CN109817170A - Pixel compensation method, device and terminal device - Google Patents
Pixel compensation method, device and terminal device Download PDFInfo
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- CN109817170A CN109817170A CN201711166453.1A CN201711166453A CN109817170A CN 109817170 A CN109817170 A CN 109817170A CN 201711166453 A CN201711166453 A CN 201711166453A CN 109817170 A CN109817170 A CN 109817170A
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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
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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
- G09G3/36—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
Abstract
This application provides pixel compensation method, device and terminal devices.This method comprises: obtaining the first backlight image of image to be processed, the back light unit in the pixel and backlight array in first backlight image is corresponded, and the backlight array is used to show that the image to be processed provides backlight；According to the position attribution of pixel, the pixel of first backlight image is divided, to obtain the multiple regions of first backlight image；The image in the multiple region is filtered and is amplified respectively, to obtain second backlight image identical with the resolution ratio of the image to be processed, wherein, when the image to the multiple region is filtered, the image at least two regions in the multiple region is applied different space filterings；Pixel compensation is carried out to the image to be processed according to the brightness value of second backlight image.The application can be improved display effect.
Description
Technical field
This application involves display picture element compensation technique fields, and more particularly, to a kind of pixel compensation method, dress
It sets and terminal device.
Background technique
In order to improve the dynamic range of display, usually the backlight module of display can be divided into several regions, so
The brightness of backlight module each region is adjusted according to the distribution situation of picture material afterwards, and pixel benefit is carried out to image pixel value
It repays, to improve the dynamic range of the display of display while guaranteeing display effect.
Traditional scheme is to carry out backlight smoothing processing according to the brightness of backlight area when carrying out pixel compensation to image, so
Pixel compensation is carried out to the region after backlight smoothing processing again afterwards, to guarantee display effect.Specifically, in backlight smoothing processing
When to entire backlight area using same Filtering Template carry out low-pass filtering, pixel compensation is then carried out again, due to backlight mould
Group is different in the light spread condition of different zones, is filtered using identical low-pass filtering template, cannot good mould
The spread condition of quasi- backlight, will lead to the poor display effect of final display.
Summary of the invention
The application provides a kind of pixel compensation method, device and terminal device, to improve display effect.
In a first aspect, a kind of pixel compensation method is provided, this method comprises: obtaining the first backlight figure of image to be processed
Picture, the back light unit in pixel and backlight array in first backlight image correspond, and the backlight array is used for
To show that the image to be processed provides backlight；According to the position attribution of pixel, to the pixel of first backlight image
It is divided, to obtain the multiple regions of first backlight image；The image in the multiple region is filtered respectively and
Amplification, to obtain second backlight image identical with the resolution ratio of the image to be processed, wherein to the multiple region
When image is filtered, the image at least two regions in the multiple region is applied different space filterings；According to institute
The brightness value for stating the second backlight image carries out pixel compensation to the image to be processed.
Above-mentioned backlight array includes multiple back light units, the number for the back light unit that backlight array includes and the first backlight figure
The number of pixel as in is identical.
In the application, by the way that different types of space is respectively adopted for the image at least two regions in multiple regions
Filtering is filtered, and compared in such a way that uniform filtering template is filtered, can preferably simulate backlight diffusion,
The image after pixel compensation is enabled to obtain preferable display effect in display.
With reference to first aspect, in certain implementations of first aspect, according to the position attribution of the pixel, to institute
The pixel for stating the first backlight image is divided, to obtain the multiple regions of first backlight image, comprising: belong to position
The identical pixel of property is divided into the same area, wherein the identical number including neighbor pixel of the position attribution is identical
Or with the center of first backlight image apart from identical.
It, can be to the identical pixel of position attribution by the way that the identical pixel of position attribution to be divided into the same area
Using identical space filtering, the different pixel in position uses different filtering, can preferably simulate the light of different location
Diffusion phenomena, so as to improve the effect of display.
Optionally, the identical number that can also refer to neighbor pixel of position attribution within a preset range, for example, adjacent picture
Pixel of the number of vegetarian refreshments less than or equal to 5 may belong to same position attribution, and the number of neighbor pixel is greater than 5
Pixel, which can consider, belongs to another position attribution.
With reference to first aspect, in certain implementations of first aspect, the position attribution according to pixel, to institute
The pixel for stating the first backlight image is divided, to obtain the multiple regions of first backlight image, comprising: will have 8
The pixel position of a neighbor pixel is divided into first area；Pixel position with 5 neighbor pixels is divided into
Second area；Pixel position with 3 neighbor pixels is divided into third region.
With reference to first aspect, described according to the bright of second backlight image in certain implementations of first aspect
Angle value carries out pixel compensation to the image to be processed, comprising: from the image to be processed, obtains any one pixel
First brightness value；From second backlight image, obtain and the pixel of any one pixel opposite position
Second brightness value；Obtain maximum brightness value, brightness upper limit or institute of the maximum brightness value for second backlight image
State the brightness upper limit that back light unit can be shown；According to the maximum brightness value and second brightness value, determine described in
The penalty coefficient of any one pixel；According to the penalty coefficient, to the first brightness value of any one pixel into
Row compensation, to obtain the target brightness value of any one pixel.
Due to using different space filterings, energy for different regions during obtaining the second backlight image
Enough preferably simulation backlight diffusion phenomena, in this way, in the subsequent progress pixel compensation to image to be processed, it can be according to backlight
True brightness value carries out pixel compensation to pixel to be processed, to obtain preferable pixel compensation effect.
With reference to first aspect, described according to the penalty coefficient in certain implementations of first aspect, to described
First brightness value an of pixel of anticipating compensates, to obtain the target brightness value of any one pixel, comprising: will
The product of first brightness value and the penalty coefficient is determined as the target brightness value of any one pixel.
With reference to first aspect, in certain implementations of first aspect, the penalty coefficient obtains according to the following formula:
K=log2(BLmax/BL)1.0/γ
Wherein, K is the penalty coefficient, BLmaxFor the maximum brightness value, BL is second brightness value, and γ is default
Gamma factor, γ can generally take 2.2.
Since human eye is similar to the processing links of approximate log algorithm to the processing of picture signal, to pixel
By taking logarithm during compensating, the contrast of image can be effectively improved.In addition, in above-mentioned formula, BLmax
By taking maximum brightness value, penalty coefficient K is enabled to be unlikely to excessive, to avoid that pixel occurs when carrying out pixel compensation
It overflows.
With reference to first aspect, in certain implementations of first aspect, when the picture format to be processed is RGB, institute
State the first brightness value for obtaining any one pixel in the image to be processed, comprising: will any one described pixel
Three component values in largest component value be determined as first brightness value；Alternatively, according to any one pixel
Three component values calculate first brightness value.
It optionally, can specific root when three component values according to any one pixel are to calculate the first brightness value
According to formula: Y=((R*299)+(G*587)+(B*114))/1000 is calculated, wherein and Y indicates the first brightness value, R, G and B points
Three component values of pixel to be processed are not indicated.
Second aspect, provides a kind of pixel compensation device, and the pixel compensation device includes for executing described first
The module of aspect or the method in its various implementation.
The third aspect provides a kind of pixel compensation device, and the pixel compensation device includes: memory, for storing journey
Sequence；Processor, for executing the program of the memory storage, when described program is performed, the processor is for executing
Method in the first aspect or its various implementation.
Fourth aspect, provides a kind of terminal device, and the terminal device includes the pixel compensation dress in the second aspect
It sets and display, wherein the display is for showing that the pixel compensation device carries out pixel to the image to be processed
Compensated image.
5th aspect, provides a kind of terminal device, the terminal device includes: memory, for storing program；Processing
Device, for executing the program of the memory storage, when described program is performed, the processor is for executing described first
Method in aspect or its various implementation.
6th aspect, provides a kind of computer-readable medium, and the computer-readable medium storage is executed for equipment
Program code, said program code include the instruction for executing the method in first aspect or its various implementation.
Detailed description of the invention
Fig. 1 is the schematic flow chart of the pixel compensation method of the embodiment of the present application；
Fig. 2 is the schematic diagram of backlight array；
Fig. 3 is the schematic diagram of the first backlight image；
Fig. 4 is the schematic diagram of the multiple regions of the first backlight image；
Fig. 5 is the schematic diagram of the multiple regions of the first backlight image；
Fig. 6 is the schematic diagram of the multiple regions of the first backlight image；
Fig. 7 is the schematic flow chart of the pixel compensation method of the embodiment of the present application；
Fig. 8 is the schematic diagram of Filtering Template；
Fig. 9 is the schematic diagram of pixel compensation curve；
Figure 10 is the schematic block diagram of the pixel compensation device of the embodiment of the present application；
Figure 11 is the schematic block diagram of the terminal device of the embodiment of the present application.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the application is described.
The dynamic range of image is generally the ratio of most dark brightness and most brightness, and ratio more Larger Dynamic range is bigger, figure
As can shown in level it is more, the effect of display is also better.
The brightness range of nature is wider, from starry sky under night scene (10-3cd/m2) arrive sun intrinsic brightness (105cd/m2)
The brightness range of about 8 orders of magnitude, human eye can capture 5 orders of magnitude due to its own adjustment mechanism from nature
Brightness range.But current display can only generally show the dynamic range of 2~3 orders of magnitude, can not reflect
The real information for the natural scene that human eye is watched.
In order to improve the dynamic range of display, enable display closer to the dynamic range in natural scene, from
And preferably reflect the real information of natural scene.Region backlight dimming technology can be generally taken, which generally comprises two
Most of: backlight illumination extracts and pixel compensation.
Wherein, backlight illumination extraction, which refers to, is divided into several subregions for backlight module (shape of subregion can be rectangle region
Domain), the characteristic parameter of the subregion luminance information then can be characterized come Dynamic Extraction according to the corresponding picture material of each subregion,
Then the brightness of the back light unit of each subregion is determined according to the parameter.
After the brightness that each subregion of backlight module has been determined, should the brightness to pixel carry out certain adjustment, make
The color of image that front and back must be adjusted does not occur big deviation, guarantees display effect.After obtaining backlight illumination, need to simulate backlight
Diffusion way, and then each pixel for obtaining liquid crystal display (Liquid Crystal Display, LCD) panel is corresponding
Therefore brightness value carries out pixel compensation further according to the brightness value of each pixel, how to simulate backlight diffusion, how to carry out pixel
Compensation, guarantees that display effect is a problem to be solved.
It is described in detail below with reference to pixel compensation method of the Fig. 1 to the embodiment of the present application.
Fig. 1 is the schematic flow chart of the pixel compensation method of the embodiment of the present application.Method shown in FIG. 1 can be by liquid crystal
Display equipment, intelligent terminal, tablet computer, desktop computer etc. can show the equipment of video to execute.Method shown in FIG. 1
Including step 101 to step 104, step 101 to step 104 is described in detail below with reference to specific example.
101, the first backlight image of image to be processed is obtained.
Wherein, above-mentioned first backlight image is the brightness for the backlight array for showing the display equipment of the image to be processed
It is worth the two-dimensional matrix of composition, also, (backlight array is used for as display for the pixel in first backlight image and backlight array
Image to be processed provides backlight) in back light unit be it is one-to-one, the brightness value of each pixel is for indicating backlight battle array
The brightness of corresponding back light unit in column.In addition, the number for the back light unit that above-mentioned backlight array includes and the first backlight image
In pixel number it is identical.
It should be understood that the backlight array of display equipment is made of multiple back light units, the brightness of each back light unit can be single
(brightness that each back light unit can be adjusted by the control unit of display) solely is adjusted, the area where each back light unit
Domain is properly termed as a subregion of backlight array.
For example, the backlight array of display is by a back light unit group of M × N (M be more than or equal to 1 integer with N)
At, then, the whole region of the backlight array is made of M × N number of subregion, correspondingly, the first backlight image just includes M × N number of
Pixel, each pixel correspond to a subregion in backlight matrix.
As shown in Fig. 2, the whole region of backlight array is made of 6 × 10 subregions, each subregion is provided with a backlight
Unit.Correspondingly, the first backlight image is as shown in figure 3, first backlight image includes 6 × 10 pixel compositions, each picture
A subregion in backlight array in vegetarian refreshments corresponding diagram 2.
102, according to the position attribution of pixel, the pixel of the first backlight image is divided, with obtain this first
The multiple regions of backlight image.
It, can be by position attribution (or referred to as location type) phase when the pixel to the first backlight image divides
Same pixel is divided into the same region, that is to say, that the pixel being divided into the same area position having the same
Attribute, thus there are certain similar features, it can be using at identical Filtering Template in subsequent be filtered
Reason.
Optionally, the pixel of the first backlight image is carried out according to the position attribution of pixel as one embodiment
Region division, to obtain the multiple regions of first backlight image, comprising: be divided into the identical pixel of position attribution identical
Region in.
Above-mentioned position attribution is identical may include neighbor pixel number is identical or center with the second backlight image
Positional distance is identical.
It specifically,, can be with if the number of the neighbor pixel of certain pixels is identical in the first backlight image
Think that the position attribution of these pixels is identical.
Optionally, the pixel of the first backlight image is carried out according to the position attribution of pixel as one embodiment
It divides, to obtain the multiple regions of first backlight image, comprising: will be divided with the pixel position of 8 neighbor pixels
To first area；Pixel position with 5 neighbor pixels is divided into second area；There to be 3 neighbor pixels
Pixel position be divided into third region.
For example, as shown in figure 4, in the first region, the number of the neighbor pixel of each pixel is 8, the secondth area
The number of the neighbor pixel of each pixel in domain is 5, the neighbor pixel of each pixel in third region
Number is 3.
Optionally, in the first backlight image, if certain pixels phase at a distance from the first backlight image center
Deng then it is also assumed that the position attribution of these pixels is identical.
Specifically, the pixel that first distance is less than with a distance from the first backlight image center can be divided into one
A region, and the pixel for being greater than first distance with a distance from the first backlight image center is divided into another region.
For example, as shown in figure 5, the pixel click and sweep that two pixels will be greater than with a distance from the first backlight image center
It assigns in first area, the pixel click and sweep of two pixels will be less than or equal to a distance from the first backlight image center
It assigns in second area.In Fig. 5, the pixel in first area is mainly pixel closer with a distance from center
Point, and the pixel in second area is mainly pixel distant with a distance from center.It should be understood that each pixel
Refer to horizontal distance of the edge far from center point or vertical of the pixel with a distance from the first backlight image center
Distance.
Optionally, the identical number that can also refer to neighbor pixel of position attribution within a preset range, for example, first
In backlight image, pixel of the number less than or equal to 5 of neighbor pixel, which can consider, belongs to same position attribution, phase
Pixel of the number of adjacent pixel greater than 5, which can consider, belongs to another position attribution.
For example, as shown in fig. 6, the pixel by the number of neighbor pixel greater than 5 is divided into first area (the firstth area
The number of the neighbor pixel of each pixel in domain is 8), the number of neighbor pixel to be less than or equal to 5 pixel
Point is divided into second area (number of the neighbor pixel of the pixel in second area is 5 or 3).
Optionally, it is also believed that being in the pixel position attribution having the same at backlight image edge, and in back
Pixel position attribution having the same inside light image.It is also shown in FIG. 6, it can will be in most in the first backlight image
The pixel at edge is divided into first area, and remaining pixel is divided into second area.
It should be understood that using the different available identical region divisions of division mode as a result, for example, shown in fig. 6 stroke
Point result can be according to whether what is obtained in edge to divide the mode in region, be also possible to the number according to neighbor pixel
Obtained from whether mesh is divided within a preset range.
It, can be to the identical pixel of position attribution by the way that the identical pixel of position attribution to be divided into the same area
Using identical space filtering, the effect of filtering can be improved.
103, the image of multiple regions is filtered and is amplified respectively, it is identical as the resolution ratio of image to be processed to obtain
The second backlight image.
Wherein, when the image to multiple regions is filtered, the image at least two regions in multiple regions is answered
With different space filterings.
In addition, the image at least two regions can be referred to using different space filterings at least two regions
Image can be using different Filtering Templates (specifically can be low-pass filtering template), different filtering moulds when being filtered
The filter factor of plate can be different.
104, pixel compensation is carried out to image to be processed according to the brightness value of second backlight image.
In the application, different types of space filtering is used by the image at least two regions in multiple regions
It is filtered, compared in such a way that uniform filtering template is filtered, can preferably simulate backlight diffusion, so that
Image after pixel compensation can obtain preferable display effect in display.
Refer to it should be understood that carrying out pixel compensation to image to be processed in this application to each pixel in image to be processed
The brightness value of point is compensated or is adjusted.
Since the second backlight image is identical as the image resolution ratio of image to be processed, each of image to be processed
There is a corresponding position in pixel, indicate image to be processed in the backlight illumination of above-mentioned position in the second backlight image
Value, can compensate according to the pixel of the pixel value image corresponding position to be processed of the second backlight image.
Optionally, as one embodiment, pixel benefit is carried out to image to be processed according to the brightness value of the second backlight image
It repays, specifically includes: from image to be processed, obtaining the first brightness value of any one pixel；From the second backlight image, obtain
Take the second brightness value with the pixel of any one pixel corresponding position；Obtain maximum brightness value；According to maximum brightness
Value and the second brightness value, determine the penalty coefficient of any one pixel；According to penalty coefficient, to any one pixel
First brightness value compensates, to obtain the target brightness value of the pixel.
Above-mentioned maximum brightness value refers to the brightness that the brightness upper limit of the second backlight image or back light unit can be shown
Upper limit value.
Due to using different space filterings, energy for different regions during obtaining the second backlight image
Enough preferably simulation backlight diffusion phenomena, in this way, in the subsequent progress pixel compensation to image to be processed, it can be according to backlight
True brightness value carries out pixel compensation to pixel to be processed, to obtain preferable pixel compensation effect.
Optionally, when being compensated according to first brightness value of the penalty coefficient to any one pixel, must take office
Anticipate a pixel target brightness value when, specifically can be by the first brightness value of penalty coefficient and any one pixel
Target brightness value of the product as any one pixel.
Above-mentioned penalty coefficient can pass through formula K=log2(BLmax/BL)1.0/γTo calculate, wherein K is penalty coefficient,
BLmaxFor maximum brightness value, BL is the second brightness value, and γ is preset gamma factor, and γ can be the experience being determined by experiment
Value, γ can generally take 2.2.
Since human eye is similar to the processing links of approximate log algorithm to the processing of picture signal, to pixel
By taking logarithm during compensating, the contrast of image can be effectively improved.And then obtain better pixel compensation
Effect.In addition, in above-mentioned formula, BLmaxBy taking maximum brightness value, penalty coefficient K is enabled to be unlikely to excessive, thus
It avoids that pixel spilling occurs when carrying out pixel compensation.
In addition, in the first brightness value for determining any one pixel, if the picture format of image to be processed is RGB
When, it is possible to the largest component value in three component values of any one pixel is determined as the first brightness value, or
Person calculates the first brightness value according to the three of any one pixel component values.
It, can be according to formula Y=((R* when three component values according to pixel to be processed are to calculate the first brightness value
299)+(G*587)+(B*114))/1000 calculate, wherein Y indicates the first brightness value, and R, G and B respectively indicate picture to be processed
Three component values of vegetarian refreshments.
By the way that the largest component value in three components is directly determined as the first brightness value, the first brightness can be quickly determined
Value, can reduce certain computation complexity.And it when calculating the first brightness value, can be obtained more acurrate by three component values
Brightness value, convenient for it is subsequent progress preferably carry out pixel compensation.
Below with reference to specific example, more detailed description the embodiment of the present application, it should be appreciated that embodiment shown in Fig. 7
It is to help it will be understood by those skilled in the art that the embodiment of the present application, and does not really want the embodiment of the present application being limited to Fig. 7's
Specific value and concrete scene shown in method.Those skilled in the art can be carried out various with embodiment according to figure 7
Perhaps these modifications of variation or variation are also fallen into the range of the embodiment of the present application for modification of equal value.
Fig. 7 is the schematic flow chart of the pixel compensation method of the embodiment of the present application.Method shown in Fig. 7 can be by liquid crystal
Display equipment, intelligent terminal, tablet computer, desktop computer etc. can show the equipment of video to execute.Method shown in Fig. 7
Comprising the following steps:
201, the first backlight image is determined.
It can include multiple back light units in the backlight array of display, the brightness value of each back light unit can be according to the back
The corresponding picture material of light unit carries out dynamic adjustment, so that the dynamic range of display increases.Backlight battle array after backlight adjustment
The brightness value of whole back light units in column can form first backlight image, each of first backlight image picture
The brightness value of vegetarian refreshments corresponds to the brightness of each of backlight array back light unit.
The number of back light unit for including in the size of first backlight image and backlight array is related, it is assumed that in backlight array
Comprising M × N number of back light unit, then, the brightness value of the pixel of the first backlight image also forms the matrix of M × N size,
First backlight image BLinitIn each pixel brightness value specifically can using formula (1) indicate.
202, the pixel of the first backlight image is divided.
It should be understood that each pixel in the first backlight image corresponds to a back light unit in backlight array, each picture
The brightness value of vegetarian refreshments is used to indicate the brightness of corresponding back light unit.
Above-mentioned first backlight image BLinitOne shared M × N number of pixel composition, for first backlight image, no
The number of the neighbor pixel of same pixel may be different, for the pixel in the first backlight image edge,
The number of neighbor pixel is less than the number of the neighbor pixel for the pixel being located inside the first backlight image, also
It is to say, there is different regions in the first backlight image, the quantity of the neighbor pixel of the pixel in some regions
Less, the quantity of the neighbor pixel in some regions is relatively more, in this way during light is spread, the light diffusion of different zones
It is also just different with mixing situation.
It therefore, can be according to the first backlight figure in order to preferably simulate the backlight diffusion phenomena in different different type regions
The position of each pixel, divides the pixel of the first backlight image, to obtain different regions as in.
As shown in figure 4, for the first backlight image being made of for one 6 × 10 pixels, it can be by the first back
Light image is divided into three regions, wherein the number of the neighbor pixel of each pixel in first area be 3, second
The number of the neighbor pixel of each pixel in region is 5, the neighbor pixel of each pixel in third region
Number be 8.
203, light mixing is carried out to the different zones of the first backlight image respectively using different Filtering Templates, after obtaining light mixing
Backlight image BLmixed。
It, can be using figure when first backlight image obtained in the step 202 is divided into three regions as shown in Figure 4
First Filtering Template, the second Filtering Template shown in 8 and third Filtering Template respectively in the first backlight image first area,
Second area and third region carry out light mixing.
Specifically, can be handled, first area to obtain each of first area using formula (2)
The brightness value of pixel after treatment.
BLmixed_redi,j=a × BLi,j+b×BLi,j+1+c×BLI+1, j+d×BLi+1,j+1 (2)
For second area, light mixing processing can be carried out using formula (3), to obtain each pixel in second area
Point is in light mixing treated brightness value.
BLmixed_greeni,j=a × BLi,j+b×(BLi,j-1+BLi,j+1)+c×BLi+1,j+d×(BLi+1,j-1+BLi+1,j+1)
(3)
For third region, light mixing processing can be carried out using formula (4), to obtain each pixel in third region
Point is in light mixing treated brightness value.
In above-mentioned formula (2) into formula (4), a, b, c, d are the first Filtering Template, the second Filtering Template and respectively
The coefficient of three Filtering Templates.Wherein, a is located at the center of diffusion template, indicates remaining luminous energy after the diffusion of light dispersal center
The coefficient of amount, b, c, d are distributed in the surrounding of diffusion template, respectively indicate light dispersal center to the coefficient of the diffusivity of surrounding.
It is assumed that the conservation of energy of the light in communication process, then, the coefficient of the first Filtering Template meets a+b+c+d=1, the second filtering mould
The coefficient of plate meets a+2b+c+2d=1, and the coefficient of third Filtering Template meets a+2b+2c+4d=1.
The specific value of above-mentioned a, b, c, d can be obtained by many experiments, and the coefficient of different filter templates is as follows:
First kind Filtering Template: a=0.4, b=0.2, c=0.2, d=0.2
Second class Filtering Template: a=0.38, b=0.15, c=0.12, d=0.1
Third class Filtering Template: a=0.38, b=0.112, c=0.02, d=0.06
204, to the backlight image BL after light mixingmixedIt is extended, the backlight image BL after being expandedexpand。
When extending the backlight image after light mixing, the method that linear difference can be used, it is possible to further use two-wire
Property differential technique is extended the backlight image after light mixing.When extending the backlight image after light mixing can every time by light mixing after
Backlight image expands as original twice, for example, the light mixing matrix B L before extensionmixedSize be M × N, the light mixing after extension
Matrix B LexpandSize be 2M × 2N.It should be understood that here can also be using any one difference approach to the backlight after light mixing
Image is extended.
205, the backlight image BL after extension is determinedexpandEach region between backlight smoothly whether reach default effect
Fruit.
If BLexpandBacklight between middle each region smoothly reaches default effect, then step 206 is executed, if do not had
Have and reach smooth effect and can so continue to execute above-mentioned steps 203 and step 204, until BLexpandEach region between reach
Good smooth effect, that is, BL are arrivedexpandEach region between without apparent block boundary.
206, the backlight image after extension is extended to the size of image to be processed again, is obtained eventually for pixel compensation
Target backlight image BLfinal。
It should be understood that expanding BLexpandWhen, if the size of image to be processed is 160 × 160, BLexpandSize be 64
× 64, it is possible to first by BLexpandExpand twice, bilinear interpolation (can specifically then be used by the method for interpolation again
Method) obtain target backlight image BL identical with picture size to be processedfinal。
207, image to be processed is transformed into yuv format by rgb format.
208, according to target backlight image BLfinalPixel compensation is carried out to image to be processed.
Specifically, formula (5) can be used to carry out pixel compensation in a manner of taking logarithm.
In formula (5), Yi,jFor the pixel intensity before pixel (i, the j) compensation in image to be processed, Y 'I, jFor wait locate
Manage the compensated pixel intensity of pixel (i, j) in image, BL 'maxFor target backlight image BLfinalMaximum value, take here
The purpose of maximum value is the BL ' in order to avoid pixel occurs when carrying out pixel compensation and overflowsI, jFor target backlight image BLfinalIn
Corresponding to the backlight illumination of the pixel (i, j) in image to be processed, Ki,jFor the luminance compensation coefficient of pixel, γ is gamma system
Number, γ generally take 2.2.
In order to enable color distortion does not occur in image after local dimming, need to do UV component compensation identical with Y-component,
Specifically UV component can also be compensated according to formula (6).
It is carried out based on above-mentioned formula (5) and formula (6) shown in logarithmic curve of the curve of pixel compensation such as in Fig. 9, in Fig. 9
In, with original pixel brightness value YinIncrease, the degree of pixel compensation gradually weakens (YoutIncreasing degree be gradually reduced).
That is, for low brightness pixel, due to its backlight degree reduce it is more, reduce for effective compensation backlight illumination caused by
Display brightness reduction, low brightness pixel is made largely compensation just can guarantee and when backlight all light display effect
Fruit is consistent substantially；It is less due to being reduced when its backlight illumination is relative to backlight all light and for high luminance pixel,
Only need to do lesser degree of compensation it is ensured that being consistent substantially with display effect when backlight all light.Therefore, in this Shen
Please in carry out pixel compensation when can effectively avoid due to pixel compensation degree it is excessive caused by pixel overflow distortion.
209, the image to be processed after pixel compensation is converted into rgb format by yuv format, then after obtaining pixel compensation
Image.
The main purpose of pixel compensation is to guarantee that the color of image is undistorted after being adjusted to backlight illumination.
Optionally, after carrying out pixel compensation, in order to further increase the contrast of image, pixel is being carried out to image
After compensation, image degree of comparing can be stretched.Due to the image after carrying out backlight illumination adjustment and pixel compensation
It is exactly that place dark in image is darker, and bright part is brighter to one subjective effect of people's bring, therefore, can be incited somebody to action according to brightness
Image after pixel compensation is divided into low-light level section, intermediate luminance section and high brightness section, can be with for low-light level section and high brightness section
It is respectively adopted exponential transform, and is to carry out gray compression to low-light level section, be that carry out is expansion of gradation, centering to high brightness section
Between brightness section be carry out linear transformation, specific transformation for mula can be as shown in (7).
In formula (7) formula, Y 'I, jIt is the brightness after pixel compensation, Y "I, jBe degree of comparing stretch after pixel it is bright
Degree, H1And H2It is comprising the corresponding pixel brightness value of the total pixel 10% and 90% of image and luminance transformation after pixel compensation respectively
The waypoint of curve.Since low-light level section brightness is dimmed by compression, and high brightness section brightness is brightened due to extension, so that figure
The bright dark difference of picture is more obvious, to effectively increase picture contrast.
To guarantee that color is undistorted, the transformation that multiple identical as Y-component is done to UV component is also needed, it specifically, can be with
Identical processing is carried out to UV component using formula (8).
Wherein, Y 'I, jIt is the brightness after pixel compensation, Y "I, jIt is the pixel intensity after degree of comparing stretches, Ki,jFor picture
The luminance compensation coefficient of element, U 'i,jWith V 'i,jIt is the U component and V component after pixel compensation, U "I, jWith V "I, jIt is degree of comparing
U component and V component after stretching.
It is described in detail above in association with pixel compensation method of the Fig. 1 to Fig. 9 to the embodiment of the present application, below with reference to
The pixel compensation device and terminal device of the embodiment of the present application is described in detail in Figure 10 and Figure 11, it should be appreciated that Tu10He
Pixel compensation device and terminal device shown in Figure 11 are able to carry out the pixel compensation method of the embodiment of the present application, can be realized this
Apply for each step of the pixel compensation method of embodiment, for sake of simplicity, below in the pixel compensation of description the embodiment of the present application
Repetitive description is suitably omitted when device and terminal device.
Figure 10 is the schematic block diagram of the pixel compensation device of the embodiment of the present application.Pixel compensation device shown in Fig. 10
300 are able to carry out the pixel compensation method of the embodiment of the present application, and pixel compensation device 300 specifically includes:
Obtain module 301, the pixel for obtaining the first backlight image of image to be processed, in first backlight image
Point is corresponded with the back light unit in backlight array, and the backlight array is used to show that the image to be processed provides back
Light；
Processing module 302 draws the pixel of first backlight image for the position attribution according to pixel
Point, to obtain the multiple regions of first backlight image；
Processing module 302 is also used to that the image in the multiple region is filtered and is amplified respectively, with obtain with it is described
Identical second backlight image of the resolution ratio of image to be processed, wherein when the image to the multiple region is filtered, institute
The image for stating at least two regions in multiple regions is applied different space filterings；
Pixel compensation module 303, for being carried out according to the brightness value of second backlight image to the image to be processed
Pixel compensation.
In the application, by the way that different types of space is respectively adopted for the image at least two regions in multiple regions
Filtering is filtered, and compared in such a way that uniform filtering template is filtered, can preferably simulate backlight diffusion,
The image after pixel compensation is enabled to obtain preferable display effect in display.
Optionally, as one embodiment, the processing module 302 is specifically used for:
Pixel position with 8 neighbor pixels is divided into first area；
Pixel position with 5 neighbor pixels is divided into second area；
Pixel position with 3 neighbor pixels is divided into third region.
Optionally, as one embodiment, the pixel compensation module 303 is specifically used for:
From the image to be processed, the first brightness value of any one pixel is obtained；
From second backlight image, second with the pixel of any one pixel opposite position is obtained
Brightness value；
Obtain maximum brightness value, brightness upper limit or the back of the maximum brightness value for second backlight image
The brightness upper limit that light unit can be shown；
According to the maximum brightness value and second brightness value, the compensation system of any one pixel is determined
Number；
According to the penalty coefficient, the first brightness value of any one pixel is compensated, it is described to obtain
The target brightness value of any one pixel.
Optionally, as one embodiment, the pixel compensation module 303 is specifically used for:
The target that the product of first brightness value and the penalty coefficient is determined as any one pixel is bright
Angle value.
Optionally, as one embodiment, the penalty coefficient obtains according to the following formula:
K=log2(BLmax/BL)1.0/γ (9)
Wherein, K is the penalty coefficient, BLmaxFor the maximum brightness value, BL is second brightness value, and γ is default
Gamma factor.
Optionally, as one embodiment, when the picture format to be processed is RGB, the acquisition module 301 is specifically used
In:
Largest component value in three component values of any one pixel is determined as first brightness value；
Alternatively,
According to the three of any one pixel component values, first brightness value is calculated.
Figure 11 is the schematic block diagram of the terminal device of the embodiment of the present application.Terminal device 400 shown in Figure 11 includes picture
Plain compensation device 401 and display 402, pixel compensation device 401 here can be pixel compensation device shown in Figure 10
300, the pixel compensation device 401 in terminal device is able to carry out the pixel compensation method of the embodiment of the present application to image to be processed
Pixel compensation is carried out, display 402 can show the image after the progress pixel compensation of pixel compensation device 401.
Present invention also provides a kind of pixel compensation device, the pixel compensation device includes: memory, for storing journey
Sequence；Processor, for executing the program of the memory storage, when described program is performed, the processor is for executing
The pixel compensation method of the embodiment of the present application.
Present invention also provides a kind of terminal device, the terminal device includes: memory, for storing program；Processing
Device, for executing the program of the memory storage, when described program is performed, the processor is for executing the application reality
Apply the pixel compensation method of example.
The application also provides a kind of computer-readable medium, and the computer-readable medium storage is used for the journey that equipment executes
Sequence code, said program code include the instruction for executing the pixel compensation method of the embodiment of the present application.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), arbitrary access are deposited
The various media that can store program code such as reservoir (Random Access Memory, RAM), magnetic or disk.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (13)
1. a kind of pixel compensation method characterized by comprising
Obtain the first backlight image of image to be processed, the backlight in pixel and backlight array in first backlight image
Unit corresponds, and the backlight array is used to show that the image to be processed provides backlight；
According to the position attribution of pixel, the pixel of first backlight image is divided, to obtain first back
The multiple regions of light image；
The image in the multiple region is filtered and is amplified respectively, it is identical as the resolution ratio of the image to be processed to obtain
The second backlight image, wherein when the image to the multiple region is filtered, in the multiple region at least two
The image in region is applied different space filterings；
Pixel compensation is carried out to the image to be processed according to the brightness value of second backlight image.
2. the method as described in claim 1, which is characterized in that the position attribution according to pixel, to first back
The pixel of light image is divided, to obtain the multiple regions of first backlight image, comprising:
Pixel position with 8 neighbor pixels is divided into first area；
Pixel position with 5 neighbor pixels is divided into second area；
Pixel position with 3 neighbor pixels is divided into third region.
3. method according to claim 1 or 2, which is characterized in that the brightness value pair according to second backlight image
The image to be processed carries out pixel compensation, comprising:
From the image to be processed, the first brightness value of any one pixel is obtained；
From second backlight image, the second brightness with the pixel of any one pixel opposite position is obtained
Value；
Obtain maximum brightness value, brightness upper limit or the backlight list of the maximum brightness value for second backlight image
The brightness upper limit that member can be shown；
According to the maximum brightness value and second brightness value, the penalty coefficient of any one pixel is determined；
According to the penalty coefficient, the first brightness value of any one pixel is compensated, it is described any to obtain
The target brightness value of one pixel.
4. method as claimed in claim 3, which is characterized in that it is described according to the penalty coefficient, to any one described picture
First brightness value of vegetarian refreshments compensates, to obtain the target brightness value of any one pixel, comprising:
The product of first brightness value and the penalty coefficient is determined as to the target brightness value of any one pixel.
5. method described in claim 3 or 4, which is characterized in that the penalty coefficient obtains according to the following formula:
K=log2(BLmax/BL)1.0/γ
Wherein, K is the penalty coefficient, BLmaxFor the maximum brightness value, BL is second brightness value, and γ is preset gal
Horse coefficient.
6. the method as described in any one of claim 3-5, which is characterized in that the picture format of the image to be processed is
When RGB, first brightness value for obtaining any one pixel in the image to be processed, comprising:
Largest component value in three component values of any one pixel is determined as first brightness value；
Alternatively,
According to the three of any one pixel component values, first brightness value is calculated.
7. a kind of pixel compensation device characterized by comprising
Module is obtained, for obtaining the first backlight image of image to be processed, pixel and back in first backlight image
Back light unit in optical arrays corresponds, and the backlight array is used to show that the image to be processed provides backlight；
Processing module divides the pixel of first backlight image for the position attribution according to pixel, with
To the multiple regions of first backlight image；
The processing module is also used to that the image in the multiple region is filtered and is amplified respectively, to obtain with described wait locate
Manage identical second backlight image of resolution ratio of image, wherein described more when the image to the multiple region is filtered
The image at least two regions in a region is applied different space filterings；
Pixel compensation module, for carrying out pixel benefit to the image to be processed according to the brightness value of second backlight image
It repays.
8. device as claimed in claim 7, which is characterized in that the processing module is specifically used for:
Pixel position with 8 neighbor pixels is divided into first area；
Pixel position with 5 neighbor pixels is divided into second area；
Pixel position with 3 neighbor pixels is divided into third region.
9. device as claimed in claim 7 or 8, which is characterized in that the pixel compensation module is specifically used for:
From the image to be processed, the first brightness value of any one pixel is obtained；
From second backlight image, the second brightness with the pixel of any one pixel opposite position is obtained
Value；
Obtain maximum brightness value, brightness upper limit or the backlight list of the maximum brightness value for second backlight image
The brightness upper limit that member can be shown；
According to the maximum brightness value and second brightness value, the penalty coefficient of any one pixel is determined；
According to the penalty coefficient, the first brightness value of any one pixel is compensated, it is described any to obtain
The target brightness value of one pixel.
10. device as claimed in claim 9, which is characterized in that the pixel compensation module is specifically used for:
The product of first brightness value and the penalty coefficient is determined as to the target brightness value of any one pixel.
11. device described in claim 9 or 10, which is characterized in that the penalty coefficient obtains according to the following formula:
K=log2(BLmax/BL)1.0/γ
Wherein, K is the penalty coefficient, BLmaxFor the maximum brightness value, BL is second brightness value, and γ is preset gal
Horse coefficient.
12. the device as described in any one of claim 9-11, which is characterized in that when the picture format to be processed is RGB,
The acquisition module is specifically used for:
Largest component value in three component values of any one pixel is determined as first brightness value；
Alternatively,
According to the three of any one pixel component values, first brightness value is calculated.
13. a kind of terminal device, which is characterized in that the terminal device includes the picture as described in any one of claim 7-12
Plain compensation device and display, wherein the display is for showing the pixel compensation device to the image to be processed
Image after carrying out pixel compensation.
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| CN112348759A (en) * | 2020-11-25 | 2021-02-09 | Oppo广东移动通信有限公司 | Image display method and apparatus, terminal and readable storage medium |
| CN112508820A (en) * | 2020-12-18 | 2021-03-16 | 维沃移动通信有限公司 | Image processing method and device and electronic equipment |
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