CN116095398A - Sub-pixel rendering method and system of RGBG display panel - Google Patents

Sub-pixel rendering method and system of RGBG display panel Download PDF

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CN116095398A
CN116095398A CN202211411060.3A CN202211411060A CN116095398A CN 116095398 A CN116095398 A CN 116095398A CN 202211411060 A CN202211411060 A CN 202211411060A CN 116095398 A CN116095398 A CN 116095398A
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pixel
target
sub
source
target image
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潘建红
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Glenfly Tech Co Ltd
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Glenfly Tech Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44012—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving rendering scenes according to scene graphs, e.g. MPEG-4 scene graphs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention discloses a sub-pixel rendering method and a sub-pixel rendering system of an RGBG type display panel, wherein the method comprises the steps of establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of target images on the RGBG type display panel; calculating a weight factor in an interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel; and weighting and calculating the target sub-pixel value of each target image sub-pixel in each target pixel through an interpolation algorithm formula according to the weight factors. The system includes a mapping module, a first computing module, and a second computing module. The technical scheme of the invention can reduce the image information loss before and after sub-pixel rendering, eliminate the color edge effect, reduce the edge blurring and simultaneously improve the conversion speed.

Description

Sub-pixel rendering method and system of RGBG display panel
Technical Field
The invention relates to the technical field of image display, in particular to a sub-pixel rendering method and a sub-pixel rendering system of an RGBG display panel.
Background
AMOLED (Active-matrix organic light-emitting diode) screen RGB (Red Green Blue, red-Green-Blue color mode, representing the colors of three channels of Red, green and Blue) sub-pixels are made of Red-Green-Blue self-luminous organic materials, and a person skilled in the art often solves the problems of high manufacturing cost and increased driving circuit design difficulty by changing the arrangement of the sub-pixels and reducing the number of the sub-pixels.
In the prior art, the structure of the subpixel arrangement includes many kinds of RGB-stripe structure, RGB-delta structure, RGBG structure, etc. In the RGBG structure, each pixel unit is formed by two sub-pixels RG or BG, and if a direct mapping mode is adopted, serious problems such as information loss and color edges can occur. If a weighted interpolation rendering mode is adopted, the problem of low conversion speed in pixel-by-pixel processing exists; if the weighting factors are fixed, the problems such as blurring of the image edges can be caused without considering the image texture information. These problems all result in the inability to display the RGB image properly. Therefore, the sub-pixels need to be rendered to determine the gray scale value of each sub-pixel on the panel, and the processed image is displayed on the panel by the driving circuit.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a sub-pixel rendering method and a sub-pixel rendering system of an RGBG type display panel, aiming at the problems that the display panel arranged in an RGBG structure in the prior art is easy to cause image information loss and image edge blurring so as to influence display quality.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
in a first aspect, the present invention provides a sub-pixel rendering method of an RGBG type display panel, the method comprising:
establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of the target image on an RGBG type display panel;
calculating a weight factor in the interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel;
and according to the weight factors, weighting and calculating the target sub-pixel value of each target image sub-pixel in each target pixel through the interpolation algorithm formula.
In a preferred embodiment of the present application, in an interpolation algorithm formula for establishing a target subpixel value of a target image subpixel in a target pixel according to a mapping relationship between a source pixel of a source image and the target pixel of the target image on an RGBG type display panel, the method specifically includes:
Acquiring a source image and a target image of an RGBG type display panel, wherein the source image comprises a plurality of source pixels, each source pixel comprises source image sub-pixels of red, green and blue 3 color channels, the target image comprises a plurality of target pixels, and each target pixel comprises target image sub-pixels of red, green 2 color channels or blue, green 2 color channels;
a rendering unit is established, a source image window is selected from the source image and a target image window is selected from the target image, the source image window comprises 4 multiplied by 2 source pixels, and the target image window comprises 4 multiplied by 2 target pixels;
establishing a mapping relation between the source pixel and the target pixel according to the quantity ratio of the source pixel to the target pixel in the rendering unit;
and establishing an interpolation algorithm formula in a sub-pixel borrowing mode based on the mapping relation.
In a preferred embodiment of the present application, establishing an interpolation algorithm formula in a subpixel borrowing manner based on the mapping relationship specifically includes:
based on the mapping relation, obtaining the mapping coordinate and the target sub-pixel value expression of the target pixel in a direct mapping mode according to the original coordinate and the original sub-pixel value expression of the source pixel;
Determining target image sub-pixels to be borrowed by each target pixel according to a sub-pixel borrowing mode aiming at even lines and odd lines of the target image window based on the original sub-pixel value expression and the target sub-pixel value expression;
and establishing an interpolation algorithm formula for rendering the source image sub-pixel to the target image sub-pixel according to the source image sub-pixel, the target image sub-pixel and the borrowed target image sub-pixel aiming at the red, green and blue 3 color channels.
In a preferred embodiment of the present application, there are first, second, third and fourth target pixels in order in the horizontal right direction of the even-numbered rows of the target image window, the first target pixel including a first blue target image sub-pixel B 2i-1,2j And a first green target image subpixel G 2i-1,2j The second target pixel comprises a first red target image sub-pixel R 2i,2j And a second green target image subpixel G 2i,2j The third target pixel comprises a second blue target image sub-pixel B 2i+1,2j And a third green target image subpixel G 2i+1,2j The fourth target pixel comprises a second red target image sub-pixel R 2i+2,2j And a fourth green target image subpixel G 2i+2,2j ；
A fifth target pixel, a sixth target pixel, a seventh target pixel and an eighth target pixel are sequentially arranged in the horizontal right direction of the odd-numbered lines of the target image window, wherein the fifth target pixel comprises a third red target image sub-pixel R 2i-1,2j+1 And a fifth green target image subpixel G 2i-1,2j+1 The sixth target pixel comprises a third blue target image sub-pixel B 2i,2j+1 And a sixth green target image subpixel G 2i,2j+1 The seventh target pixel includes a fourth red target image subpixel R 2i+1,2j+1 And a seventh green target image subpixel G 2i+1,2j+1 The eighth target pixel comprises a fourth blue target image sub-pixel B 2i+2,2j+1 And an eighth green target image subpixel G 2i+2,2j+1 ；
Based on a sub-pixel borrowing mode, the first target pixel borrows a first red target image sub-pixel R 2i,2j The second target pixel borrows the second blue target image sub-pixel B 2i+1,2j The third target pixel borrows the second red target image sub-imageElement R 2i+2,2j The fifth target pixel borrows the third blue target image sub-pixel B 2i,2j+1 The sixth target pixel borrows the fourth red target image sub-pixel R 2i+1,2j+1 The seventh target pixel borrows the fourth blue target image sub-pixel B 2i+2,2j+1 。
In a preferred embodiment of the present application, in the interpolation algorithm formula, the even-numbered lines of the target image window correspond to a first conversion formula, and the odd-numbered lines of the target image window correspond to a second conversion formula.
In a preferred embodiment of the present application, the calculating the weight factor in the interpolation algorithm formula based on the gray value of each source pixel by determining the magnitude relation between the gray value deviation between two adjacent source pixels and the preset threshold condition specifically includes:
acquiring original sub-pixel values of source image sub-pixels of 3 color channels in each source pixel;
obtaining gray values of all source pixels according to the original sub-pixel values of the source image sub-pixels of the 3 color channels;
respectively calculating gray value deviation between every two adjacent source pixels in the same odd-numbered row or even-numbered row according to the gray value of each source pixel;
judging the magnitude relation between the gray value deviation and the upper limit value and the lower limit value of a preset threshold value condition;
when the gray value deviation is larger than the upper limit value or smaller than the lower limit value, a weight factor in the interpolation calculation formula is assigned to be 1;
And when the gray value deviation is not more than the upper limit value and not less than the lower limit value, calculating a weight factor in the interpolation calculation formula according to the position relation between the target image sub-pixel and the corresponding source pixel.
In a preferred embodiment of the present application, the calculating the weight factor in the interpolation calculation formula according to the positional relationship between the target image sub-pixel and the corresponding source pixel specifically includes:
determining two adjacent source pixels for interpolating a target subpixel value of a target image subpixel by the interpolation algorithm formula based on the mapping relation;
respectively acquiring a target image sub-pixel center of the target image sub-pixel, and a source pixel center and a source pixel side length of two adjacent corresponding source pixels;
based on the side lengths of the source pixels, respectively calculating the distances between the centers of the target image sub-pixels and the centers of the two source pixels to obtain a first distance and a second distance;
and calculating a weight factor in the interpolation calculation formula according to the first distance and the second distance.
In a second aspect, the present invention provides a sub-pixel rendering system of an RGBG type display panel, the system including a mapping module, a first computing module, and a second computing module connected to each other;
The mapping module is used for establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of the target image on the RGBG type display panel;
the first calculation module is used for calculating a weight factor in the interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel;
and the second calculation module is used for calculating the target sub-pixel value of each target image sub-pixel in each target pixel in a weighting manner through the interpolation algorithm formula according to the weight factors.
In a third aspect, the present invention provides a computer-readable storage medium having stored therein a computer program which, when run on a computer, causes the computer to perform the sub-pixel rendering method of an RGBG type display panel as described in the first aspect.
In a fourth aspect, the present invention provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the sub-pixel rendering method of an RGBG type display panel as described in the first aspect.
The sub-pixel rendering method and the sub-pixel rendering system of the RGBG display panel can reduce the image information loss before and after sub-pixel rendering, eliminate the color edge effect, reduce the edge blurring and simultaneously improve the conversion speed.
Drawings
The invention is described with the aid of the following figures:
fig. 1 is a flowchart of a sub-pixel rendering method of an RGBG type display panel of embodiment 1 of the present invention;
fig. 2 is a flowchart of Step100 in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 3 is a schematic view of a source image in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a target image in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 5 is a schematic diagram of a mapping relationship between a source pixel and a target pixel in a sub-pixel rendering method of an RGBG type display panel of embodiment 1 of the present invention;
fig. 6 is a flowchart of Step140 in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 7 is a schematic diagram of sub-pixel borrowing in a target image window in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
Fig. 8 is a flowchart of Step200 in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 9 is a schematic diagram of two adjacent target pixels in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 10 is a flowchart of Step300 in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 11 is a schematic diagram showing the calculation of the weight factor by the positional relationship in Step300 in the sub-pixel rendering method of the RGBG type display panel of embodiment 1 of the present invention;
fig. 12 is a schematic diagram of a sub-pixel rendering system of an RGBG type display panel of embodiment 2 of the present invention.
Reference numerals:
a 10-rendering unit; 11-source image; 12-source pixels; 13-target image; 14-target pixels; 15-target image subpixels; 16-source image subpixels; 17-a source image window; 18-a target image window; a 20-mapping module; 30-a first computing module; 40-a second calculation module; r-red channel; g-green channel; b-blue channel.
Detailed Description
For a better understanding of the technical solutions of the present application, embodiments of the present application are described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
The embodiment 1 of the invention discloses a sub-pixel rendering method of an RGBG type display panel, which is used for aiming at that a single pixel unit in an AMOLED display panel with an RGBG structure is only composed of two sub-pixels and cannot normally display RGB images, and the image display quality of the AMOLED display panel is improved by analyzing the arrangement structural characteristics of RGBG and rendering the sub-pixels to improve the blurring effect of the image edges.
Referring to fig. 1, the sub-pixel rendering method of the present embodiment 1 includes:
step100: establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of the target image on the RGBG type display panel;
step200: calculating a weight factor in an interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel;
step300: and weighting and calculating the target sub-pixel value of each target image sub-pixel in each target pixel through an interpolation algorithm formula according to the weight factors.
Specifically, in the process of executing steps 100 to 300, the total number of pixels of the source image 11 and the target image 13 is the same, and since the target image 13 is arranged in the RGBG manner, each target pixel 14 in the target image 13 is reduced by 1 color channel of the target image sub-pixel 15 compared to the source pixel 12, and the total number of the target image sub-pixels 15 is also reduced by 1/3 compared to the source image sub-pixel 16, but the total number of the target pixels 14 is the same as the total number of the source pixels 12. Here, the target pixel 14 is not an actual pixel serving as a display on the target image 13, but the target image sub-pixels 15 of the sequentially arranged red, green, and blue 3 color channels R, G, B are artificially divided together, thereby forming one complete target pixel 14. The manner of pixel division is the same in both the source image 11 and the target image 13. Since the number of the source pixels 12 is the same as that of the target pixels 14, a one-to-one correspondence relationship can be formed, and the correspondence relationship is used as a mapping relationship between the source pixels 12 and the target pixels 14, so that the coordinates of the source pixels 12 are mapped to the target pixels 14, and a corresponding sub-pixel value expression is formed. By means of the mapping relationship, the mathematical relationship between the target image sub-pixel 15 of the target pixel 14 in the target image 13 and the source image sub-pixel 16 of the source pixel 12 in the source image 11 is an interpolation algorithm formula to calculate the target sub-pixel value of the target image sub-pixel 15 of the red channel R or the blue channel B missing in each target pixel 14. Since there are often brightness values and color deviations between the target image 13 and the source image 11, a jump occurs between two adjacent target pixels 14, resulting in an edge blurring phenomenon of the target image 13. Since the target subpixel values of the target image subpixels 15 of the target pixels 14 in the target image 13 are obtained by interpolation calculation by the source image subpixels 16 of the source pixels 12, it is necessary to reduce or even eliminate the edge blurring phenomenon by determining whether the gray value deviation between the adjacent two source pixels 12 reaches the preset threshold condition, setting a suitable weighting factor in the area where the jump exists, and setting a suitable weighting factor for the source image subpixels 16 of the adjacent two source pixels 12 for interpolation calculation of the target subpixel values of the target image subpixels 15 of the target pixels 14 in the area where the jump does not exist. Finally, the weighting factors are substituted into an interpolation algorithm formula to obtain the target sub-pixel values of the target image sub-pixels 15 of the red channel R or the blue channel B borrowed by each target pixel 14.
Referring to fig. 2, in the subpixel rendering method of embodiment 1, step100 specifically includes:
step110: a source image and a target image of an RGBG type display panel are acquired.
Step120: and establishing a rendering unit, respectively selecting a source image window from the source image and a target image window from the target image, wherein the source image window comprises 4 multiplied by 2 source pixels, and the target image window comprises 4 multiplied by 2 target pixels.
Step130: and establishing a mapping relation between the source pixel and the target pixel according to the quantity ratio of the source pixel and the target pixel in the rendering unit.
Step140: based on the mapping relation, an interpolation algorithm formula is established in a sub-pixel borrowing mode.
Specifically, the sub-pixel rendering method of the present embodiment 1 renders the image information of the source image 11 into the target image 13 by means of sub-pixel rendering for the RGBG type display panel, as shown in fig. 3 and 4, the source image 11 includes a plurality of source pixels 12, each source pixel 12 includes a source image sub-pixel 16 of red, green, and blue 3 color channels R, G, B, the target image 13 includes a plurality of target pixels 14, and each target pixel 14 includes a target image sub-pixel 15 of red, green, 2 color channels R, G, or cyan, 2 color channels B, G. In the concrete flow of Step100, sub-pixel rendering is performed stepwise by dividing the source image 11 and the target image 13 into a plurality of areas, which are the rendering units 10, by selecting a plurality of source pixels 12 in the source image 11 and a plurality of target pixels 14 in the target image 13, a source image window 17 and a target image window 18 having the same size are created as minimum units of sub-pixel rendering, and in the RGBG type display panel, the number of target pixels 14 included in the target image 13 is the same as the number of source pixels 12 included in the source image 11 by the same target image sub-pixels 15 of a single target pixel 14 as the source image sub-pixels 16 of a single source pixel 12, as shown in fig. 3 and 4, the source image window 17 includes 4×2 source pixels 12, and the target image window 18 includes 4×2 target pixels 14. Since the number of source pixels 12 is the same as the number of target pixels 14, the original coordinates of the source pixels 12 may be directly mapped to the target pixels 14 as the mapped coordinates of the target pixels 14. Referring to fig. 5, the source pixels 12 on the even-numbered row 2j and the odd-numbered row 2j+1 are mapped to the target pixels 14 on the even-numbered row 2j and the odd-numbered row 2j+1, respectively, on the same even-numbered row 2j or the odd-numbered row 2j+1, 4 source pixels 12 are in the source image window 17, 4 target pixels 14 are in the target image window 18, the mapping relationship between the source pixels 12 and the target pixels 14 is a direct mapping relationship, and the original coordinates of the source pixels 12 are the mapping coordinates of the target pixels 14. Based on the original coordinates (2 i-1,2 j), (2 i,2 j), (2i+1, 2 j), (2i+2, 2 j), (2 i-1, 2j+1), (2i, 2j+1), (2i+1, 2j+1), (2i+2, 2j+1) of the 8 source pixels 12 in the source image window 17, the mapped coordinates (2 i-1,2 j), (2i, 2j), (2i+1, 2 j), (2i+2, 2j), (2i-1, 2j+1), (2i, 2j+1), (2i+1, 2j+1), (2i+2, 2j+1) of the 8 target pixels 14 in the target image window 18 can be obtained by a direct mapping relationship. In contrast to fig. 3 and fig. 4, in the rendering unit 10, although the number of the target pixels 14 included in the target image window 18 is the same as the number of the source pixels 12 included in the source image window 17, each target pixel 14 includes only 2 target image sub-pixels 15, and each source pixel 12 includes 3 source image sub-pixels 16, and each target pixel 14 lacks 1 color channel, so that the target image sub-pixels 15 corresponding to the adjacent source pixels 12 need to be borrowed to form a complete pixel, the target image sub-pixels 15 of the blue channel B need to be borrowed when the target image sub-pixels 15 of the red and green 2 color channels R and G are only needed when the target image sub-pixels 15 of the blue and green 2 color channels B and G are only needed, and the target image sub-pixels 15 of the red channel R are used when the target image sub-pixels 15 of the red channel R are used in the above sub-pixel mode, and the positions of the 3 color channels R, G and B corresponding to the source pixels 12 in the target image window 18 are complemented, so that the target image information of the target image window 18 is complemented; the borrowed target sub-pixel value of the target image sub-pixel 15 is calculated from the source pixel 12 corresponding to the position of the borrowed target image sub-pixel 15 and the original sub-pixel value of the source pixel 12 corresponding to the target image sub-pixel 15 according to the red, green and blue 3 color channels R, G and B respectively through an interpolation algorithm formula, each original sub-pixel value is weighted in the interpolation algorithm formula, and corresponding weighting factors are set for the target sub-pixel values of the red, green and blue 3 color channels R, G and B. And establishing an interpolation algorithm formula for calculating a weight factor corresponding to the target subpixel value of each color channel through steps 110 to 140.
Referring to fig. 6, in the subpixel rendering method of the present embodiment 1, step140 specifically includes:
step141: based on the mapping relation, the mapping coordinate and the target sub-pixel value expression of the target pixel are obtained in a direct mapping mode according to the original coordinate and the original sub-pixel value expression of the source pixel.
Step142: and determining target image sub-pixels to be borrowed by each target pixel according to a sub-pixel borrowing mode aiming at even lines and odd lines of a target image window based on the original sub-pixel value expression and the target sub-pixel value expression.
Step143: for the red, green and blue 3 color channels, an interpolation algorithm formula for rendering the source image sub-pixel to the target image sub-pixel is established according to the source image sub-pixel, the target image sub-pixel and the borrowed target image sub-pixel.
Specifically, based on the mapping coordinates of each target pixel 14 obtained in steps Step110 to Step140, the target subpixel value expressions corresponding to the target subpixel values of the target image subpixels 15 of the red channel R, the green channel G, and the blue channel B in each target pixel 14 can be obtained. As shown in fig. 5 and 7, in one source image window 17, 8 source pixels P 2i-1,2j 、P 2i,2j 、P 2i+1,2j 、P 2i+2,2j 、P 2i-1,2j+1 、P 2i,2j+1 、P 2i+1,2j+1 、P 2i+2,2j+1 Corresponding original The sub-pixel values are expressed as (R 2i-1,2j 、G 2i-1,2j 、B 2i-1,2j )、(R 2i,2j 、G 2i,2j 、B 2i,2j )、(R 2i+1,2j 、G 2i+1,2j 、B 2i+1,2j )、(R 2i+2,2j 、G 2i+2,2j 、B 2i+2,2j )、(R 2i-1,2j+1 、G 2i-1,2j+1 、B 2i-1,2j+1 )、(R 2i,2j+1 、G 2i,2j+1 、B 2i,2j+1 )、(R 2i+1,2j+1 、G 2i+1,2j+1 、B 2i+1,2j+1 )、(R 2i+2,2j+1 、G 2i+2,2j+1 、B 2i+2,2j+1 ) The method comprises the steps of carrying out a first treatment on the surface of the In one target image window 18, 8 target pixels P' 2i-1,2j 、P' 2i,2j 、P' 2i+1,2j 、P' 2i+2,2j 、P' 2i-1,2j+1 、P' 2i,2j+1 、P' 2i+1,2j+1 、P' 2i+2,2j+1 The corresponding target sub-pixel values are expressed as (B 'respectively' 2i-1,2j 、G' 2i-1,2j )、(R' 2i,2j 、G' 2i,2j )、(B' 2i+1,2j 、G' 2i+1,2j )、(R' 2i+2,2j 、G' 2i+2,2j )、(R' 2i-1,2j+1 、G' 2i-1,2j+1 )、(B' 2i,2j+1 、G' 2i,2j+1 )、(R' 2i+1,2j+1 、G' 2i+1,2j+1 )、(B' 2i+2,2j+1 、G' 2i+2,2j+1 ). In fig. 7, there are first target pixels P 'in order in the horizontal right direction of the even lines of the target image window 18' 2i-1,2j Second target pixel P' 2i,2j Third target pixel P' 2i+1,2j And a fourth target pixel P' 2i+2,2j First target pixel P' 2i-1,2j Comprising a first blue target image sub-pixel B' 2i-1,2j And a first green target image subpixel G' 2i-1,2j Second target pixel P' 2i,2j Comprising a first red target image subpixel R' 2i,2j And a second green target image subpixel G' 2i,2j Third target pixel P' 2i+1,2j Comprising a second blue target image sub-pixel B' 2i+1,2j And a third green target image subpixel G' 2i+1,2j Fourth target pixel P' 2i+2,2j Comprising a second red target image subpixel R' 2i+2,2j And a fourth green target image subpixel G' 2i+2,2j The method comprises the steps of carrying out a first treatment on the surface of the Having fifth target pixels P 'in order in the horizontal right direction of the odd-numbered rows of the target image window 18' 2i-1,2j+1 Sixth target pixel P' 2i,2j+1 Seventh target pixel P' 2i+1,2j+1 And an eighth target pixel P' 2i+2,2j+1 Fifth target pixel P' 2i-1,2j+1 Comprising a third red target image subpixel R' 2i-1,2j+1 And a fifth green target image subpixel G' 2i-1,2j+1 Sixth target pixel P' 2i,2j+1 Comprising a third blue target image subpixel B' 2i,2j+1 And a sixth green target image subpixel G' 2i,2j+1 Seventh target pixel P' 2i+1,2j+1 Comprising a fourth red target image subpixel R' 2i+1,2j+1 And a seventh green target image subpixel G' 2i+1,2j+1 Eighth target pixel P' 2i+2,2j+1 Comprising a fourth blue target image subpixel B' 2i+2,2j+1 And an eighth green target image subpixel G' 2i+2,2j+1 The method comprises the steps of carrying out a first treatment on the surface of the Based on sub-pixel borrowing mode, a first target pixel P' 2i-1,2j Borrowing the first red target image subpixel R' 2i,2j Second target pixel P' 2i,2j Borrow the second blue target image subpixel B' 2i+1,2j Third target pixel P' 2i+1,2j Borrowing a second red target image subpixel R' 2i+2,2j Fifth target pixel P' 2i-1,2j+1 Borrow third blue target image subpixel B' 2i,2j+1 Sixth target pixel P' 2i,2j+1 Borrowing a fourth red target image subpixel R' 2i+1,2j+1 Seventh target pixel P' 2i+1,2j+1 Borrow fourth blue target image subpixel B' 2i+2,2j+1 . The 6 target image sub-pixels 15 to be interpolated according to the borrowing relation are required to be weighted and calculated through the original sub-pixel values of the source image sub-pixels 16 in the source pixels 12 corresponding to the source image 11 and the adjacent source pixels 12 together with the weight factors, so as to establish an interpolation algorithm formula. The interpolation algorithm formula includes a first conversion formula and a second conversion formula, the even lines of the target image window 18 correspond to the first conversion formula, and the odd lines of the target image window 18 correspond to the second conversion formula The formula is converted.
Wherein, the first conversion formula is:
Figure BDA0003938561760000141
the second conversion formula is:
Figure BDA0003938561760000142
factor in first conversion formula and second conversion formula R Weighting factor, corresponding to source image subpixel 16 for red channel R B A weight factor corresponding to the source image subpixel 16 for blue channel B. Through steps Step141 to Step143, an interpolation algorithm formula with a weight factor is established, and the value of the weight factor can be substituted into the interpolation algorithm formula to calculate the target subpixel value of the target image subpixel 15, and further calculate the gray value of the target pixel 14.
Referring to fig. 8, in the subpixel rendering method of the present embodiment 1, step200 specifically includes:
step210: acquiring original sub-pixel values of source image sub-pixels of 3 color channels in each source pixel;
step220: obtaining gray values of all source pixels according to original sub-pixel values of source image sub-pixels of 3 color channels;
step230: respectively calculating gray value deviation between every two adjacent source pixels in the same odd line or even line according to the gray value of each source pixel;
step240: judging the magnitude relation between the gray value deviation and the upper limit value and the lower limit value of a preset threshold value condition; when the gray value deviation is greater than the upper limit value or less than the lower limit value, executing Step250; when the gray value deviation is not greater than the upper limit value and not less than the lower limit value, executing Step260;
Step250: the weight factor in the interpolation calculation formula is assigned to be 1;
step260: and calculating a weight factor in an interpolation calculation formula according to the position relation between the target image sub-pixel and the corresponding source pixel.
Specifically, since there is a case where sub-pixels borrow only between two adjacent target pixels 14 in the horizontal direction during sub-pixel rendering, the gray value deviation between two adjacent source pixels 12 located in the same line directly affects the color deviation between the display picture and the original picture and the luminance value of the display picture information. Therefore, it is necessary to determine whether the gray value deviation between two adjacent source pixels 12 located in the same row meets the preset threshold condition, so as to determine the position where the jump occurs, and thus, for the weight factors corresponding to the two source pixels 12 corresponding to the position where the jump occurs, to eliminate the blurring problem caused by directly performing interpolation calculation on the two adjacent source pixels 12. The preset threshold condition is used for determining the weight factor, if one condition of the preset threshold conditions is met, the weight factor is calculated through the position relation, and if the other condition of the preset threshold condition is met, the weight factor is directly assigned. The gray value of the source pixel 12 is calculated by a gray value formula: gray_p=0.299×r+0.578×g+0.114×b. Referring to the interpolation formula and fig. 7, the target subpixel value R 'of the red color channel R in the second target image subpixel 15 located in the even-numbered row' 2i,2j By the original subpixel value R of the red channel R in the corresponding source image subpixel 13 2i,2j And the original subpixel value R of the red color channel R in the adjacent source image subpixel 13 2i-1,2j Interpolation calculation is carried out to obtain; target subpixel value B 'for blue channel B in the third target image subpixel 15 in the even row' 2i+1,2j By the original subpixel value B of the blue channel B in the corresponding source image subpixel 13 2i+1,2j And the original subpixel value B of blue channel B in the adjacent source image subpixel 13 2i,2j Interpolation calculation is carried out to obtain; target subpixel value B 'for blue channel B in the second target image subpixel 15 in the odd line' 2i,2j+1 By the original subpixel value B of the blue channel B in the corresponding source image subpixel 13 2i,2j+1 And the original subpixel value B of blue channel B in the adjacent source image subpixel 13 2i-1,2j+1 Interpolation calculation is carried out to obtain; the target subpixel value R 'of the red color channel R in the third target image subpixel 15 in the odd-numbered row' 2i+1,2j+1 By the original subpixel value R of the red channel R in the corresponding source image subpixel 13 2i+1,2j+1 And the original subpixel value R of the red color channel R in the adjacent source image subpixel 13 2i,2j+1 Interpolation calculation. Taking any pair of two source pixels a and b adjacent in the horizontal direction in the source image window 17 shown in fig. 3 as an example, as shown in fig. 9, the gray value of the source pixel a is gray_a, the gray value of the source pixel b is gray_b, the gray value deviation of the source pixel a and the source pixel b is abs (gray_a-gray_b), and the gray value deviation represents only the brightness variation degree between the two adjacent source pixels a and b, so the gray value deviation takes an absolute value to be kept as a positive number. The preset threshold condition includes an upper limit value th up And lower limit value th low Upper limit th up And lower limit value th low Can be set according to actual requirements, such as setting an upper limit value th up =230, lower limit th low =20. The gray value deviation exceeds the upper limit th up Indicating that the black-and-white change or the brightness change between the adjacent two source pixels a and b is relatively large, forming a region with larger brightness deviation in the display image, and performing interpolation calculation between the adjacent two source pixels a and b can cause the problem of edge blurring, wherein the weighting factor is directly applied to R And factor(s) B By assigning values, i.e. when abs (grayA-grayB) > th up In the process, factor R ＝factor B =1.0. The gray value deviation is lower than the lower limit value th low Representing that the black-and-white change or the brightness change between the adjacent two source pixels a and b is smaller, the image is smoother, a region with smaller brightness deviation is formed in the display image, the image information loss is not caused even if interpolation calculation is not carried out between the adjacent two source pixels a and b, most of the region of the display image is a smooth region, the sub-pixel rendering speed can be improved to a certain extent, and the weighting factor is directly applied to the region R And factor(s) B By assigning values, i.e. when abs (grad_a-grad_b) < th low In the process, factor R ＝factor B =1.0. And the gray value deviation is between the upper limit value th up And lower limit value th low If the interpolation is performed, the black-and-white change or brightness change exists between the adjacent two source pixels a and b, but the interpolation calculation does not cause edge blurring, and the interpolation calculation does not cause information loss, and the weighting factor is not used R And factor(s) B The gray values of the source pixels a and b are directly assigned, but are interpolated by the values of the weight factors calculated by the positional relationship.
Referring to fig. 10, in the subpixel rendering method of embodiment 1, step260 specifically includes:
step261: based on the mapping relationship, two adjacent source pixels for interpolating the target image sub-pixels by the interpolation algorithm formula are determined.
Step262: and respectively acquiring the target image sub-pixel center of the target image sub-pixel, and the source pixel center and the source pixel side length of the corresponding adjacent two source pixels.
Step263: and respectively calculating the distances between the centers of the target image sub-pixels and the centers of the two source pixels based on the side lengths of the source pixels to obtain a first distance and a second distance.
Step264: and calculating a weight factor in an interpolation calculation formula according to the first distance and the second distance.
Specifically, the sub-pixel rendering method of the present embodiment 1 uses the positional relationship between the target image sub-pixel 15 and the source pixel 12 to calculate the weight factor in the interpolation algorithm formula. As shown in FIG. 11, the black dots represent the source pixel center O 1 The white dots represent the target image subpixel center O 2 L represents the source pixel side length of a single source pixel 12, denoted as the first target pixel P' 2i-1,2j Borrowing the second target pixel P' 2i,2j First red target image subpixel R' 2i,2j For example, a first target pixel P' 2i-1,2j Corresponding to source pixel P 2i-1,2j Second target pixel P' 2i,2j Corresponding to source pixel P 2i,2j First red target image subpixel R' 2i,2j Target image subpixel center O of (2) 2 And source pixel P 2i,2j Source pixel center O of (2) 1 With a first distance L1 therebetween, a firstDistance L1 is 1/4L, the first red target image subpixel R' 2i,2j Target image subpixel center O of (2) 2 And source pixel P 2i-1,2j Source pixel center O of (2) 1 A second distance L2 is arranged between the two parts, the second distance L2 is 3/4L, and a weight factor is set according to the first distance L1 and the second distance L2 R And factor(s) B Is of a size to obtain a factor R ＝factor B =0.75. Through steps 261 to Step264, the weight factor is set according to the positional relationship between the target image sub-pixel 15 and the adjacent two source pixels 12, and when the gray value deviation between the adjacent two source pixels 12 is not large, the gray values of the two source pixels 12 are directly assigned without calculation, so that the conversion speed of sub-pixel rendering can be improved. According to the sub-pixel rendering method in the embodiment 1, sub-pixel rendering is performed based on weights through the step flow, so that the edge color edge effect of a display image is improved, the image information loss is reduced, information judgment of gray value deviation is introduced, the edge blurring phenomenon of the display image is reduced, and meanwhile, the sub-pixel rendering speed is improved.
Example 2
The embodiment 2 of the invention discloses a sub-pixel rendering system of an RGBG type display panel, which is used for only forming a single pixel unit by two sub-pixels in an AMOLED display panel with an RGBG structure according to the sub-pixel rendering method of the RGBG type display panel disclosed in the embodiment 1, so that an RGB image can not be normally displayed, and the image display quality of the AMOLED display panel is improved by analyzing the arrangement structural characteristics of the RGBG and rendering the sub-pixels to improve the blurring effect of the image edge.
Referring to fig. 12, the sub-pixel rendering system of the present embodiment 2 includes a mapping module 20, a first calculating module 30, and a second calculating module 40 connected to each other; the mapping module 20 is configured to establish an interpolation algorithm formula of a target subpixel value of a target image subpixel in a target pixel according to a mapping relationship between a source pixel of a source image and the target pixel of the target image on the RGBG type display panel; the first calculating module 30 is configured to calculate a weight factor in the interpolation algorithm formula by determining a magnitude relation between a gray value deviation between two adjacent source pixels and a preset threshold condition based on a gray value of each source pixel; the second calculating module 40 is configured to calculate the target subpixel value of each target image subpixel in each target pixel by weighting through an interpolation algorithm formula according to the weight factor.
Specifically, in the subpixel rendering system of embodiment 2, the total number of pixels of the source image and the target image is the same, and since the target images are arranged in the RGBG manner, each target pixel in the target image is 1 color channel less than the source pixel and the target image subpixels, and the total number of target image subpixels is also 1/3 less than the source image subpixels, but the total number of target pixels is the same as the total number of source pixels. Here, the target pixel is not an actual pixel used as a display on the target image, but target image sub-pixels of the sequentially arranged red, green, and blue 3 color channels R, G, and B are artificially divided together, thereby forming one complete target pixel. The manner of pixel division is the same in both the source image and the target image. Since the number of the source pixels is the same as that of the target pixels, a one-to-one correspondence relationship can be formed, and the mapping module 20 is used for mapping the coordinates of the source pixels to the target pixels to form a corresponding sub-pixel value expression. Through the mapping relation, a mathematical relation is established between the target image sub-pixels of the target pixels in the target image and the source image sub-pixels of the source pixels in the source image, which is an interpolation algorithm formula, so as to calculate the target sub-pixel values of the target image sub-pixels of the red channel R or the blue channel B which are absent in each target pixel respectively. Because brightness value and color deviation often exist between the target image and the source image, jump occurs between two adjacent target pixels, and the edge blurring phenomenon of the target image is caused. Since the target subpixel values of the target image subpixels of the target pixels in the target image are obtained by interpolation calculation of the source image subpixels in the source pixels, the first calculation module 30 reduces or even eliminates the edge blurring phenomenon by determining whether the gray value deviation between two adjacent source pixels reaches the preset threshold condition, and sets an appropriate weight factor for the source image subpixels of two adjacent source pixels for interpolation calculation of the target subpixel values of the target image subpixels in the target pixels in the non-presence region of the transition. And finally, substituting the weight factors into an interpolation algorithm formula through a second calculation module to obtain target sub-pixel values of the target image sub-pixels of the red channel R or the blue channel B borrowed from each target pixel.
Example 3
Embodiment 3 of the present invention discloses a computer-readable storage medium in which a computer program is stored which, when run on a computer, causes the computer to perform a sub-pixel rendering method of an RGBG type display panel as disclosed in embodiment 1.
Example 4
Embodiment 4 of the present invention discloses a computer program product comprising a computer program which, when run on a computer, causes the computer to perform a sub-pixel rendering method of an RGBG type display panel as disclosed in embodiment 1.
The sub-pixel rendering method and the sub-pixel rendering system of the RGBG display panel can reduce the image information loss before and after sub-pixel rendering, eliminate the color edge effect, reduce the edge blurring and simultaneously improve the conversion speed.
It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and is for enabling those skilled in the art to understand the present invention and implement it accordingly, but the present invention is not limited to the above-described specific embodiments. All changes or modifications that come within the scope of the appended claims are intended to be embraced therein.

Claims (10)

1. A sub-pixel rendering method of an RGBG type display panel, the method comprising: establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of the target image on an RGBG type display panel;
calculating a weight factor in the interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel;
and according to the weight factors, weighting and calculating the target sub-pixel value of each target image sub-pixel in each target pixel through the interpolation algorithm formula.
2. The method for rendering sub-pixels of an RGBG type display panel according to claim 1, wherein the creating an interpolation algorithm formula of the target sub-pixel value of the target image sub-pixel in the target pixel according to the mapping relationship between the source pixel of the source image and the target pixel of the target image on the RGBG type display panel specifically comprises:
acquiring a source image and a target image of an RGBG type display panel, wherein the source image comprises a plurality of source pixels, each source pixel comprises source image sub-pixels of red, green and blue 3 color channels, the target image comprises a plurality of target pixels, and each target pixel comprises target image sub-pixels of red, green 2 color channels or blue, green 2 color channels;
A rendering unit is established, a source image window is selected from the source image and a target image window is selected from the target image, the source image window comprises 4 multiplied by 2 source pixels, and the target image window comprises 4 multiplied by 2 target pixels;
establishing a mapping relation between the source pixel and the target pixel according to the quantity ratio of the source pixel to the target pixel in the rendering unit;
and establishing an interpolation algorithm formula in a sub-pixel borrowing mode based on the mapping relation.
3. The method for sub-pixel rendering of an RGBG type display panel according to claim 2, wherein in establishing an interpolation algorithm formula in a sub-pixel borrowing manner based on the mapping relation, specifically comprising: based on the mapping relation, obtaining the mapping coordinate and the target sub-pixel value expression of the target pixel in a direct mapping mode according to the original coordinate and the original sub-pixel value expression of the source pixel;
determining target image sub-pixels to be borrowed by each target pixel according to a sub-pixel borrowing mode aiming at even lines and odd lines of the target image window based on the original sub-pixel value expression and the target sub-pixel value expression;
And establishing an interpolation algorithm formula for rendering the source image sub-pixel to the target image sub-pixel according to the source image sub-pixel, the target image sub-pixel and the borrowed target image sub-pixel aiming at the red, green and blue 3 color channels.
4. The sub-pixel rendering method of an RGBG type display panel of claim 3, wherein there are sequentially in a horizontal right direction of an even-numbered row of the target image window a first target pixel, a second target pixel, a third target pixel, and a fourth target pixel, the first target pixel including a first blue target image sub-pixel B 2i-1,2j And a first green target image subpixel G 2i-1,2j The second target pixel comprises a first red target image sub-pixel R 2i,2j And a second green target image subpixel G 2i,2j The third target pixel comprises a second blue target image sub-pixel B 2i+1,2j And a third green target image subpixel G 2i+1,2j The fourth target pixel comprises a second red target image sub-pixel R 2i+2,2j And a fourth green target image subpixel G 2i+2,2j ；
A fifth target pixel, a sixth target pixel, a seventh target pixel and an eighth target pixel are sequentially arranged in the horizontal right direction of the odd-numbered lines of the target image window, wherein the fifth target pixel comprises a third red target image sub-pixel R 2i-1,2j+1 And a fifth green target image subpixel G 2i-1,2j+1 The sixth target pixel comprises a third blue target image sub-pixel B 2i,2j+1 And a sixth green target image sub-Pixel G 2i,2j+1 The seventh target pixel includes a fourth red target image subpixel R 2i+1,2j+1 And a seventh green target image subpixel G 2i+1,2j+1 The eighth target pixel comprises a fourth blue target image sub-pixel B 2i+2,2j+1 And an eighth green target image subpixel G 2i+2,2j+1 ；
Based on a sub-pixel borrowing mode, the first target pixel borrows a first red target image sub-pixel R 2i,2j The second target pixel borrows the second blue target image sub-pixel B 2i+1,2j The third target pixel borrows the second red target image sub-pixel R 2i+2,2j The fifth target pixel borrows the third blue target image sub-pixel B 2i,2j+1 The sixth target pixel borrows the fourth red target image sub-pixel R 2i+1,2j+1 The seventh target pixel borrows the fourth blue target image sub-pixel B 2i+2,2j+1 。
5. A subpixel rendering method of an RGBG type display panel according to claim 2 or 3, wherein in the interpolation algorithm formula, even lines of the target image window correspond to a first conversion formula, and odd lines of the target image window correspond to a second conversion formula.
6. The method for sub-pixel rendering of an RGBG type display panel according to claim 1, wherein in calculating the weight factor in the interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and the preset threshold condition based on the gray value of each of the source pixels, specifically comprises:
acquiring original sub-pixel values of source image sub-pixels of 3 color channels in each source pixel;
obtaining gray values of all source pixels according to the original sub-pixel values of the source image sub-pixels of the 3 color channels;
respectively calculating gray value deviation between every two adjacent source pixels in the same odd-numbered row or even-numbered row according to the gray value of each source pixel;
judging the magnitude relation between the gray value deviation and the upper limit value and the lower limit value of a preset threshold value condition;
when the gray value deviation is larger than the upper limit value or smaller than the lower limit value, a weight factor in the interpolation calculation formula is assigned to be 1;
and when the gray value deviation is not more than the upper limit value and not less than the lower limit value, calculating a weight factor in the interpolation calculation formula according to the position relation between the target image sub-pixel and the corresponding source pixel.
7. The method for sub-pixel rendering of an RGBG type display panel according to claim 6, wherein in calculating the weight factor in the interpolation calculation formula according to the positional relationship between the target image sub-pixel and the corresponding source pixel, specifically, it comprises:
determining two adjacent source pixels for interpolating the target image sub-pixels through the interpolation algorithm formula based on the mapping relation;
respectively acquiring a target image sub-pixel center of the target image sub-pixel, and a source pixel center and a source pixel side length of two adjacent corresponding source pixels;
based on the side lengths of the source pixels, respectively calculating the distances between the centers of the target image sub-pixels and the centers of the two source pixels to obtain a first distance and a second distance;
and calculating a weight factor in the interpolation calculation formula according to the first distance and the second distance.
8. A sub-pixel rendering system of an RGBG type display panel, wherein the system comprises a mapping module, a first calculating module and a second calculating module which are connected with each other;
the mapping module is used for establishing an interpolation algorithm formula of target sub-pixel values of target image sub-pixels in target pixels according to a mapping relation between source pixels of a source image and target pixels of the target image on the RGBG type display panel;
The first calculation module is used for calculating a weight factor in the interpolation algorithm formula by judging the magnitude relation between the gray value deviation between two adjacent source pixels and a preset threshold value condition based on the gray value of each source pixel;
and the second calculation module is used for calculating the target sub-pixel value of each target image sub-pixel in each target pixel in a weighting manner through the interpolation algorithm formula according to the weight factors.
9. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to perform the sub-pixel rendering method of an RGBG type display panel as claimed in any one of claims 1 to 7.
10. A computer program product, characterized in that the computer program product comprises a computer program which, when run on a computer, causes the computer to perform the sub-pixel rendering method of an RGBG type display panel as claimed in any one of claims 1 to 7.
CN202211411060.3A 2022-11-11 2022-11-11 Sub-pixel rendering method and system of RGBG display panel Pending CN116095398A (en)

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