CN108847201B - Brightness processing method and device, computer equipment and readable storage medium - Google Patents
Brightness processing method and device, computer equipment and readable storage medium Download PDFInfo
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- CN108847201B CN108847201B CN201810752151.0A CN201810752151A CN108847201B CN 108847201 B CN108847201 B CN 108847201B CN 201810752151 A CN201810752151 A CN 201810752151A CN 108847201 B CN108847201 B CN 108847201B
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Abstract
The embodiment of the invention discloses a brightness processing method, a brightness processing device, computer equipment and a readable storage medium. The brightness processing method comprises the following steps: acquiring an initial brightness Gain (Gain) value of the static picture according to the initial APL value of the static picture; obtaining a Gain value attenuation rate according to the initial Gain value of the static picture, the stable Gain value after the static picture finishes attenuation and preset attenuation time; and performing brightness attenuation processing on the static picture through the Gain value attenuation rate, and acquiring a stable brightness value of the static picture after the static picture is attenuated. The embodiment of the invention solves the problems that in the brightness attenuation mode in the prior art, because a single-form brightness attenuation mode is adopted for static pictures in different initial states, stable brightness obtained after attenuation is not suitable for the current application scene, and afterimages and color cast are easy to generate.
Description
Technical Field
The present application relates to, but not limited to, the field of display technologies, and in particular, to a brightness processing method and apparatus, a computer device, and a readable storage medium.
Background
With the development of display technology, users have higher and higher requirements for the intelligent functions of the display, for example, a static picture in a high-brightness state is lighted for a long time, which easily causes TFT aging and afterimage generation, thereby affecting the display effect of the display, and therefore, the display is required to perform brightness attenuation processing on the static picture by itself.
The general way of performing the brightness attenuation process at present may be: the brightness of each sub-pixel of the current still picture is attenuated, and the brightness of each sub-pixel can be multiplied by a scaling factor smaller than 1, and the attenuation mode is simple to implement, but has the following defects: firstly, static pictures with different initial brightness adopt the same number attenuation proportion, and for the static pictures with lower initial brightness, stable brightness obtained after attenuation is stable is too low, so that the watching effect of a user is influenced; secondly, the static pictures with different initial brightness adopt the same number of attenuation time, and the screen is easy to generate residual images in the attenuation process for the static pictures with higher initial brightness; thirdly, for different color static pictures, when the average brightness (APL) values of the pictures are different, different brightness attenuation ratios are adopted, which causes different steady brightness after different APL values are attenuated, thereby generating color cast. Obviously, in the brightness attenuation mode in the prior art, a single-form brightness attenuation mode is adopted for static pictures in different initial states, so that stable brightness obtained after attenuation may not be suitable for a current application scene, and afterimages and color cast are easily generated.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a luminance processing method, a luminance processing apparatus, a computer device, and a readable storage medium, so as to solve the problems that in a luminance attenuation manner in the prior art, a single-form luminance attenuation manner is adopted for static pictures in different initial states, so that stable luminance obtained after attenuation may not be suitable for a current application scene, and afterimages and color cast are easily generated.
The embodiment of the invention provides a brightness processing method, which comprises the following steps:
acquiring an initial brightness Gain value of the static picture according to the initial picture average brightness APL value of the static picture;
obtaining a Gain value attenuation rate according to the initial Gain value of the static picture, the stable Gain value of the static picture after the static picture finishes attenuation and preset attenuation time;
and performing brightness attenuation processing on the static picture through the Gain value attenuation rate, and acquiring a stable brightness value of the static picture after the static picture is attenuated.
Optionally, in the luminance processing method as described above, the Gain value decay rate of the still picture is:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein the Gain0Is the initial Gain value, the tmaxFor a preset decay time, the GainminThe minimum value of Gain of the static picture is q is a preset attenuation proportion, and the GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
Optionally, in the brightness processing method as described above, the method further includes:
and adjusting the attenuation ratio according to the stable brightness value of the static picture after the attenuation is finished.
Optionally, in the luminance processing method as described above, after obtaining the Gain value decay rate of the still picture, the method further includes:
acquiring the current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate and the attenuated time;
obtaining the current brightness value of the static picture in the attenuation process according to the current Gain value;
the obtaining of the stable brightness value after the static picture is attenuated includes:
when the decay time reaches the preset decay time, calculating the stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L represents the luminance of the RGB sub-pixel after adding the white sub-pixel (RGB-RGBW);
and when the decayed time does not reach the preset decayed time, determining to continue the brightness decay processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
Optionally, in the brightness processing method as described above, the method further includes:
determining static judgment time of the display picture according to the APL value of the initial picture average brightness of the display picture;
and in the static judgment time, performing static judgment according to the image brightness of each frame of the display image.
Optionally, in the brightness processing method described above, the determining the static determination time of the display screen according to the initial APL value of the display screen includes:
when the initial APL value is 0 to 0.05, the static judgment time is:
T＝-1000*APL0+60；
when the initial APL value is 0.05 to 0.5, the static judgment time is as follows:
T＝111*APL0+4.45；
when the initial APL value is 0.5 to 1, the static judgment time is:
T＝100*APL0+110；
wherein, T is the static judgment time, APL0Is the initial APL value.
An embodiment of the present invention further provides a luminance processing apparatus, including:
the acquisition module is used for acquiring an initial brightness Gain value of the static picture according to the initial picture average brightness APL value of the static picture;
the rate calculation module is used for acquiring the attenuation rate of the Gain value according to the initial Gain value of the static picture, the stable Gain value of the static picture after the attenuation is finished and the preset attenuation time;
the brightness attenuation module is used for carrying out brightness attenuation processing on the static picture through the Gain value attenuation rate;
and the brightness acquisition module is used for acquiring the stable brightness value of the static picture after the static picture is attenuated.
Optionally, in the brightness processing apparatus as described above, the rate calculating module calculates the Gain value decay rate as:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein the Gain0Is the initial Gain value, the tmaxFor a preset decay time, the GainminThe minimum value of Gain of the static picture is q is a preset attenuation proportion, and the GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
Optionally, the brightness processing apparatus as described above further includes:
and the adjusting module is used for adjusting the attenuation ratio according to the stable brightness value of the static picture after the attenuation is finished.
Optionally, the brightness processing apparatus as described above further includes:
the intermediate value calculating module is used for acquiring the current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate and the attenuated time;
the intermediate value calculating module is further used for obtaining a current brightness value of the static picture in the attenuation process according to the current Gain value;
the acquiring module of the luminance obtains the stable luminance value after the static picture finishes attenuating, including:
when the decay time reaches the preset decay time, calculating the stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L represents the luminance of the RGB sub-pixel after adding the white sub-pixel (RGB-RGBW);
and when the decayed time does not reach the preset decayed time, determining to continue the brightness decay processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
Optionally, the brightness processing apparatus as described above further includes:
the time determining module is used for determining the static judging time of the display picture according to the APL value of the average brightness of the initial picture of the display picture;
and the static judgment module is used for carrying out static judgment according to the image brightness of each frame of the display image within the static judgment time.
An embodiment of the present invention further provides a computer device, including: a memory and a processor;
the memory is used for storing executable instructions;
the processor is used for realizing the brightness processing method according to any one of the above items when the executable instructions stored in the memory are executed.
An embodiment of the present invention further provides a computer-readable storage medium, where executable instructions are stored, and when executed by a processor, the computer-readable storage medium implements the brightness processing method according to any one of the above descriptions.
According to the brightness processing method, the brightness processing device, the computer equipment and the readable storage medium, the initial Gain value of the static picture is obtained according to the initial APL value of the static picture, and the Gain value attenuation rate is calculated according to the initial Gain value, the Gain value after the static picture finishes attenuation and the preset attenuation time, so that the brightness attenuation processing is carried out on the static picture by adopting the Gain value attenuation rate, and a proper stable brightness value is obtained after the attenuation is finished; in the brightness processing method provided by the embodiment of the invention, for the static pictures with different colors and initial effects, the Gain value attenuation rate matched with the static pictures is adopted in the processing process for brightness attenuation, and a stable brightness value with higher adaptability is obtained after attenuation is completed; the method solves the problems that the brightness attenuation mode in the prior art is poor in adaptability of stable brightness obtained after attenuation due to the fact that the brightness attenuation mode in a single form is adopted for static pictures in different initial states, and residual images and color cast are easy to generate.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a luminance processing method according to an embodiment of the present invention;
fig. 2 is a flowchart of another luminance processing method according to an embodiment of the present invention;
fig. 3 is a flowchart of another luminance processing method according to an embodiment of the present invention;
fig. 4 is a graph illustrating a relationship between an APL value and a static determination time in the brightness processing method according to the embodiment of the present invention;
fig. 5 is a flowchart of another luminance processing method according to an embodiment of the present invention;
fig. 6 is a diagram illustrating the effect of brightness attenuation by the brightness processing method according to the 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 according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another luminance processing apparatus according to 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 Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a flowchart of a luminance processing method according to an embodiment of the present invention. The brightness processing method provided by the embodiment of the invention can comprise the following steps:
s110, obtaining the initial brightness Gain (Gain) value of the static picture according to the initial APL value of the static picture.
The brightness processing method provided by the embodiment of the invention is used for performing brightness attenuation processing on a static picture displayed by a display. That is to say, the application scenarios of the embodiment of the present invention are as follows: when the current picture displayed by the display is a static picture, the brightness attenuation treatment is carried out on the static picture, if the display screen of the display displays a high-brightness static picture for a long time, the TFT is easy to age, and afterimages are generated, so that the display effect of the display is influenced.
In the embodiment of the present invention, it may be determined whether the currently displayed picture is a static picture by determining sub-pixels in several frames before and after the display process, and after determining that the currently displayed picture is a static picture, knowing an initial APL value of the static picture, an initial Gain value of the static picture may 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 manner of the initial APL value of the static picture is as follows:
APL0＝Sum/Max；
wherein, APL0The APL value is an initial APL value, Sum is the Sum of the brightness of one frame of picture when the display screen is displayed in a full screen mode, and Max is the brightness peak value of one frame of picture;
Sum＝Sum_tmp＝(Lr_Sum+Lg_Sum)+(Lb_Sum+Lw_Sum)；
wherein, Sum _ tmp is the current brightness total value, Lr _ Sum is the red sub-pixel brightness total value, Lg _ Sum is the green sub-pixel brightness total value, Lb _ Sum is the blue sub-pixel brightness total value, and Lw _ Sum is the white sub-pixel brightness total value;
Max＝3840*2*2160*1048575。
it should be noted that the above is only one schematic representation of Max value, Max has other possible values, but Max value is determined and represents the total brightness value of the maximum picture, and the brightness value of the picture is different from the displayed picture but does not exceed Max.
The initial APL value of a still picture can be obtained by the above formula, and for a certain still picture, the initial APL value and the initial Gain value are in a one-to-one correspondence relationship, and the initial Gain value of the still picture can be determined directly according to the initial APL value, for example, by adopting a Gain value calculation method in a High-Dynamic Range image (HDR) algorithm, the following settings are set:
i ═ Sum/Max) ═ 255 ═ APL ═ 255; wherein, because each pixel of the common picture has a gray scale range of 0-255, i is set to APL 255 for Gain0And (4) calculating.
In addition, the result of calculating the initial Gain value for different types of pictures includes, for example:
1) and the area of the monochrome picture is 10 percent below: gain0＝256；
2) And 10% -25% of monochrome picture: gain0＝-4.462*i+312.9；
3) 25% -100% of monochrome picture: gain0＝0.009999*i^2-2.709*i+246.9；
4) In the mixed color picture area, the current is high, and the brightness of the full screen target is reduced to 80 nit (Gain)0＝0.1673*i+85.33。
According to the above calculation method, the initial Gain value of the still picture, that is, the Gain value before the luminance attenuation is performed, can be obtained.
S120, obtaining a Gain value attenuation rate according to the initial Gain value of the static picture, the stable Gain value of the static picture after the static picture finishes attenuation and preset attenuation time;
s130, performing brightness attenuation processing on the static picture through the Gain value attenuation rate, and acquiring a stable brightness value of the static picture after attenuation is completed.
In the embodiment of the present invention, the luminance attenuation of the still picture may be implemented by attenuating the Gain value, for example, a stable Gain value after the still picture is attenuated may be set, the stable Gain value may be defined by a relational expression, and in addition, the attenuation time is preset (the attenuation time in the embodiment of the present invention is set to 256 seconds, for example), so that the attenuation rate of the Gain value in the attenuation process of the still picture may be calculated, and the attenuation rate of the Gain value is a standard for attenuating the still picture. Then, the luminance attenuation processing may be performed on the still picture at the determined Gain value attenuation rate, that is, within the preset attenuation time, the attenuation may be performed at the rate determined per second until the preset attenuation time is reached, and the attenuation is completed, at this time, the stable luminance value of the still picture after the attenuation is completed may be obtained, that is, the final effect of performing the luminance attenuation according to the embodiment of the present invention.
In the embodiment of the present invention, the stable Gain value may be set by: according to HDR algorithm, when the 255 gray scale lower color mixing picture is displayed in full screen, the minimum value of Gain is set and is marked as Gainmin(the Gain)minCan be set by the designer, and GainminLess than Gain0) And setting the proportion of brightness attenuation of full screen display under the fixed gray scale as q, so as to obtain a stable Gain value as follows: gainmin(1-q). According to the initial Gain value (Gain) described above0) The value of Gain (i.e., Gain) stabilized after completion of the attenuationmin1-q)), and a preset decay time, the Gain value decay rate can be calculated. In addition, the initial brightness of a frame of a still picture can be defined as: l Gain0Wherein L represents the brightness of the Red, Green, Blue (RGB) subpixel (RGB) after the White subpixel (RGB-RGBW) is increased, and L 'is a stable brightness value after the static image is attenuated, and L' is L × Gainmin(1-q), L is the luminance value of the current (i.e. before luminance attenuation is performed) picture.
In the brightness attenuation mode in the prior art, only the brightness of a static picture is taken as an initial condition of attenuation, and a mode of multiplying a proportionality coefficient smaller than 1 to attenuate the brightness of each sub-pixel of the static picture is adopted, because the same attenuation proportion and the same attenuation time are adopted for processing, the final stable brightness is too low to influence the viewing effect under the condition of low brightness of the initial picture, and the final stable brightness is too high to easily generate afterimages under the condition of high brightness of the initial picture; in addition, for static pictures with different colors, when the APL value of the picture changes, the final stable brightness is inconsistent after brightness attenuation is performed by adopting different attenuation ratios, so that color cast can be generated.
In contrast, in the embodiment of the present invention, a corresponding initial Gain value is obtained according to the initial APL value of the static picture, the stable Gain value after the attenuation is completed is set, the attenuation processing is performed on the static picture according to the calculated Gain value attenuation rate, and the stable luminance Gain after the attenuation is taken as the final result of the luminance attenuation, so as to obtain the stable luminance value after the static picture is completely attenuated. In the process, the manner of obtaining the initial Gain value is based on the corresponding manner of the APL value and the Gain value in the HDR algorithm, and the initial Gain values corresponding to the initial APL values are different for pictures with different colors and initial effects, so that the luminance processing method provided by the embodiment of the invention performs luminance attenuation by adopting the Gain value attenuation rate matched with the static pictures with different types (for example, the static pictures with different colors and initial effects) in the processing process, can perform luminance attenuation in a manner more adaptive to the current static picture, and obtains a stable luminance value with higher adaptability after the attenuation is completed.
According to the brightness processing method provided by the embodiment of the invention, the initial Gain value of the static picture is obtained according to the initial APL value of the static picture, and the attenuation rate of the Gain value is calculated according to the initial Gain value, the Gain value of the static picture after attenuation is completed and the preset attenuation time, so that the brightness attenuation processing is carried out on the static picture by adopting the attenuation rate of the Gain value, and a proper stable brightness value is obtained after attenuation is completed; according to the brightness processing method provided by the embodiment of the invention, for different types of static pictures (for example, static pictures with different colors and initial effects), the brightness attenuation is carried out by adopting the Gain value attenuation rate matched with the static pictures in the processing process, and a stable brightness value with higher adaptability is obtained after the attenuation is finished; the method solves the problems that the brightness attenuation mode in the prior art is poor in adaptability of stable brightness obtained after attenuation due to the fact that the brightness attenuation mode in a single form is adopted for static pictures in different initial states, and residual images and color cast are easy to generate.
Optionally, in the embodiment of the present invention, according to the expression formula of the stable Gain value after the attenuation is completed, the attenuation rate of the Gain value of the still picture is:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein, Gain0Is the initial Gain value, tmaxFor presetting decay time, GainminIs the minimum value of Gain of the static picture, q is the preset attenuation ratio, GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
In the embodiment of the invention, based on the gray scale range of 0-255 of each pixel in the common picture, for example, the preset attenuation time t can be setmaxThe Gain value decay rate can be obtained knowing the initial Gain value, the stable Gain value and the decay time for 256 seconds(s). In the brightness attenuation process, attenuation processing is performed with V _ gain, and when the attenuation time reaches 256s, the attenuation is ended.
Optionally, the method provided in the embodiment of the present invention may further include:
and adjusting the attenuation ratio according to the stable brightness value of the static picture after the attenuation is finished.
In the embodiment of the present invention, the attenuation ratio q may be preset to be a fixed value of 0.5, for example, and if the attenuation ratio is too large or the finally obtained stable luminance value is too low, the attenuation ratio q may be adjusted to obtain a stable luminance value with higher adaptability.
Optionally, fig. 2 is a flowchart of another luminance processing method according to an embodiment of the present invention. On the basis of the embodiment shown in fig. 1, after S120, the method provided in the embodiment of the present invention may further include:
s121, acquiring a current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate and the attenuated time;
and S122, obtaining the current brightness value of the static picture in the attenuation process according to the current Gain value.
In the embodiment of the invention, the current Gain value of the static picture in the attenuation process means that the current Gain value is in the attenuation processThe Gain value in the process (i.e. at a certain time point within the preset attenuation time), i.e. attenuation is started from the initial Gain value, the current Gain value is the intermediate quantity of the Gain value in the attenuation process, and accordingly, the current brightness value corresponding to the current Gain value can be obtained. The current Gain value in the embodiment of the invention is as follows: gaint＝Gain0-V_gain*t，GaintThe Gain value of the static picture at the decayed time t, and the current brightness value is: l ist＝L*Gaint＝L*(Gain0-V_gain*t)，LtRepresenting the luminance value of the still picture at the decayed time t.
In an embodiment of the present invention, an implementation manner of obtaining the stable luminance value after the static picture is attenuated may include:
when the decay time reaches the preset decay time, calculating a stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L is the brightness after RGB-RGBW;
and when the attenuation time does not reach the preset attenuation time, determining to continue the brightness attenuation processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
According to the calculation method of the stable brightness value, if the attenuation time reaches the preset attenuation time, the brightness attenuation is finished, and at this time, the stable brightness value, namely the L', can be calculated according to the initial Gain value, the Gain value attenuation rate and the preset attenuation time; if the decay time has not reached the preset decay time, the decay processing can be continued, and at this time, the current brightness value L can be usedtAnd judging whether the brightness of the current frame is the same as that of the previous frame, when the brightness is the same, indicating that the display picture is still a static picture, performing brightness attenuation through V _ gain, and when the brightness is different, indicating that the display picture is changed, and taking the newly input brightness as a stable brightness value.
Optionally, fig. 3 is a flowchart of another luminance processing method according to an embodiment of the present invention. On the basis of the foregoing embodiment, before S110, the method provided in the embodiment of the present invention may further include:
s100, determining static judgment time of a display picture according to an initial APL value of the display picture;
s101, in the static judgment time, the static judgment is carried out according to the image brightness of each frame of the display image.
In the embodiment of the present invention, before performing the brightness reduction processing on the still picture, it is first determined whether the picture displayed by the display is the still picture, and the time for performing the still picture determination in the prior art is usually fixed, that is, all types of still pictures have the same still determination time. However, in the small window state of high gray scale, the brightness of the picture is very high, and the afterimage is easily generated in the state of maintaining high brightness for a long time, so that in the process of brightness attenuation, the static judgment time of the display picture can be shortened for the static picture with higher brightness, so as to avoid the afterimage phenomenon of the display screen. In practical application, the length of the static judgment time can be set according to 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 in the reality, for example, the brightness sum of the current frame of picture can be compared with the brightness sum of the previous frame of picture, after the cyclic comparison is performed for many times, when the static judgment time is reached, the brightness sum of each frame is equal, and the currently displayed picture is considered as the static picture. The embodiment shown in fig. 3 is illustrated on the basis of the flow shown in fig. 1 described above as an example.
In an implementation manner of the embodiment of the present invention, an implementation manner of determining the static state determination time of the display screen according to the initial APL value of the display screen may include:
when the initial APL value is [0, 0.05 ]]When T is-1000 APL0+60；
When the initial APL value is (0.05, 0.5)]When T is 111 APL0+4.45；
When the initial APL value is (0.5, 1)]When T is 100 APL0+110。
It should be noted that, in a 10% window, the APL value of a monochrome picture at 255 gray levels is 0.05; the APL value of a monochrome picture under 255 gray levels is 0.5 in a 100% window; according to the embodiment of the invention, aiming at the display pictures with different APL values, the static judgment time adopts sectional linear processing, so that the image retention effect of the static pictures of the small windows under high gray scale is reduced. Fig. 4 is a graph showing a relationship between an APL value and a static determination time in the brightness processing method according to the embodiment of the present invention.
The embodiment of the invention limits the time for carrying out static judgment by the initial APL value of the display picture, is beneficial to shortening the whole time for carrying out brightness attenuation on the static picture, and can effectively avoid the phenomena of aging of a displayed TFT and generation of afterimages caused by long-time display of a high-brightness picture on a display screen.
Fig. 5 is a flowchart of another luminance processing method according to an embodiment of the present invention, fig. 5 illustrates a flowchart of the luminance processing method according to an embodiment of the present invention by way of example, where the flowchart shown in fig. 5 may include the following steps:
s201, acquiring the brightness Sum of the previous frame in the display picture, which is expressed as Sumt-1；
S202, acquiring the brightness Sum of the current frame in the display picture, and expressing the Sum as Sumt；
Wherein, the Sum of the brightness of each frame is Sum; with SumtDenotes the Sum of the luminance of the current frame, Sumt-1The calculation method of Sum of luminance of the previous frame is the same as that in the above embodiment, and therefore, the description thereof is omitted.
S203, the current frame of the display picture is sequentially advanced to the previous frame, namely Nt-1＝NtAfter obtaining SumtIn the process of (1), the current frame NtThe current frame N can be continuously acquired as the previous frame is changed in sequence, namely as the time advancestSum of luminance of, Sumt。
S204, judging whether the brightness Sum of the current frame is constantly equal to the brightness Sum of the previous frame, namely judging Sumt＝＝Sumt-1Is there a When Sum is presenttNot equal to Sumt-1In case (3), S205 is executed; when it is constant, S207 is executed.
That is, in the judgment time, the current display picture is the static picture only if the brightness sum of the current frame is always equal to the brightness sum of the previous frame; if the sum of the brightness of the current frame is not equal to the sum of the brightness of the previous frame at a certain moment, the display picture is changed, and the display picture is judged to be not a static picture.
S205, the Sum of the brightness of the current frame is equal to the Sum of the brightness of the next frame, i.e. Sumt-1＝Sumt；
S206, the current frame is set as the previous frame of the display screen, and then the process returns to S202.
In this embodiment, Sum in S205t-1＝SumtThat is, at a certain time in S204, it is determined that the identity is not established, and Sumt-1＝SumtAnd then, judging whether the display picture is a static picture or not by taking the current frame as a previous frame.
S207, determining whether the current judged frame number is equal to the frame number to be judged;
namely, judge Nt＝60*T(APL0) Is there a If the determination is yes, S208 is executed, and if the determination is no, the process returns to S201, i.e., it is continued to determine whether or not the display screen is a still screen based on the number of frames.
Wherein, T (APL)0) Is APL0Judgment time of lower still picture, 60 denotes 1s judgment of 60 frames, and right of equation denotes APL0Number of frames to be judged down, NtIndicating the number of frames currently judged. The initial APL value (APL) of the picture is used as a reference0) The manner of determining the determination time of the static image has been described in detail in the above embodiments, and therefore is not described herein again.
S208, after completing the above-mentioned determinations from S201 to S207, it is known that the current display screen is a static screen, and at this time, the APL according to the static screen0Obtaining corresponding Gain0；
S209, calculating the Gain value attenuation rate of the static picture, and performing brightness attenuation on the static picture through the Gain value attenuation rate;
s210, in the process of brightness attenuation, calculating the current Gain value of the static picture, wherein the current Gain value is as follows: gaint＝Gain0-V_gain*t。
S211, calculating the current brightness value of the static picture according to the current Gain value, wherein the current brightness value is as follows: l ist＝L*Gaint＝L*(Gain0-V_gain*t)；
S212, judging whether the decayed time reaches the preset decayed time, namely judging that t is more than or equal to tmaxIs there a (ii) a Preset decay time of tmaxWhen t is more than or equal to tmaxThen, S213 is executed, when t<tmaxThen, S214 is executed.
S213, calculating a stable luminance value after the luminance attenuation of the static image is completed, where the stable luminance value is: l ═ L (Gain)0-V_gain*tmax)；
S214, continuously judging whether the brightness Sum of the current frame is constantly equal to the brightness Sum of the previous frame, namely continuously judging Sumt＝＝Sumt-1Is there a When Sum is presenttNot equal to Sumt-1In case (3), S215 is executed; when the value is constant, the execution returns to S209;
s215, the newly input luminance is set as a stable luminance value.
That is to say, within the preset attenuation time, as long as the brightness sum of the current frame is always equal to the brightness sum of the previous frame, which indicates that the current display picture is still a static picture, the brightness attenuation is returned to continue to be performed on the static picture; if the sum of the brightness of the current frame is not equal to the sum of the brightness of the previous frame at a certain moment, which indicates that the display picture is changed, namely, the display picture is judged not to be a static picture, the newly input brightness is taken as a stable brightness value at the moment.
According to the brightness processing method provided by the embodiment of the invention, after the current displayed picture of the display is judged to be the static picture, the brightness of the current displayed static picture is attenuated according to the relational expression of the attenuated stable Gain value and the initial Gain value, namely the Gain attenuation rate is used as the basis of brightness attenuation, and the stable brightness value of the static picture is finally obtained, so that the problem that in the prior art, for the static pictures with different colors, the final stable brightness is inconsistent and color cast is generated due to different brightness attenuation ratios along with the change of the APL value of the static picture is solved. As shown in fig. 6, which is an effect diagram of luminance attenuation performed by the luminance processing method according to the embodiment of the present invention, fig. 6 shows a relationship between an APL value and a luminance reduction ratio of each sub-pixel in the RGBW of the static picture, and it can be seen that, along with a change in the APL value, the attenuation ratio trends of the RGBW are the same, and the attenuation ratio values are relatively close to each other, so that the color shift problem in the prior art is avoided to a great extent.
Based on the brightness processing method provided in the foregoing embodiments of the present invention, an embodiment of the present invention further provides a brightness processing apparatus, where the brightness processing apparatus is configured to execute the brightness processing method provided in any of the foregoing embodiments of the present invention.
Fig. 7 is a schematic structural diagram of a luminance processing apparatus according to an embodiment of the present invention. The brightness processing apparatus 30 provided in the present embodiment may include: an acquisition module 31, a rate calculation module 32, a brightness decay module 33, and a brightness acquisition module 34.
The obtaining module 31 is configured to obtain an initial Gain value of the still picture according to the initial picture average brightness APL value of the still picture.
The brightness processing device provided by the embodiment of the invention is used for performing brightness attenuation processing on a static picture displayed by a display. That is to say, the application scenarios of the embodiment of the present invention are as follows: when the current picture displayed by the display is a static picture, the brightness attenuation treatment is carried out on the static picture, if the display screen of the display displays a high-brightness static picture for a long time, the TFT is easy to age, and afterimages are generated, so that the display effect of the display is influenced.
In the embodiment of the present invention, it may be determined whether the currently displayed picture is a static picture by determining sub-pixels in several frames before and after the display process, and after determining that the currently displayed picture is the static picture, knowing an initial APL value of the static picture, the obtaining module 31 may obtain an initial Gain value of the static picture according to the initial APL value. The implementation manner of the obtaining module 31 in the embodiment of the present invention to obtain the initial Gain value has been described in detail in the above embodiments, and therefore, is not described herein again. The initial Gain value is the Gain value before brightness attenuation.
The rate calculation module 32 is configured to obtain a Gain value attenuation rate according to the initial Gain value of the static picture, the stable Gain value after the static picture finishes attenuation, and a preset attenuation time;
a brightness attenuation module 33, configured to perform brightness attenuation processing on the still picture according to the Gain value attenuation rate;
and a brightness obtaining module 34, configured to obtain a stable brightness value after the static image is attenuated.
In the embodiment of the present invention, the luminance attenuation of the still picture may be implemented by attenuating the Gain value, for example, a stable Gain value after the still picture is attenuated may be set, the stable Gain value may be defined by a relational expression, and in addition, the attenuation time is preset (the attenuation time in the embodiment of the present invention is set to 256 seconds, for example), so the rate calculation module 32 may calculate the attenuation rate of the Gain value of the still picture in the attenuation process, where the attenuation rate of the Gain value is a standard for attenuating the still picture. Subsequently, the brightness attenuation module 33 may perform brightness attenuation processing on the static picture at the determined Gain value attenuation rate, that is, within the preset attenuation time, the brightness is attenuated at the rate determined per second until the preset attenuation time is reached, and the attenuation is completed, at this time, the brightness obtaining module 34 may obtain the stable brightness value of the static picture after the attenuation is completed, that is, the final effect of performing the brightness attenuation according to the embodiment of the present invention.
In the brightness attenuation mode in the prior art, only the brightness of a static picture is taken as an initial condition of attenuation, and a mode of multiplying a proportionality coefficient smaller than 1 to attenuate the brightness of each sub-pixel of the static picture is adopted, because the same attenuation proportion and the same attenuation time are adopted for processing, the final stable brightness is too low to influence the viewing effect under the condition of low brightness of the initial picture, and the final stable brightness is too high to easily generate afterimages under the condition of high brightness of the initial picture; in addition, for static pictures with different colors, when the APL value of the picture changes, the final stable brightness is inconsistent after brightness attenuation is performed by adopting different attenuation ratios, so that color cast can be generated.
In contrast, in the embodiment of the present invention, a corresponding initial Gain value is obtained according to the initial APL value of the static picture, the stable Gain value after the attenuation is completed is set, the attenuation processing is performed on the static picture according to the calculated Gain value attenuation rate, and the stable luminance Gain after the attenuation is taken as the final result of the luminance attenuation, so as to obtain the stable luminance value after the static picture is completely attenuated. In the process, the manner of obtaining the initial Gain value is based on the corresponding manner of the APL value and the Gain value in the HDR algorithm, and the initial Gain values corresponding to the initial APL values are different for pictures with different colors and initial effects, so that the luminance processing apparatus provided in the embodiment of the present invention performs luminance attenuation by using the Gain value attenuation rate matched with the processing procedure for different types of static pictures (for example, static pictures with different colors and initial effects), can perform luminance attenuation in a manner more suitable for the current static picture, and obtains a stable luminance value with higher adaptability after the attenuation is completed.
In the brightness processing apparatus provided in the embodiment of the present invention, the obtaining module obtains an initial Gain value of the static picture according to an initial APL value of the static picture, and the rate calculating module calculates a Gain value attenuation rate according to the initial Gain value, the Gain value after the static picture finishes attenuation, and a preset attenuation time, so that the brightness attenuation module performs brightness attenuation processing on the static picture by using the Gain value attenuation rate, and the brightness obtaining module obtains a proper stable brightness value after the attenuation is finished; in the brightness processing device provided by the embodiment of the invention, for different types of static pictures (for example, static pictures with different colors and initial effects), the Gain value attenuation rate matched with the static pictures is adopted in the processing process to perform brightness attenuation, so that a stable brightness value with high adaptability is obtained after the attenuation is completed, and in addition, for the static pictures with different colors, the brightness attenuation is performed based on the Gain value attenuation rate calculated by the initial APL value, so that the phenomenon of color cast after the attenuation is avoided; the method solves the problems that the brightness attenuation mode in the prior art is poor in adaptability of stable brightness obtained after attenuation due to the fact that the brightness attenuation mode in a single form is adopted for static pictures in different initial states, and residual images and color cast are easy to generate.
Optionally, in the embodiment of the present invention, the Gain value decay rate calculated by the rate calculation module 32 is:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein, Gain0Is the initial Gain value, tmaxFor presetting decay time, GainminIs the minimum value of Gain of the static picture, q is the preset attenuation ratio, GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
In the embodiment of the invention, based on the gray scale range of 0-255 of each pixel in the common picture, for example, the preset attenuation time t can be setmaxKnowing the initial Gain value, the steady Gain value and the decay time for 256s, the Gain value decay rate can be obtained. In the brightness attenuation process, attenuation processing is performed with V _ gain, and when the attenuation time reaches 256s, the attenuation is ended.
Optionally, fig. 8 is a schematic structural diagram of another luminance processing apparatus provided in the embodiment of the present invention, and based on the structure of the apparatus shown in fig. 7, the luminance processing apparatus provided in the embodiment of the present invention may further include:
and the adjusting module 35 is configured to adjust the attenuation ratio according to the stable brightness value after the static picture is attenuated.
In the embodiment of the present invention, the attenuation ratio q in the initial calculation of the rate calculation module 32 may be preset to be a fixed value of 0.5, for example, and if the attenuation ratio is too large or the finally obtained stable luminance value is too low, the attenuation ratio q may be adjusted to obtain a stable luminance value with higher adaptability.
Optionally, the brightness processing apparatus provided in the embodiment of the present invention may further include:
the intermediate value calculating module 36 is configured to obtain a current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate, and the attenuated time;
the intermediate value calculating module 36 is further configured to obtain a current luminance value of the still picture in the fading process according to the current Gain value.
In the embodiment of the present invention, the current Gain value of the static picture in the attenuation process refers to a Gain value in the attenuation process (i.e., at a certain time point within the preset attenuation time), that is, attenuation is started from the initial Gain value, and the current Gain value is an intermediate amount of the Gain value in the attenuation process, and accordingly, a current luminance value corresponding to the current Gain value can be obtained. The current Gain value in the embodiment of the invention is as follows: gaint＝Gain0-V_gain*t，GaintThe Gain value of the static picture at the decayed time t, and the current brightness value is: l ist＝L*Gaint＝L*(Gain0-V_gain*t)，LtRepresenting the luminance value of the still picture at the decayed time t.
In this embodiment of the present invention, an implementation manner of the luminance obtaining module 34 obtaining the stable luminance value after the static image is attenuated may include:
when the decay time reaches the preset decay time, calculating a stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L is the brightness after RGB-RGBW;
and when the attenuation time does not reach the preset attenuation time, determining to continue the brightness attenuation processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
According to the calculation method of the stable brightness value, if the attenuation time reaches the preset attenuation time, the brightness attenuation is finished, and at this time, the stable brightness value, namely the L', can be calculated according to the initial Gain value, the Gain value attenuation rate and the preset attenuation time; if the decay time has not reached the preset decay time, the decay processing can be continued, and at this time, the current brightness value L can be usedtJudging whether the brightness of the current frame is the same as that of the previous frame, when the brightness is the same, indicating that the display picture is still a static picture, carrying out brightness attenuation through V _ gain, when the brightness is different, indicating that the display picture is changed, and taking the newly input brightness as stableA brightness value.
Optionally, fig. 9 is a schematic structural diagram of another luminance processing apparatus according to an embodiment of the present invention, and on the basis of the foregoing embodiment, the luminance processing apparatus according to the embodiment of the present invention may further include:
a time determining module 37, configured to determine a static determination time of the display frame according to the initial frame average brightness APL value of the display frame;
the static state determination module 38 is configured to perform a static state determination according to the frame brightness of each frame of the display frame within the static state determination time. The embodiment shown in fig. 9 is illustrated 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 the brightness attenuation processing on the still picture, it is first to determine whether the picture displayed by the display is the still picture, and in the prior art, the time for performing the still picture determination is usually fixed, that is, all types of still pictures have the same still determination time. However, in the small window state of high gray scale, the brightness of the picture is very high, and the afterimage is easily generated in the state of maintaining high brightness for a long time, so that in the process of brightness attenuation, the static judgment time of the display picture can be shortened for the static picture with higher brightness, so as to avoid the afterimage phenomenon of the display screen. In practical application, the length of the static judgment time can be set according to 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 in the reality, for example, the brightness sum of the current frame of picture can be compared with the brightness sum of the previous frame of picture, after the cyclic comparison is performed for many times, when the static judgment time is reached, the brightness sum of each frame is equal, and the currently displayed picture is considered as the static picture.
It should be noted that, in the embodiment of the present invention, the manner in which the time determining module 37 determines the static determination time of the display frame, that is, the manner in which the static determination time is determined by the initial APL value, and the beneficial effects achieved by the method are the same as those in the above embodiment, and therefore, no further description is given 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 the embodiment of the present invention may include: a memory 41 and a processor 42.
Wherein, the memory 41 is used for storing executable instructions;
and a processor 42, configured to implement the brightness processing method provided in any of the above embodiments of the present invention when executing the executable instructions stored in the memory 41.
The implementation of the computer device 40 provided in the embodiment of the present invention is substantially the same as the brightness processing method provided in the above embodiment of the present invention, and details thereof are not repeated herein.
Embodiments of the present invention further provide a computer-readable storage medium, where the computer-readable storage medium stores executable instructions, and when the executable instructions are executed by a processor, the computer-readable storage medium can implement the brightness processing method provided in any of the above embodiments of the present invention. The implementation of the computer-readable storage medium provided in the embodiment of the present invention is substantially the same as the brightness processing method provided in the above-mentioned embodiment of the present invention, and details thereof are not repeated herein.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A luminance processing method characterized by comprising:
acquiring an initial brightness Gain value of the static picture according to the initial picture average brightness APL value of the static picture;
obtaining a Gain value attenuation rate according to the initial Gain value of the static picture, the stable Gain value of the static picture after the static picture finishes attenuation and preset attenuation time;
and performing brightness attenuation processing on the static picture through the Gain value attenuation rate, and acquiring a stable brightness value of the static picture after the static picture is attenuated.
2. The luminance processing method as claimed in claim 1, wherein the Gain value decay rate of the still picture is:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein the Gain0Is the initial Gain value, the tmaxFor a preset decay time, the GainminThe minimum value of Gain of the static picture is q is a preset attenuation proportion, and the GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
3. The luminance processing method according to claim 2, further comprising:
and adjusting the attenuation ratio according to the stable brightness value of the static picture after the attenuation is finished.
4. The luminance processing method according to claim 2, wherein after the obtaining the Gain value decay rate of the still picture, the method further comprises:
acquiring the current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate and the attenuated time;
obtaining the current brightness value of the static picture in the attenuation process according to the current Gain value;
the obtaining of the stable brightness value after the static picture is attenuated includes:
when the decay time reaches the preset decay time, calculating the stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L represents the luminance of the RGB sub-pixel after adding the white sub-pixel (RGB-RGBW);
and when the decayed time does not reach the preset decayed time, determining to continue the brightness decay processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
5. The luminance processing method according to claim 1, further comprising:
determining static judgment time of the display picture according to the APL value of the initial picture average brightness of the display picture;
and in the static judgment time, performing static judgment according to the image brightness of each frame of the display image.
6. The method according to claim 5, wherein the determining the static determination time of the display according to the initial APL value of the display comprises:
when the initial APL value is 0 to 0.05, the static judgment time is:
T＝-1000*APL0+60；
when the initial APL value is 0.05 to 0.5, the static judgment time is as follows:
T＝111*APL0+4.45；
when the initial APL value is 0.5 to 1, the static judgment time is:
T＝100*APL0+110；
wherein, T is the static judgment time, APL0Is the initial APL value.
7. A luminance processing apparatus characterized by comprising:
the acquisition module is used for acquiring an initial brightness Gain value of the static picture according to the initial picture average brightness APL value of the static picture;
the rate calculation module is used for acquiring the attenuation rate of the Gain value according to the initial Gain value of the static picture, the stable Gain value of the static picture after the attenuation is finished and the preset attenuation time;
the brightness attenuation module is used for carrying out brightness attenuation processing on the static picture through the Gain value attenuation rate;
and the brightness acquisition module is used for acquiring the stable brightness value of the static picture after the static picture is attenuated.
8. The luminance processing apparatus according to claim 7, wherein the rate calculation module calculates the Gain value decay rate as:
V_gain＝(Gain0-Gainmin*(1-q))/tmax；
wherein the Gain0Is the initial Gain value, the tmaxFor a preset decay time, the GainminThe minimum value of Gain of the static picture is q is a preset attenuation proportion, and the GainminAnd (1-q) is the stable Gain value after the attenuation is completed.
9. The luminance processing device according to claim 8, further comprising:
and the adjusting module is used for adjusting the attenuation ratio according to the stable brightness value of the static picture after the attenuation is finished.
10. The luminance processing device according to claim 8, further comprising:
the intermediate value calculating module is used for acquiring the current Gain value of the static picture in the attenuation process according to the initial Gain value, the Gain value attenuation rate and the attenuated time;
the intermediate value calculating module is further used for obtaining a current brightness value of the static picture in the attenuation process according to the current Gain value;
the acquiring module of the luminance obtains the stable luminance value after the static picture finishes attenuating, including:
when the decay time reaches the preset decay time, calculating the stable brightness value as:
L'＝L*(Gain0-V_gain*tmax) (ii) a Wherein L represents the luminance of the RGB sub-pixel after adding the white sub-pixel (RGB-RGBW);
and when the decayed time does not reach the preset decayed time, determining to continue the brightness decay processing or taking the newly input brightness as a stable brightness value according to the current brightness value.
11. The luminance processing device according to claim 7, further comprising:
the time determining module is used for determining the static judging time of the display picture according to the APL value of the average brightness of the initial picture of the display picture;
and the static judgment module is used for carrying out static judgment according to the image brightness of each frame of the display image within the static judgment time.
12. A computer device, comprising: a memory and a processor;
the memory is used for storing executable instructions;
the processor is used for realizing the brightness processing method according to any one of claims 1-6 when executing the executable instructions saved by the memory.
13. A computer-readable storage medium storing executable instructions that, when executed by a processor, implement a luminance processing method as claimed in any one of claims 1 to 6.
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