained. value and preset decay time, calculate the decay rate of the Gain value, and then use the gain value decay rate to perform luminance decay processing on the static image, and obtain a suitable stable luminance value after the decay is completed; the luminance processing method provided by the embodiment of the present invention, for For static pictures with different colors and initial effects, the brightness attenuation is performed at the matching Gain value attenuation rate during the processing. After the attenuation is completed, a stable brightness value with high adaptability is obtained. In addition, for static pictures of different colors, based on the initial APL The gain value attenuation rate calculated from the calculated value is used for brightness attenuation to avoid the phenomenon of color shift after attenuation; the brightness attenuation method in the prior art is solved. The stable brightness obtained after attenuation has poor adaptability, and is prone to after-image and color cast problems.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the specification. They are used to explain the technical solutions of the present invention together with the embodiments of the present application, and do not limit the technical solutions of the present invention.

FIG. 1 is a flowchart of a brightness processing method provided by an embodiment of the present invention;

2 is a flowchart of another brightness processing method provided by an embodiment of the present invention;

3 is a flowchart of another brightness processing method provided by an embodiment of the present invention;

4 is a graph showing the relationship between an APL value and a static judgment time in a brightness processing method provided by an embodiment of the present invention;

FIG. 5 is a flowchart of still another brightness processing method provided by an embodiment of the present invention;

FIG. 6 is an effect diagram after brightness attenuation is performed by using the brightness processing method provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a luminance processing apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another luminance processing apparatus provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of another luminance processing apparatus provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a computer device according to an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, the embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other if there is no conflict.

The present invention provides the following specific embodiments that can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

FIG. 1 is a flowchart of a brightness processing method according to an embodiment of the present invention. The brightness processing method provided by the embodiment of the present invention may include the following steps:

S110: Acquire an initial luminance gain (Gain) value of the static image according to the initial APL value of the static image.

The brightness processing method provided by the embodiment of the present invention is a method for performing brightness attenuation processing on a static image displayed by a display. That is to say, the application scenario of the embodiment of the present invention is: when the picture currently displayed by the display is a static picture, the brightness attenuation processing is performed on the static picture. In addition, afterimages are generated, which affects the display effect of the display. Therefore, during the display process of the display, the brightness attenuation processing can be performed on the static images displayed for a long time to reduce the display brightness of the display, thus protecting the display performance and delay of the display. The role of display life.

In the embodiment of the present invention, it can be determined whether the currently displayed picture is a static picture by judging the sub-pixels in the pictures before and after the display process. After judging that the currently displayed picture is a static picture, the static picture is known. The initial APL value of , and the initial Gain value of the static picture can be obtained according to the initial APL value. The implementation manner of obtaining the initial Gain value in the embodiment of the present invention is as follows, and the calculation method of the initial APL value of the static picture is:

APL ₀ =Sum/Max;

Among them, APL ₀ is the initial APL value, Sum is the total brightness of a frame when the display screen is displayed in full screen, and Max is the peak brightness of a frame;

Sum=Sum_tmp=(Lr_Sum+Lg_Sum)+(Lb_Sum+Lw_Sum);

Among them, Sum_tmp is the total value of the current brightness, Lr_Sum is the total value of the brightness of the red sub-pixel, Lg_Sum is the total value of the brightness of the green sub-pixel, Lb_Sum is the total value of the brightness of the blue sub-pixel, and Lw_Sum is the total value of the brightness of the white sub-pixel;

Max=3840*2*2160*1048575.

It should be noted that the above is only a schematic representation of the Max value. There are other possible values for Max, but the Max value is determined and represents the total brightness of the maximum screen. The brightness of the screen varies with the displayed screen. The values are not the same, but will not exceed Max.

The initial APL value of the static picture can be obtained through the above formula. For a certain static picture, there is a one-to-one correspondence between the initial APL value and the initial Gain value, and the initial Gain value of the static picture can be determined directly according to the initial APL value, for example The Gain value calculation method in the High-Dynamic Range (High-Dynamic Range, referred to as: HDR) algorithm is adopted, and the following settings are used:

i=(Sum/Max)*255=APL*255; wherein, since each pixel of a normal picture has a gray scale range of 0 to 255, i=APL*255 is set to perform the calculation of Gain ₀ .

In addition, for different types of pictures, the results of calculating the initial Gain value, for example, include:

1), the area below 10% of the monochrome screen: Gain ₀ = 256;

2), the area of 10% to 25% of the monochrome screen: Gain ₀ =-4.462*i+312.9;

3) The area of 25% to 100% of the monochrome screen: Gain ₀ =0.009999*i^2-2.709*i+246.9;

4) In the color mixing screen area, the current is relatively high, the full-screen target brightness drops to 80 nits (nit), and Gain ₀ =0.1673*i+85.33.

According to the above calculation method, the initial Gain value of the static image, that is, the Gain value before luminance attenuation can be obtained.

S120, according to the initial Gain value of the static picture, the stable Gain value after the static picture is attenuated, and the preset decay time, obtain the gain value decay rate;

S130 , perform brightness attenuation processing on the static image according to the Gain value attenuation rate, and obtain a stable brightness value of the static image after the attenuation is completed.

In the embodiment of the present invention, the attenuation of the brightness of the static image can be achieved by the attenuation of the Gain value. For example, a stable Gain value after the static image has been attenuated can be set, and the stable Gain value can be defined by a relational formula. , the decay time is preset (for example, the decay time in the embodiment of the present invention is set to 256 seconds), therefore, the decay rate of the Gain value of the static image during the decay process can be calculated, and the decay rate of the Gain value is the static The standard for image attenuation. Subsequently, the brightness attenuation process can be performed on the static image at the determined decay rate of the Gain value, that is, the attenuation is performed at a rate determined per second within the preset decay time, until the preset decay time is reached, and the decay is completed. At this time, The stable brightness value of the static image after the attenuation can be obtained, that is, the final effect of brightness attenuation performed by the embodiment of the present invention.

In the embodiment of the present invention, the method of setting the stable Gain value may be: according to the HDR algorithm, when the full-screen display of the mixed color picture under 255 grayscale is set as the minimum value of Gain, which is recorded as Gain _min (this Gain _min can be designed by The staff thinks that it is set, and Gain _min is less than Gain ₀ ), and the ratio of the brightness attenuation of the full-screen display under a fixed grayscale is set as q, so that the stable Gain value can be obtained: Gain _min *(1-q). According to the above-mentioned initial Gain value (Gain ₀ ), the stable Gain value after the decay is completed (ie Gain _min *(1-q)), and the preset decay time, the decay rate of the Gain value can be calculated. In addition, the initial brightness of a frame of a static image can also be defined as: L*Gain ₀ , where L represents the red, green, and blue sub-pixels (Red, Green, Blue, abbreviated as: RGB) plus a white sub-pixel (White) ( That is, the brightness after RGB-RGBW), and set L' as the stable brightness value after the static image is attenuated, L'=L*Gain _min *(1-q), L is the current (that is, before the brightness attenuation is not performed) The brightness value of the screen.

In the brightness attenuation method in the prior art, the brightness of the static image is only used as the initial condition of attenuation, and the brightness attenuation of each sub-pixel of the static image is multiplied by a proportional coefficient less than 1. Since the same attenuation ratio is used, and processing with the same decay time, it will cause the final stable brightness to be too low to affect the viewing effect when the initial image is low-brightness. In a static color picture, when the APL value of the picture changes, the final stable brightness after brightness attenuation with different attenuation ratios is inconsistent, resulting in color cast.

In contrast, the embodiment of the present invention obtains the corresponding initial Gain value according to the initial APL value of the static picture, sets the stable Gain value after the attenuation is completed, and performs attenuation processing on the static picture according to the calculated gain value attenuation rate, Taking the stable brightness gain after attenuation as the final result of brightness attenuation, the stable brightness value of the static image after attenuation is obtained. In this process, the method of obtaining the initial Gain value is based on the correspondence between the APL value and the Gain value in the HDR algorithm. For pictures with different colors and initial effects, the initial Gain value corresponding to the initial APL value is different. Therefore, the embodiments of the present invention provide Brightness processing method, for different types of static pictures (such as static pictures with different colors and initial effects), the brightness attenuation is performed at the matching Gain value attenuation rate during the processing process, which can be more suitable for the current static picture. Attenuation, and after the attenuation is completed, a stable brightness value with higher adaptability is obtained.

In the brightness processing method provided by the embodiment of the present invention, the initial Gain value of the static picture is obtained according to the initial APL value of the static picture, and the Gain value is calculated according to the initial Gain value, the Gain value after the static picture has been attenuated, and the preset decay time. value attenuation rate, so that the static image is subjected to brightness attenuation processing using the Gain value attenuation rate, and an appropriate stable brightness value is obtained after the attenuation is completed; the brightness processing method provided by the embodiment of the present invention can be and the static image of the initial effect), the brightness attenuation is performed at the matching Gain value attenuation rate during the processing, and a stable brightness value with high adaptability is obtained after the attenuation is completed. In addition, for static images of different colors, based on the initial APL value The calculated Gain value attenuation rate is used for brightness attenuation to avoid the phenomenon of color shift after attenuation; it solves the brightness attenuation method in the prior art, because a single form of brightness attenuation method is used for static images in different initial states, resulting in attenuation. The resulting stable brightness has poor adaptability, and is prone to afterimage and color cast problems.

Optionally, in the embodiment of the present invention, according to the expression formula of the stable Gain value after the attenuation is completed, it can be known that the attenuation rate of the Gain value of the static picture is:

V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ;

Among them, Gain ₀ is the initial Gain value, t _max is the preset attenuation time, Gain _min is the minimum gain of the static image, q is the preset attenuation ratio, Gain _min *(1-q) is the stable Gain after the attenuation is completed value.

In this embodiment of the present invention, based on the gray scale range of 0 to 255 for each pixel in a common picture, for example, the preset decay time t _max may be set to 256 seconds (s), the initial Gain value, the stable Gain value and Decay time, you can get the decay rate of Gain value. In the process of brightness attenuation, V_gain is used for attenuation processing. When the attenuation time reaches 256s, the attenuation is ended.

Optionally, the method provided in the embodiment of the present invention may further include:

Adjust the attenuation ratio according to the stable brightness value after the static image is attenuated.

In this embodiment of the present invention, the attenuation ratio q may be preset to a fixed value of 0.5, for example. If the attenuation ratio is too large or the final stable brightness value is too low, the q attenuation ratio can be adjusted to obtain a more adaptive stability Brightness value.

Optionally, FIG. 2 is a flowchart of another brightness processing method provided by an embodiment of the present invention. On the basis of the embodiment shown in FIG. 1 , after S120, the method provided by the embodiment of the present invention may further include:

S121, obtain the current Gain value of the static image during the decay process according to the initial Gain value, the decay rate of the Gain value, and the decayed time;

S122, obtaining the current brightness value of the static image in the decay process according to the current Gain value.

In this embodiment of the present invention, the current Gain value of the static image during the decay process refers to the Gain value during the decay process (that is, at a certain time point within the preset decay time), that is, the decay starts from the initial Gain value , the current Gain value is the middle amount of the Gain value in the decay process, and correspondingly, the current brightness value corresponding to the current Gain value can be obtained. The current Gain value in the embodiment of the present invention is: Gain _t =Gain ₀ -V_gain*t, Gain _t represents the Gain value of the static image at the decay time t, and the current luminance value is: L _t =L*Gain _t =L* (Gain ₀ -V_gain*t), L _t represents the luminance value of the static picture at the decayed time t.

In the embodiment of the invention, the implementation manner of obtaining the stable brightness value of the static image after the attenuation is completed may include:

When the decay time reaches the preset decay time, the calculated stable brightness value is:

L'=L*(Gain ₀ -V_gain*t _max ); wherein, L is the brightness after RGB-RGBW;

When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as the stable luminance value.

According to the above calculation method of the stable brightness value, if the decay time has reached the preset decay time, it means that the brightness decay has been completed. At this time, the stable brightness value can be calculated according to the initial Gain value, the decay rate of the Gain value and the preset decay time. That is, the above L _' ; if the decay time has not reached the preset decay time, the decay process can be continued. When the brightness is the same, it means that the displayed image is still a static image, and the brightness is attenuated through V_gain. When the brightness is different, it means that the displayed image has changed, and the newly input brightness is used as the stable brightness value.

Optionally, FIG. 3 is a flowchart of still another brightness processing method provided by an embodiment of the present invention. On the basis of the foregoing embodiment, before S110, the method provided in this embodiment of the present invention may further include:

S100, determining the static judgment time of the display screen according to the initial APL value of the display screen;

S101, within the static judgment time, perform static judgment according to the picture brightness of each frame of the display picture.

In the embodiment of the present invention, before performing brightness attenuation processing on a static image, it is first necessary to determine whether the image displayed by the display is a static image. The same static judgment time. However, in the small window state with high gray scale, the brightness of the picture is very high. When the high brightness state is maintained for a long time, it is easy to produce afterimages. Therefore, during the process of brightness attenuation, for static pictures with high brightness, you can shorten the display by shortening the display. The static judgment time of the screen to avoid the phenomenon of afterimages on the display. In practical applications, the length of the static judgment time can be set according to the size of the initial APL value of the static picture, and then, according to the determined static judgment time, the static judgment is performed according to the picture brightness of each frame of the displayed picture within the actual situation. Judgment, for example, the total brightness of the current frame can be compared with the total brightness of the previous frame. After multiple cyclic comparisons, when the static judgment time is reached, the sum of the brightness of each frame is equal, then it is considered that the current The displayed screen is a static screen. The embodiment shown in FIG. 3 is illustrated based on the above-mentioned process shown in FIG. 1 as an example.

In an implementation manner of the embodiment of the present invention, the implementation manner of determining the static judgment time of the display screen according to the initial APL value of the display screen may include:

When the initial APL value is in [0, 0.05], T=-1000*APL ₀ +60;

When the initial APL value is at (0.05, 0.5], T=111*APL ₀ +4.45;

When the initial APL value is at (0.5, 1], T=100*APL ₀ +110.

It should be noted that the APL value of a monochrome image in a 10% window and a grayscale of 255 is 0.05; the APL value of a monochrome image in a 100% window and a grayscale of 255 is 0.5; the embodiment of the present invention is directed to display images with different APL values , The static judgment time adopts segmented linear processing to reduce the afterimage effect of the static picture of the small window under high gray scale. As shown in FIG. 4 , it is a graph showing a relationship between an APL value and a static judgment time in the brightness processing method provided by the embodiment of the present invention.

In the embodiment of the present invention, the time for static judgment is limited by the initial APL value of the displayed image, which is beneficial to shorten the overall time for brightness attenuation of the static image, and can effectively avoid the aging of the displayed TFT caused by the display screen displaying a high-brightness image for a long time. The phenomenon of afterimages.

FIG. 5 is a flowchart of still another brightness processing method provided by an embodiment of the present invention. FIG. 5 illustrates the flowchart of the brightness processing method provided by an embodiment of the present invention by way of an implementation example. The flowchart shown in FIG. 5 may include the following steps:

S201, obtain the brightness sum of the previous frame in the display picture, which is represented as Sum _t-1 ;

S202, obtain the brightness sum of the current frame in the display screen, which is represented as Sum _t ;

Wherein, the sum of the brightness of each frame is Sum; the sum of the brightness of the current frame is represented by Sum _t , and the sum of the brightness of the previous frame is represented by Sum _t-1 , and the calculation method of Sum is the same as in the above-mentioned embodiment, so it is not repeated here. .

S203, the current frame of the display screen is successively advanced to the previous frame, that is, N _t-1 =N _t , in the process of acquiring Sum _t , the current frame N _t becomes the previous frame in turn, that is, as time progresses, The sum of the brightness of the current frame N _t can be continuously obtained, Sum _t .

S204, determine whether the total brightness of the current frame is always equal to the total brightness of the previous frame, that is, determine whether Sum _t ==Sum _t-1 ? , when there is a situation that Sum _t is not equal to Sum _t-1 , execute S205; when it is constant, execute S207.

That is to say, during the judgment time, only the sum of the brightness of the current frame is always equal to the sum of the brightness of the previous frame, and the currently displayed picture is a static picture; if at a certain moment, the sum of the brightness of the current frame is not equal to the sum of the brightness of the previous frame , indicating that the display screen has changed, that is, it is determined that the display screen is not a static screen.

S205, the sum of the brightness of the current frame is equal to the sum of the brightness of the next frame, namely Sum _t-1 =Sum _t ;

S206, setting the current frame as the previous frame of the display screen, and then returning to S202.

In this embodiment of the present invention, in S205, Sum _t-1 =Sum _t is established, that is, at a certain moment in S204, it is determined that the identity does not hold, and when Sum _t-1 =Sum _t , the current frame is regarded as the previous frame It is judged whether the display screen is a static screen or not.

S207, determining whether the number of frames currently judged is equal to the number of frames to be judged;

That is, judge N _t =60*T(APL ₀ )? , if it is determined to be yes, execute S208 , and if it is determined to be no, return to execute S201 , that is, continue to determine whether the displayed picture is a static picture according to the number of frames.

Among them, T(APL ₀ ) is the judgment time of static pictures under APL ₀ , 60 means 1s judges 60 frames, the right side of the equation means the number of frames to be judged under APL ₀ , and N _t means the number of frames currently judged. It should be noted that, the manner of determining the judgment time of the static picture according to the initial APL value (APL ₀ ) of the picture has been described in detail in the above-mentioned embodiment, so it will not be repeated here.

S208, after completing the above-mentioned judgments from S201 to S207, it can be known that the currently displayed picture is a static picture, and at this time, the corresponding Gain ₀ is obtained according to the APL ₀ of the static picture;

S209, calculate the gain value attenuation rate of the static image, and perform brightness attenuation on the static image through the Gain value attenuation rate;

S210 , in the process of luminance attenuation, calculate the current Gain value of the static image, where the current Gain value is: Gain _t =Gain ₀ −V_gain*t.

S211, according to the current Gain value, calculate the current brightness value of the static picture, where the current brightness value is: L _t =L*Gain _t =L*(Gain ₀ -V_gain*t);

S212, judge whether the decayed time has reached the preset decay time, that is, judge whether t≥t _max ? ; The preset decay time is t _max , when t≥t _max , execute S213, and when t<t _max , execute S214.

S213, calculate the stable brightness value of the static image after the brightness attenuation is completed, and the stable brightness value is: L'=L*(Gain ₀ -V_gain*t _max );

S214, continue to judge whether the total brightness of the current frame is always equal to the total brightness of the previous frame, that is, continue to judge Sum _t ==Sum _t-1 ? , when there is a situation that Sum _t is not equal to Sum _t-1 , execute S215; when it is constant, return to execute S209;

S215, take the newly input brightness as a stable brightness value.

That is to say, within the preset decay time, as long as the sum of the brightness of the current frame is always equal to the sum of the brightness of the previous frame, it means that the currently displayed picture is still a static picture, then return to continue to attenuate the brightness of the static picture; The sum of the brightness of the current frame is not equal to the sum of the brightness of the previous frame, indicating that the display image has changed, that is, it is judged that the display image is not a static image, and the newly input brightness is used as the stable brightness value at this time.

In the brightness processing method provided by the embodiment of the present invention, after judging that the picture currently displayed on the display is a static picture, according to the relationship between the stable Gain value after attenuation and the initial Gain value, that is, the attenuation rate of the Gain value, as the basis for brightness attenuation, The brightness of the currently displayed static picture is attenuated, and finally the stable brightness value of the static picture is obtained, so as to avoid the final stabilization caused by the different brightness attenuation ratios for static pictures of different colors in the prior art, as the APL value of the static picture changes. Brightness is inconsistent, causing color cast problems. As shown in FIG. 6 , which is an effect diagram after the brightness attenuation is performed by using the brightness processing method provided by the embodiment of the present invention, FIG. 6 shows the relationship between the APL value of each sub-pixel in the RGBW of the static picture and the ratio of brightness reduction, which can be It can be seen that with the change of the APL value, the attenuation ratio of RGBW has the same trend, and the attenuation ratio value is relatively close, which largely avoids the color shift problem in the prior art.

Based on the brightness processing methods provided by the foregoing embodiments of the present invention, an embodiment of the present invention further provides a brightness processing apparatus, which is configured to execute the brightness processing method provided by any of the above embodiments of the present invention.

As shown in FIG. 7 , it is a schematic structural diagram of a luminance processing apparatus provided by an embodiment of the present invention. The brightness processing apparatus 30 provided in this embodiment may include: an acquisition module 31 , a rate calculation module 32 , a brightness attenuation module 33 , and a brightness acquisition module 34 .

Wherein, the obtaining module 31 is configured to obtain the initial Gain value of the static picture according to the average brightness APL value of the initial picture of the static picture.

The brightness processing apparatus provided by the embodiment of the present invention is used for performing brightness attenuation processing on a static image displayed by a display. That is to say, the application scenario of the embodiment of the present invention is: when the picture currently displayed by the display is a static picture, the brightness attenuation processing is performed on the static picture. In addition, afterimages are generated, which affects the display effect of the display. Therefore, during the display process of the display, the brightness attenuation processing can be performed on the static images displayed for a long time to reduce the display brightness of the display, thus protecting the display performance and delay of the display. The role of display life.

In the embodiment of the present invention, it can be determined whether the currently displayed picture is a static picture by judging the sub-pixels in the pictures before and after the display process. After judging that the currently displayed picture is a static picture, the static picture is known. The acquisition module 31 can acquire the initial Gain value of the static picture according to the initial APL value. In the embodiment of the present invention, the implementation manner of acquiring the initial Gain value by the acquiring module 31 has been described in detail in the above-mentioned embodiments, and thus will not be repeated here. The initial Gain value is the Gain value before brightness attenuation is performed.

The rate calculation module 32 is used for obtaining the decay rate of the Gain value according to the initial Gain value of the static image, the stable Gain value after the static image is attenuated, and the preset decay time;

The brightness attenuation module 33 is used to perform brightness attenuation processing on the static image through the Gain value attenuation rate;

The brightness obtaining module 34 is configured to obtain the stable brightness value of the static image after the attenuation is completed.

In the embodiment of the present invention, the attenuation of the brightness of the static image can be achieved by the attenuation of the Gain value. For example, a stable Gain value after the static image has been attenuated can be set, and the stable Gain value can be defined by a relational formula. , the decay time is preset (for example, the decay time in this embodiment of the present invention is set to 256 seconds), therefore, the rate calculation module 32 can calculate the decay rate of the Gain value of the static image during the decay process, and the Gain value decays The rate is the standard for attenuating static images. Subsequently, the brightness attenuation module 33 may perform brightness attenuation processing on the static image at the determined gain value attenuation rate, that is, the attenuation is performed at a rate determined per second within the preset attenuation time, until the preset attenuation time is reached, and the attenuation is completed. , at this time, the brightness acquisition module 34 can acquire the stable brightness value of the static image after the attenuation is completed, that is, the final effect of the implementation of the brightness attenuation in the embodiment of the present invention.

In the brightness attenuation method in the prior art, the brightness of the static image is only used as the initial condition of attenuation, and the brightness attenuation of each sub-pixel of the static image is multiplied by a proportional coefficient less than 1. Since the same attenuation ratio is used, and processing with the same decay time, it will cause the final stable brightness to be too low to affect the viewing effect when the initial image is low-brightness. In a static color picture, when the APL value of the picture changes, the final stable brightness after brightness attenuation with different attenuation ratios is inconsistent, resulting in color cast.

In contrast, the embodiment of the present invention obtains the corresponding initial Gain value according to the initial APL value of the static picture, sets the stable Gain value after the attenuation is completed, and performs attenuation processing on the static picture according to the calculated gain value attenuation rate, Taking the stable brightness gain after attenuation as the final result of brightness attenuation, the stable brightness value of the static image after attenuation is obtained. In this process, the method of obtaining the initial Gain value is based on the correspondence between the APL value and the Gain value in the HDR algorithm. For pictures with different colors and initial effects, the initial Gain value corresponding to the initial APL value is different. Therefore, the embodiments of the present invention provide The brightness processing device, for different types of static pictures (for example, static pictures with different colors and initial effects), uses the matching Gain value attenuation rate to perform brightness attenuation in the processing process, and can perform brightness in a way more suitable for the current static picture. Attenuation, and after the attenuation is completed, a stable brightness value with higher adaptability is obtained.

In the brightness processing device provided by the embodiment of the present invention, the acquisition module acquires the initial Gain value of the static picture according to the initial APL value of the static picture, and the rate calculation module obtains the initial Gain value of the static picture according to the initial Gain value, the attenuated Gain value and the preset value of the static picture. Decay time, calculate the gain value attenuation rate, so that the brightness attenuation module uses the Gain value attenuation rate to perform brightness attenuation processing on the static image, and after the attenuation is completed, the brightness acquisition module obtains an appropriate stable brightness value; the brightness processing provided by the embodiment of the present invention The device, for different types of static pictures (for example, static pictures with different colors and initial effects), adopts the matching Gain value attenuation rate to perform brightness attenuation in the processing process, and obtains a stable brightness value with high adaptability after the attenuation is completed. In addition, for static pictures of different colors, brightness attenuation is performed based on the attenuation rate of the Gain value calculated from the initial APL value to avoid the phenomenon of color shift after attenuation; the brightness attenuation method in the prior art is solved. The static image adopts a single form of brightness attenuation, resulting in poor adaptability of the stable brightness obtained after attenuation, and prone to afterimage and color cast problems.

Optionally, in this embodiment of the present invention, the decay rate of the Gain value calculated by the rate calculation module 32 is:

V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ;

Among them, Gain ₀ is the initial Gain value, t _max is the preset attenuation time, Gain _min is the minimum gain of the static image, q is the preset attenuation ratio, Gain _min *(1-q) is the stable Gain after the attenuation is completed value.

In the embodiment of the present invention, based on the gray scale range of 0 to 255 for each pixel in a common picture, for example, the preset decay time t _max can be set to 256s, and the initial Gain value, stable Gain value and decay time can be known. Get the decay rate of the Gain value. In the process of brightness attenuation, V_gain is used for attenuation processing. When the attenuation time reaches 256s, the attenuation is ended.

Optionally, FIG. 8 is a schematic structural diagram of another luminance processing apparatus provided by an embodiment of the present invention. On the basis of the structure of the apparatus shown in FIG. 7 , the luminance processing apparatus provided by the embodiment of the present invention may further include:

The adjustment module 35 is configured to adjust the attenuation ratio according to the stable brightness value after the static image has been attenuated.

In the embodiment of the present invention, the attenuation ratio q in the initial calculation by the rate calculation module 32 may be preset to a fixed value of 0.5, for example, if the attenuation ratio is too large or the final stable brightness value is too low, the q attenuation ratio can be adjusted, In order to obtain a more adaptable and stable brightness value.

Optionally, the brightness processing apparatus provided in the embodiment of the present invention may further include:

The intermediate value calculation module 36 is used to obtain the current Gain value of the static image in the decay process according to the initial Gain value, the Gain value decay rate and the decay time;

The intermediate value calculation module 36 is further configured to obtain the current brightness value of the static image during the attenuation process according to the current Gain value.

In this embodiment of the present invention, the current Gain value of the static image during the decay process refers to the Gain value during the decay process (that is, at a certain time point within the preset decay time), that is, the decay starts from the initial Gain value , the current Gain value is the middle amount of the Gain value in the decay process, and correspondingly, the current brightness value corresponding to the current Gain value can be obtained. The current Gain value in the embodiment of the present invention is: Gain _t =Gain ₀ -V_gain*t, Gain _t represents the Gain value of the static image at the decay time t, and the current luminance value is: L _t =L*Gain _t =L* (Gain ₀ -V_gain*t), L _t represents the luminance value of the static picture at the decayed time t.

In the embodiment of the present invention, an implementation manner for the brightness obtaining module 34 to obtain the stable brightness value of the static image after the attenuation is completed may include:

When the decay time reaches the preset decay time, the calculated stable brightness value is:

L'=L*(Gain ₀ -V_gain*t _max ); wherein, L is the brightness after RGB-RGBW;

When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as the stable luminance value.

According to the above calculation method of the stable brightness value, if the decay time has reached the preset decay time, it means that the brightness decay has been completed. At this time, the stable brightness value can be calculated according to the initial Gain value, the decay rate of the Gain value and the preset decay time. That is, the above L _' ; if the decay time has not reached the preset decay time, the decay process can be continued. When the brightness is the same, it means that the displayed image is still a static image, and the brightness is attenuated through V_gain. When the brightness is different, it means that the displayed image has changed, and the newly input brightness is used as the stable brightness value.

Optionally, FIG. 9 is a schematic structural diagram of another luminance processing apparatus provided by an embodiment of the present invention. On the basis of the foregoing embodiment, the luminance processing apparatus provided by an embodiment of the present invention may further include:

The time determination module 37 is used for determining the static judgment time of the displayed image according to the average brightness APL value of the initial image of the displayed image;

The static judgment module 38 is configured to perform static judgment according to the picture brightness of each frame of the displayed picture within the static judgment time. The embodiment shown in FIG. 9 is shown on the basis of the structure of the device shown in FIG. 7 as an example.

In the embodiment of the present invention, before the brightness attenuation module 33 performs brightness attenuation processing on a static image, it first determines whether the image displayed by the display is a static image. The static pictures have the same static judgment time. However, in the small window state of high gray scale, the brightness of the picture is very high. If the high brightness state is maintained for a long time, it is easy to produce afterimages. Therefore, during the process of brightness attenuation, for static pictures with high brightness, the display can be shortened by shortening the display time. The static judgment time of the screen to avoid the phenomenon of afterimages on the display. In practical applications, the length of the static judgment time can be set according to the size of the initial APL value of the static picture, and then, according to the determined static judgment time, the static judgment is carried out according to the picture brightness of each frame of the displayed picture within the actual situation. Judgment, for example, the total brightness of the current frame can be compared with the total brightness of the previous frame. After multiple cyclic comparisons, when the static judgment time is reached, the total brightness of each frame is equal, then it is considered that the current The displayed screen is a static screen.

It should be noted that, in the embodiment of the present invention, the method for determining the static judgment time of the display screen by the time determination module 37, that is, the method for determining the static judgment time by the initial APL value, and the beneficial effects achieved are the same as those in the above-mentioned embodiment. This will not be repeated here.

FIG. 10 is a schematic structural diagram of a computer device according to an embodiment of the present invention. The computer device 40 provided in this embodiment of the present invention may include: a memory 41 and a processor 42 .

Wherein, the memory 41 is used to save executable instructions;

The processor 42 is configured to implement the brightness processing method provided by any of the foregoing embodiments of the present invention when executing the executable instructions stored in the memory 41 .

The implementation manner of the computer device 40 provided by the embodiment of the present invention is basically the same as the brightness processing method provided by the above-mentioned embodiment of the present invention, which is not repeated here.

Embodiments of the present invention further provide a computer-readable storage medium, where executable instructions are stored in the computer-readable storage medium, and when the executable instructions are executed by a processor, the brightness processing method provided by any of the foregoing embodiments of the present invention can be implemented. The implementation manner of the computer-readable storage medium provided by the embodiment of the present invention is basically the same as that of the brightness processing method provided by the above-mentioned embodiment of the present invention, which is not repeated here.

Although the embodiments disclosed in the present invention are as above, the described contents are only the embodiments adopted to facilitate the understanding of the present invention, and are not intended to limit the present invention. Any person skilled in the art to which the present invention belongs, without departing from the spirit and scope disclosed by the present invention, can make any modifications and changes in the form and details of the implementation, but the scope of the patent protection of the present invention still needs to be The scope defined by the appended claims shall prevail.

Claims (13)

1. a brightness processing method, is characterized in that, comprises: Obtain the initial brightness gain Gain value of the static picture according to the average brightness APL value of the initial picture of the static picture; According to the initial Gain value of the static picture, the stable Gain value after the static picture completes the attenuation, and the preset attenuation time, obtain the gain value attenuation rate; Perform brightness attenuation processing on the static image according to the Gain value attenuation rate, and obtain a stable brightness value of the static image after the attenuation is completed. 2. brightness processing method according to claim 1, is characterized in that, the Gain value decay rate of described static picture is: V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ; Wherein, the Gain ₀ is the initial Gain value, the t _max is the preset attenuation time, the Gain _min is the minimum gain of the static image, the q is the preset attenuation ratio, and the Gain _min *(1-q) is the stable Gain value after the decay is completed. 3. The luminance processing method according to claim 2, further comprising: The attenuation ratio is adjusted according to the stable brightness value of the static image after the attenuation is completed. 4 . The brightness processing method according to claim 2 , wherein after acquiring the decay rate of the Gain value of the static image, the method further comprises: 5 . Obtain the current Gain value of the static image during the decay process according to the initial Gain value, the decay rate of the Gain value and the decayed time; Obtain the current brightness value of the static image in the decay process according to the current Gain value; The obtaining of the stable brightness value of the static image after the attenuation is completed includes: When the decayed time reaches the preset decay time, calculate the stable brightness value as: L'=L*(Gain ₀ -V_gain*t _max ); wherein, the L represents the brightness of the red, green and blue sub-pixels after adding the white sub-pixels (RGB-RGBW); When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as a stable luminance value. 5. The brightness processing method according to claim 1, further comprising: Determine the static judgment time of the display picture according to the average brightness APL value of the initial picture of the display picture; During the static judgment time, static judgment is performed according to the picture brightness of each frame of the display picture. 6. The brightness processing method according to claim 5, wherein the determining the static judgment time of the display screen according to the initial APL value of the display screen comprises: When the initial APL value is 0 to 0.05, the static judgment time is: T=-1000*APL ₀ +60; When the initial APL value is 0.05 to 0.5, the static judgment time is: T=111*APL ₀ +4.45; When the initial APL value is 0.5 to 1, the static judgment time is: T=100*APL ₀ +110; Wherein, the T is the static judgment time, and the APL ₀ is the initial APL value. 7. A brightness processing device, comprising: an acquisition module, configured to acquire the initial brightness gain Gain value of the static picture according to the average brightness APL value of the initial picture of the static picture; a rate calculation module, configured to obtain the gain value decay rate according to the initial Gain value of the static image, the stable Gain value after the static image has been attenuated, and a preset decay time; A brightness attenuation module, configured to perform brightness attenuation processing on the static image by using the Gain value attenuation rate; A brightness acquisition module, configured to acquire the stable brightness value of the static image after the attenuation is completed. 8. The luminance processing device according to claim 7, wherein the rate calculation module calculates the decay rate of the Gain value as: V_gain=(Gain ₀ -Gain _min *(1-q))/t _max ; Wherein, the Gain ₀ is the initial Gain value, the t _max is the preset attenuation time, the Gain _min is the minimum gain of the static image, the q is the preset attenuation ratio, and the Gain _min *(1-q) is the stable Gain value after the decay is completed. 9. The luminance processing device according to claim 8, further comprising: An adjustment module, configured to adjust the attenuation ratio according to the stable brightness value after the static image has been attenuated. 10. The luminance processing device according to claim 8, further comprising: an intermediate value calculation module, configured to obtain the current Gain value of the static image during the decay process according to the initial Gain value, the decay rate of the Gain value and the decayed time; The intermediate value calculation module is further configured to obtain the current brightness value of the static image in the decay process according to the current Gain value; The brightness obtaining module obtains the stable brightness value of the static image after the attenuation is completed, including: When the decayed time reaches the preset decay time, calculate the stable brightness value as: L'=L*(Gain ₀ -V_gain*t _max ); wherein, the L represents the brightness of the red, green and blue sub-pixels after adding the white sub-pixels (RGB-RGBW); When the decayed time has not reached the preset decay time, it is determined according to the current luminance value to continue the luminance decay process or to use the newly input luminance as a stable luminance value. 11. The luminance processing device according to claim 7, further comprising: a time determination module, configured to determine the static judgment time of the display image according to the average brightness APL value of the initial image of the display image; The static judgment module is configured to perform static judgment according to the picture brightness of each frame of the displayed picture within the static judgment time. 12. A computer device, comprising: a memory and a processor; the memory for storing executable instructions; The processor is configured to implement the brightness processing method according to any one of claims 1 to 6 when executing the executable instructions stored in the memory. 13. A computer-readable storage medium, wherein the computer-readable storage medium stores executable instructions, and when the executable instructions are executed by a processor, the implementation of any one of claims 1 to 6 is realized. brightness processing method.

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