CN109102779B - Backlight adjusting method and device - Google Patents

Backlight adjusting method and device Download PDF

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CN109102779B
CN109102779B CN201810967842.2A CN201810967842A CN109102779B CN 109102779 B CN109102779 B CN 109102779B CN 201810967842 A CN201810967842 A CN 201810967842A CN 109102779 B CN109102779 B CN 109102779B
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picture
displayed
brightness
backlight
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CN109102779A (en
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陈虹燕
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Beijing Xiaomi Mobile Software Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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Abstract

The method comprises the steps of obtaining brightness information of a picture to be displayed, counting the number of pixels of the picture to be displayed in each preset brightness area according to the brightness information, determining the average value of the brightness coefficient of the picture to be displayed according to the number of the pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficient corresponding to each preset brightness area, and determining the backlight value corresponding to the picture to be displayed according to the average value of the brightness coefficient of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the average value of the brightness coefficient and the backlight value.

Description

Backlight adjusting method and device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a backlight adjusting method and apparatus.
Background
Most display screens of display devices such as televisions, computers and the like are transmissive liquid crystal screens, the brightness of the transmissive liquid crystal screens is determined by the light transmittances of the backlight system and the liquid crystal panels, but the light transmittances of the liquid crystal panels are low, generally 6% -8%, and are relatively stable, so that the brightness adjustment of the transmissive liquid crystal screens is mainly controlled and adjusted by the backlight system.
In the actual use process of a user, the brighter the backlight of the display screen is, the brighter and brighter the display effect of the picture is, but if the backlight is always in the brightest state, the viewing time is long, the eye fatigue is easily caused, and meanwhile, the power consumption is always in a higher state, which is not environment-friendly enough, so that the brightness of the backlight needs to be dynamically adjusted according to the display picture.
Disclosure of Invention
The embodiment of the disclosure provides a backlight adjusting method and device. The technical scheme is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided a backlight adjusting method, including:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
and determining a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value.
In an embodiment, the determining an average value of the luminance coefficients of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset luminance area and a pre-stored luminance coefficient corresponding to each preset luminance area includes:
calculating the average value L of the brightness coefficient of the picture to be displayed according to the following formulacal：
Figure BDA0001775416060000021
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
In an embodiment, the determining the backlight value corresponding to the to-be-displayed picture according to the average value of the luminance coefficients of the to-be-displayed picture and a preset backlight value curve includes:
calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
In an embodiment, the determining the backlight value corresponding to the to-be-displayed picture according to the average value of the luminance coefficients of the to-be-displayed picture and a preset backlight value curve includes:
determining a preprocessing backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve;
acquiring a backlight adjustment proportion;
and determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
In one embodiment, the method further comprises:
and when the picture to be displayed is displayed, gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length.
According to a second aspect of the embodiments of the present disclosure, there is provided a backlight adjusting apparatus including:
the first acquisition module is used for acquiring the brightness information of a picture to be displayed;
the statistical module is used for counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
the first determining module is used for determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
and the second determining module is used for determining the backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value.
In one embodiment, the first determining module comprises:
a first calculation submodule for calculating an average value L of the luminance coefficients of the picture to be displayed according to the following formulacal：
Figure BDA0001775416060000031
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
In one embodiment, the second determining module comprises:
a second calculating submodule for calculating a backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
In one embodiment, the second determining module comprises:
the first determining submodule is used for determining a preprocessing backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve;
the obtaining submodule is used for obtaining a backlight adjusting proportion;
and the second determining submodule is used for determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
In one embodiment, the apparatus further comprises:
and the adjusting module is used for gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length when the picture to be displayed is displayed.
According to a third aspect of the embodiments of the present disclosure, there is provided a backlight adjusting apparatus including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
and determining a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium storing computer instructions which, when executed by a processor, implement the steps in the above-mentioned method.
The technical scheme provided by the embodiment of the disclosure can have the advantages that the embodiment can obtain brightness information of a Picture to be displayed, count the number of pixels of the Picture to be displayed in each preset brightness area according to the brightness information, determine a brightness coefficient Average value of the Picture to be displayed according to the number of pixels of the Picture to be displayed in each preset brightness area and a pre-stored brightness coefficient corresponding to each preset brightness area, determine a backlight value corresponding to the Picture to be displayed according to the brightness coefficient Average value of the Picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient Average value and the backlight value, and thus a preset brightness coefficient is correspondingly set for each preset brightness area, so that different brightness coefficient Average values can be obtained under pictures with different brightness distributions under the same AP L (Average brightness L el, and different backlight values corresponding to different brightness coefficient Average values can be obtained, and thus different backlight values of pictures with different brightness distributions under the same AP L can be set, and backlight control of pictures can be more flexible.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a flow chart illustrating a backlight adjusting method according to an exemplary embodiment.
Fig. 2 is a luminance coefficient histogram shown according to an exemplary embodiment.
FIG. 3 is a graphical illustration of a backlight value curve according to an exemplary embodiment.
Fig. 4 is a flow chart illustrating a backlight adjustment method according to an exemplary embodiment.
Fig. 5 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Fig. 6 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Fig. 7 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Fig. 8 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Fig. 9 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Fig. 10 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
At present, the adjustment of the backlight brightness is mostly based on the Average brightness AP L (Average Picture L evel) of the display screen, for example, as the AP L changes from 0% to 100%, the backlight changes from 1 to 100 linearly, that is, when the AP L is 0%, the backlight value is 1, when the AP L is 50%, the backlight value is 50, and when the AP L is 100%, the backlight value is 100.
In order to solve the above problems, the present embodiment may obtain luminance information of a to-be-displayed picture, count the number of pixels of the to-be-displayed picture in each preset luminance region according to the luminance information, determine a luminance coefficient average value of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset luminance region and a preset luminance coefficient corresponding to each preset luminance region, and determine a backlight value corresponding to the to-be-displayed picture according to the luminance coefficient average value of the to-be-displayed picture and a preset backlight value curve, where the backlight value curve includes a corresponding curve between the luminance coefficient average value and the backlight value, so that a preset luminance coefficient is correspondingly set for each preset luminance region, so that different luminance coefficient average values can be obtained under pictures with different luminance distributions and the same AP L (average picture luminance L even, picture average luminance), and further different backlight values corresponding to different luminance coefficient average values can be obtained, so that different pictures with different luminance distributions and the same AP L can be set, and backlight control of the pictures with more flexible and accurate results.
Fig. 1 is a flowchart illustrating a backlight adjusting method according to an exemplary embodiment, where the backlight adjusting method is used in a terminal, as shown in fig. 1, and includes the following steps 101 and 104:
in step 101, luminance information of a picture to be displayed is acquired.
In step 102, the number of pixels of the to-be-displayed picture in each preset brightness area is counted according to the brightness information.
In step 103, determining an average value of the brightness coefficients of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset brightness region and the pre-stored brightness coefficients corresponding to each preset brightness region.
In step 104, a backlight value corresponding to the picture to be displayed is determined according to the average value of the luminance coefficients of the picture to be displayed and a preset backlight value curve, where the backlight value curve includes a corresponding curve between the average value of the luminance coefficients and the backlight value.
Here, when a terminal, such as a television, plays a video or a picture or displays a picture on a UI (User Interface), the terminal may first acquire picture information of the picture to be displayed, and then perform some display processing, where the display processing includes determining a backlight value corresponding to the picture to be displayed according to the picture information of the picture to be displayed, so that the terminal may use the backlight value corresponding to the picture to be displayed when displaying the picture to be displayed.
The image information of the image to be displayed acquired by the terminal includes brightness information of the image to be displayed, the brightness information includes brightness values of pixels in the image to be displayed, the value range of the pixel brightness values is 0-255, the total black is 0, and the total white is 255.
Here, the terminal may divide N luminance regions as preset luminance regions in advance according to a luminance value range of 0 to 255, for example, the luminance regions may be divided into N luminance regions equally, and then the terminal may statistically acquire the number of pixels of the to-be-displayed picture in each preset luminance region.
Here, the terminal may set a luminance coefficient for each preset luminance region in advance and prestore the luminance coefficient as 0 if the corresponding luminance coefficient when the luminance value of the preset luminance region is a middle range value, and the luminance coefficient of the preset luminance region is larger for a larger luminance value and larger for a smaller luminance value than the middle range value. For example, fig. 2 is a luminance coefficient histogram according to an exemplary embodiment, where the horizontal axis is a luminance value and the vertical axis is a luminance coefficient, and as shown in fig. 2, the terminal may divide a luminance value range according to 0 to 255 into 64 preset luminance regions, and the luminance coefficients corresponding to the 64 preset luminance regions may be (5, 3, 1, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10).
Here, the terminal may multiply the number of pixels in each preset luminance area by the luminance coefficient corresponding to each preset luminance area, and then obtain an average value of the luminance coefficients of the to-be-displayed picture, and then obtain the backlight value corresponding to the to-be-displayed picture according to a correspondence between the average value of the luminance coefficients and the backlight value in a preset backlight value curve. The backlight value curve can be a backlight value curve which is obtained by a developer through a large amount of experiments and continuous adjustment after preset brightness coefficients corresponding to all the preset areas are set, and is suitable for display effects required by most users, and backlight value curves obtained by different display effects are different.
Here, after the terminal determines the backlight value corresponding to the to-be-displayed picture, the backlight value of the terminal may be adjusted to the backlight value corresponding to the to-be-displayed picture when the to-be-displayed picture is displayed.
The method can obtain brightness information of a picture to be displayed, count the number of pixels of the picture to be displayed in each preset brightness area according to the brightness information, determine a brightness coefficient average value of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and a preset brightness coefficient corresponding to each preset brightness area, and determine a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value, so that a preset brightness coefficient is correspondingly set for each preset brightness area, different brightness coefficient average values can be obtained under pictures with the same AP L and different backlight values corresponding to the different brightness coefficient average values can be obtained, different backlight values can be set for pictures with the same AP L and backlight control of the pictures is more flexible and accurate.
In a possible implementation manner, step 103 in the backlight adjusting method can be implemented as the following step a 1.
In step A1, the brightness of the picture to be displayed is calculated according to the following formulaCoefficient average Lcal：
Figure BDA0001775416060000081
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
Here, still according to the example shown in fig. 2, N is 64, and the brightness coefficients k for 64 preset regions correspond to each otheriAs shown in fig. 2, both screen 1 and screen 2 are 20% AP L, screen 1 is a black white window of 1920 × 1080, and the white window accounts for 20%, and screen 2 is a gray scale of 1920 × 1080 with a brightness value of 51.
The average value L of the brightness coefficient of the picture 1 can be calculated according to the formulacal1：
Figure BDA0001775416060000082
The average value L of the brightness coefficient of the picture 2 can be calculated according to the formulacal2：
Figure BDA0001775416060000091
As can be seen from the above example, the average value of the luminance coefficient differs between the screen 1 and the screen 2 having the AP L of 20% due to the difference in the luminance distribution.
The embodiment can calculate the average value of the brightness coefficient according to the corresponding formula, so that different average values of the brightness coefficient can be obtained under the same AP L picture with different brightness distributions, and then different backlight values corresponding to the different average values of the brightness coefficient can be obtained, so that different backlight values can be set for the same AP L picture with different brightness distributions, and the backlight control of the picture is more flexible and accurate.
In a possible implementation manner, the step 104 in the backlight adjusting method can be implemented as the following step B1.
In step B1, calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal-j) equation 2
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
Here, the developer may determine the average value of the luminance coefficients corresponding to a large number of sample pictures according to the preset luminance coefficients corresponding to each preset luminance area, where the average value of the luminance coefficients ranges from 0 to k, and k is kiThe value range of k is 0 to 255, the value range can be divided into k +1 points, each point corresponds to a backlight value, the backlight value corresponding to the sample picture is determined according to the formula 2, each point is continuously adjusted to correspond to a backlight value according to the finally determined backlight value until the display effect of the sample pictures meets the requirements of developers, and the final backlight value B L corresponding to each point can be determinedjThen, the terminal can calculate the backlight value B L corresponding to the picture to be displayed according to formula 2cal。
Here, fig. 3 is a diagram illustrating a backlight value curve according to an exemplary embodiment, where the horizontal axis is a luminance coefficient and the vertical axis is a backlight value, and still referring to fig. 2, a developer may determine a luminance coefficient average value corresponding to a large number of sample pictures according to the preset luminance coefficients corresponding to each preset luminance area shown in fig. 2, where the luminance coefficient average value L is the average value of the luminance coefficientscalThe value range of (1) is 0 to 10, the value range can be divided into 11 points of 0, 1, … …, 9 and 10, each point corresponds to a backlight value B LjDetermining the backlight value corresponding to the sample picture according to the formula 2, continuously adjusting each point to correspond to one backlight value according to the finally determined backlight value until the display effect of the sample pictures meets the requirement of developers, and determining the final backlight value B L corresponding to each point respectivelyjThe value of the average of the values for (30, 42, 58, 76, 100, 132, 178, 200,208, 216, 220), the terminal can obtain the backlight value curve shown in fig. 3 according to equation 2, and still take picture 1 and picture 2 as an example for illustration, according to equation 2 and the backlight value curve shown in fig. 3, the backlight value corresponding to picture 1 is B Lcal1＝178+(200-178)×(6-[6]) 178, picture 2 corresponds to a backlight value of B Lcal2＝42+(58-42)×(1-[1])＝42。
As can be seen from the above example, for the two different pictures, i.e., picture 1 and picture 2, of the same AP L, the high luminance ratio contained in picture 1 is much greater than that of picture 2, and the backlight value of picture 1 calculated according to the above equations 1 and 2 is much greater than that of picture 2, so that a stronger contrast is obtained and the user viewing experience is better.
The backlight value corresponding to the picture to be displayed can be determined according to the formula 2, and the determination mode is quick and convenient.
In a possible implementation manner, the step 104 in the backlight adjusting method may be implemented as the following steps C1 to C3.
In step C1, determining a pre-processing backlight value corresponding to the to-be-displayed picture according to the average luminance coefficient of the to-be-displayed picture and a preset backlight value curve.
In step C2, a backlight adjustment ratio is acquired.
In step C3, the backlight value corresponding to the to-be-displayed picture is determined according to the pre-processing backlight value corresponding to the to-be-displayed picture and a preset backlight adjustment ratio.
Here, different users have different backlight brightness requirements, and the terminal may set an input box of backlight adjustment ratio in the user interface, for example, the input box may Display the maximum backlight mapping value B L that can be set by OSD (On Screen Display)uimAs shown in 100, the user inputs the currently set OSD backlight mapping value B L in the input boxuiIf 90, the backlight adjustment ratio is p% ═ B Lui/BLuim。
Here, the terminal may calculate a final backlight value B L corresponding to the picture to be displayed according to the following formulaf：
BLf＝[BLcal×p％]Equation 3
Wherein, the B LcalThe backlight value corresponding to the picture to be displayed is the p% preset backlight adjustment ratio, and in practical application, the backlight value B LfIt is required to be an integer, so B L can be substitutedcal× p% rounded.
Here, after determining the preprocessed backlight value of each to-be-displayed picture, the terminal determines the final backlight value corresponding to the to-be-displayed picture according to the backlight adjustment ratio input by the user, so that the backlight brightness used when the terminal displays the picture meets the user requirement.
Still taking the above example as an example, the pre-processing backlight value corresponding to picture 1 can be calculated to be B Lcal1＝178+(200-178)×(6-[6]) 178, picture 2 corresponds to a pre-processing backlight value of B Lcal2＝42+(58-42)×(1-[1]) 42, assume B Luim＝100，BLuiWhen the backlight value is 90, the backlight value corresponding to the picture 1 is obtained
Figure BDA0001775416060000111
The backlight value corresponding to the picture 2 is
Figure BDA0001775416060000112
In this embodiment, the backlight adjustment ratio may be obtained, so that after the preprocessed backlight value corresponding to the to-be-displayed picture is determined according to the average brightness coefficient of the to-be-displayed picture and the preset backlight value curve, the backlight value corresponding to the to-be-displayed picture may be determined according to the preprocessed backlight value corresponding to the to-be-displayed picture and the backlight adjustment ratio, so that different backlight adjustment ratios may be set according to different user requirements to adjust the backlight, and different requirements of different users are met.
In a possible implementation, the backlight adjusting method may further include the following step D1.
In step D1, when the picture to be displayed is displayed, the backlight value of the previous frame of the display picture is gradually adjusted to the backlight value corresponding to the picture to be displayed according to a preset step length.
Here, when the terminal displays a certain frame of picture to be displayed, it needs to adjust the backlight value of the terminal from the backlight value corresponding to the previous frame of picture to be displayed to the backlight value corresponding to the picture to be displayed, but if the difference between the backlight value of the previous frame of picture, such as 200, and the backlight value of the current frame of picture, such as 50, is large, the terminal directly adjusts the backlight value from 200 to 50, and the picture will flicker due to backlight jump; therefore, in order to make the brightness change of the image smoother and smoother, a gradual change can be made between the backlight value of the previous frame of the display image, such as 200, and the backlight value of the current frame of the to-be-displayed image, such as 50, to gradually change by a preset step length, such as 3 or 5. For example, assuming that the preset step is 5, when the terminal needs to adjust the backlight value from 200 to 50, the backlight value can be gradually adjusted from 200 to 190 … … 60-55-50, and thus the brightness change of the picture is smooth and fluent, and the user's viewing effect is better.
According to the embodiment, when the to-be-displayed picture is displayed, the backlight value of the previous frame of display picture is gradually adjusted to the backlight value corresponding to the to-be-displayed picture according to the preset step length, so that the brightness change of the terminal display picture is smoother and smoother, and the watching effect of a user is better.
The implementation is described in detail below by way of several embodiments.
Fig. 4 is a flowchart illustrating a backlight adjusting method according to an exemplary embodiment, where as shown in fig. 4, the backlight adjusting method may be implemented by a terminal device such as a television, and includes steps 401 and 407.
In step 401, luminance information of a picture to be displayed is acquired.
In step 402, the number of pixels of the to-be-displayed picture in each preset brightness area is counted according to the brightness information.
In step 403, calculating the average value of the luminance coefficients of the to-be-displayed picture according to formula 1:
Figure BDA0001775416060000121
whereinN is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
In step 404, a pre-processing backlight value corresponding to the to-be-displayed picture is determined according to the average value of the brightness coefficients of the to-be-displayed picture and a preset backlight value curve.
In step 405, a backlight adjustment ratio is obtained.
In step 406, a backlight value corresponding to the to-be-displayed picture is determined according to the pre-processing backlight value corresponding to the to-be-displayed picture and the backlight adjustment ratio.
In step 407, when the picture to be displayed is displayed, the backlight value of the previous frame of the display picture is gradually adjusted to the backlight value corresponding to the picture to be displayed according to a preset step length.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods.
Fig. 5 is a block diagram illustrating a backlight adjusting apparatus, which may be implemented as part or all of an electronic device by software, hardware, or a combination of both, according to an exemplary embodiment. As shown in fig. 5, the backlight adjusting apparatus includes:
a first obtaining module 501, configured to obtain brightness information of a to-be-displayed picture;
a counting module 502, configured to count the number of pixels of the to-be-displayed picture in each preset luminance area according to the luminance information;
a first determining module 503, configured to determine an average value of luminance coefficients of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset luminance region and a pre-stored luminance coefficient corresponding to each preset luminance region;
a second determining module 504, configured to determine a backlight value corresponding to the to-be-displayed picture according to the average luminance coefficient of the to-be-displayed picture and a preset backlight value curve, where the backlight value curve includes a corresponding curve between the average luminance coefficient and the backlight value.
As a possible embodiment, fig. 6 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment, and as shown in fig. 6, the backlight adjusting apparatus disclosed above may further configure the first determining module 503 to include a first calculating sub-module 5031, wherein:
a first calculating sub-module 5031 for calculating the average value L of the brightness coefficient of the picture to be displayed according to the following formulacal：
Figure BDA0001775416060000131
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is a preset brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
As a possible embodiment, fig. 7 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment, and as shown in fig. 7, the backlight adjusting apparatus disclosed above may further configure the second determining module 504 to include a second calculating sub-module 5041, where:
a second calculating submodule 5041, configured to calculate a backlight value B L corresponding to the to-be-displayed picture according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
As a possible embodiment, fig. 8 is a block diagram illustrating a backlight adjusting apparatus according to an exemplary embodiment, and as shown in fig. 8, the backlight adjusting apparatus disclosed above may further configure the second determining module 504 to include a first determining sub-module 5042, an obtaining sub-module 5043 and a second determining sub-module 5044, wherein:
the first determining submodule 5042 is configured to determine a preprocessed backlight value corresponding to the to-be-displayed picture according to the average luminance coefficient of the to-be-displayed picture and a preset backlight value curve;
an obtaining sub-module 5043 for obtaining a backlight adjustment ratio;
and the second determining submodule 5044 is configured to determine the backlight value corresponding to the to-be-displayed picture according to the pre-processing backlight value corresponding to the to-be-displayed picture and the backlight adjustment ratio.
As a possible embodiment, fig. 9 is a block diagram of a backlight adjusting apparatus according to an exemplary embodiment, as shown in fig. 9, the backlight adjusting apparatus disclosed above may be further configured to include an adjusting module 505, where:
and an adjusting module 505, configured to gradually adjust the backlight value of the previous frame of the display image to the backlight value corresponding to the to-be-displayed image according to a preset step length when the to-be-displayed image is displayed.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 10 is a block diagram illustrating an apparatus for backlight adjustment, which is suitable for a terminal device, according to an exemplary embodiment. For example, the apparatus 1000 may be a mobile phone, a game console, a computer, a tablet device, a personal digital assistant, and the like.
The apparatus 1000 may include one or more of the following components: processing component 1001, memory 1002, power component 1003, multimedia component 1004, audio component 1005, input/output (I/O) interface 1006, sensor component 1007, and communications component 1008.
The processing component 1001 generally controls the overall operation of the device 1000, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 1001 may include one or more processors 1020 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 1001 may include one or more modules that facilitate interaction between the processing component 1001 and other components. For example, the processing component 1001 may include a multimedia module to facilitate interaction between the multimedia component 1004 and the processing component 1001.
The memory 1002 is configured to store various types of data to support operations at the device 1000. Examples of such data include instructions for any application or method operating on device 1000, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 1002 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
Power supply components 1003 provide power to the various components of device 1000. The power components 1003 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 1000.
The multimedia component 1004 includes a screen that provides an output interface between the device 1000 and a user, in some embodiments, the screen may include a liquid crystal display (L CD) and a Touch Panel (TP). if the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user.
The audio component 1005 is configured to output and/or input audio signals. For example, audio component 1005 includes a Microphone (MIC) configured to receive external audio signals when apparatus 1000 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 1002 or transmitted via the communication component 1008. In some embodiments, audio component 1005 also includes a speaker for outputting audio signals.
The I/O interface 1006 provides an interface between the processing component 1001 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 1007 includes one or more sensors for providing various aspects of status assessment for the device 1000. For example, the sensor assembly 1007 can detect the open/closed status of the device 1000, the relative positioning of the components, such as the display and keypad of the device 1000, the sensor assembly 1007 can also detect a change in the position of the device 1000 or a component of the device 1000, the presence or absence of user contact with the device 1000, the orientation or acceleration/deceleration of the device 1000, and a change in the temperature of the device 1000. The sensor assembly 1007 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 1007 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1007 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 1008 is configured to facilitate communications between the apparatus 1000 and other devices in a wired or wireless manner. The device 1000 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1008 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1008 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the apparatus 1000 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), programmable logic devices (P L D), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer readable storage medium comprising instructions, such as the memory 1002 comprising instructions, executable by the processor 1020 of the device 1000 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
A non-transitory computer readable storage medium, wherein instructions, when executed by a processor of a device 1000, enable the device 1000 to perform the above-described backlight adjustment method, the method comprising:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
and determining a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value.
In an embodiment, the determining an average value of the luminance coefficients of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset luminance area and a pre-stored luminance coefficient corresponding to each preset luminance area includes:
calculating the average value L of the brightness coefficient of the picture to be displayed according to the following formulacal：
Figure BDA0001775416060000171
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
In an embodiment, the determining the backlight value corresponding to the to-be-displayed picture according to the average value of the luminance coefficients of the to-be-displayed picture and a preset backlight value curve includes:
calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
In an embodiment, the determining the backlight value corresponding to the to-be-displayed picture according to the average value of the luminance coefficients of the to-be-displayed picture and a preset backlight value curve includes:
determining a preprocessing backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve;
acquiring a backlight adjustment proportion;
and determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
In one embodiment, the method further comprises:
and when the picture to be displayed is displayed, gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length.
The present embodiment further provides a backlight adjusting apparatus, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
and determining a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value.
In one embodiment, the processor may be further configured to:
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area, wherein the determining comprises the following steps:
calculating the average value L of the brightness coefficient of the picture to be displayed according to the following formulacal：
Figure BDA0001775416060000191
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
In one embodiment, the processor may be further configured to:
the determining the backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve comprises the following steps:
calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
In one embodiment, the processor may be further configured to:
the determining the backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve comprises the following steps:
determining a preprocessing backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve;
acquiring a backlight adjustment proportion;
and determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
In one embodiment, the processor may be further configured to:
the method further comprises the following steps:
and when the picture to be displayed is displayed, gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A backlight adjustment method, comprising:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
determining a backlight value corresponding to the picture to be displayed according to the average value of the brightness coefficients of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the average value of the brightness coefficients and the backlight value, and the determining the backlight value corresponding to the picture to be displayed according to the average value of the brightness coefficients of the picture to be displayed and the preset backlight value curve comprises:
calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein, LcalIs the average value of the luminance coefficients, j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
2. The method according to claim 1, wherein the determining the average value of the luminance coefficients of the to-be-displayed picture according to the number of pixels of the to-be-displayed picture in each preset luminance area and the pre-stored luminance coefficients corresponding to each preset luminance area comprises:
calculating the display waiting time according to the following formulaMean value L of brightness coefficient of displaycal：
Figure FDA0002462494610000011
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
3. The method according to claim 1, wherein the determining the backlight value corresponding to the to-be-displayed picture according to the average value of the luminance coefficients of the to-be-displayed picture and a preset backlight value curve comprises:
determining a preprocessing backlight value corresponding to the picture to be displayed according to the average brightness coefficient value of the picture to be displayed and a preset backlight value curve;
acquiring a backlight adjustment proportion;
and determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
4. The method of claim 1, further comprising:
and when the picture to be displayed is displayed, gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length.
5. A backlight adjustment apparatus, comprising:
the first acquisition module is used for acquiring the brightness information of a picture to be displayed;
the statistical module is used for counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
the first determining module is used for determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
the second determining module is used for determining a backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the brightness coefficient average value and the backlight value;
the second determining module comprises a second calculating submodule for calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein, LcalIs the average value of the luminance coefficients, j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
6. The apparatus of claim 5, wherein the first determining module comprises:
a first calculation submodule for calculating an average value L of the luminance coefficients of the picture to be displayed according to the following formulacal：
Figure FDA0002462494610000031
Wherein N is the number of the preset brightness areas, m × N is the number of the pixels in the picture to be displayed, kiK is more than or equal to 0 and is the brightness coefficient corresponding to the ith preset brightness areai≤255，niAnd the number of pixels of the picture to be displayed in the ith preset brightness area is determined.
7. The apparatus of claim 5, wherein the second determining module comprises:
the first determining submodule is used for determining a preprocessing backlight value corresponding to the picture to be displayed according to the brightness coefficient average value of the picture to be displayed and a preset backlight value curve;
the obtaining submodule is used for obtaining a backlight adjusting proportion;
and the second determining submodule is used for determining the backlight value corresponding to the picture to be displayed according to the preprocessing backlight value corresponding to the picture to be displayed and the backlight adjusting proportion.
8. The apparatus of claim 5, further comprising:
and the adjusting module is used for gradually adjusting the backlight value of the previous frame of display picture to the backlight value corresponding to the picture to be displayed according to a preset step length when the picture to be displayed is displayed.
9. A backlight adjustment apparatus, comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
acquiring brightness information of a picture to be displayed;
counting the number of pixels of the to-be-displayed picture in each preset brightness area according to the brightness information;
determining the average value of the brightness coefficients of the picture to be displayed according to the number of pixels of the picture to be displayed in each preset brightness area and the pre-stored brightness coefficients corresponding to each preset brightness area;
determining a backlight value corresponding to the picture to be displayed according to the average value of the brightness coefficients of the picture to be displayed and a preset backlight value curve, wherein the backlight value curve comprises a corresponding curve between the average value of the brightness coefficients and the backlight value, and the determining the backlight value corresponding to the picture to be displayed according to the average value of the brightness coefficients of the picture to be displayed and the preset backlight value curve comprises:
calculating the backlight value B L corresponding to the picture to be displayed according to the following formulacal：
BLcal＝BLj+(BLj+1-BLj)·(Lcal–j)
Wherein, LcalIs the average value of the luminance coefficients, j ═ Lcal]，BLjB L is a preset backlight value corresponding to j and is more than or equal to 0j≤255。
10. A computer readable storage medium storing computer instructions, wherein the computer instructions, when executed by a processor, implement the steps of the method of any one of claims 1 to 4.
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