CN109461400B - Sub-pixel rendering method and device for converting RGB (red, green and blue) image into RGBW (red, green and blue) image - Google Patents

Sub-pixel rendering method and device for converting RGB (red, green and blue) image into RGBW (red, green and blue) image Download PDF

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CN109461400B
CN109461400B CN201811545004.2A CN201811545004A CN109461400B CN 109461400 B CN109461400 B CN 109461400B CN 201811545004 A CN201811545004 A CN 201811545004A CN 109461400 B CN109461400 B CN 109461400B
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刘丽丽
田广
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Hisense Visual Technology Co Ltd
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Abstract

The invention discloses a sub-pixel rendering method and a device for converting RGB (red, green and blue) to RGBW (red, green and blue) images, wherein the sub-pixel rendering method comprises the following steps: generating a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image; determining a most similar sub-pixel of said each sub-pixel; rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel. The rendered color value of each sub-pixel generated by the method takes into account the color value of the previous sub-pixel and the color value of the most similar sub-pixel in the neighborhood, the color correlation of each sub-pixel is increased, the color mutation degree is reduced, the rendering result has higher accuracy, the rendered color value is used for subsequent down-sampling treatment, and the problem of abnormal color points and saw teeth cannot occur in the finally displayed image.

Description

Sub-pixel rendering method and device for converting RGB (red, green and blue) image into RGBW (red, green and blue) image
Technical Field
The invention relates to the technical field of display equipment, in particular to a sub-pixel rendering method and device for converting an RGB (red, green and blue) image into an RGBW (red, green and blue) image.
Background
In the image display of the RGB type liquid crystal panel, each pixel in an image is composed of a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the red sub-pixel, the green sub-pixel, and the blue sub-pixel are respectively formed by filtering a white backlight through a red filter, a green filter, and a blue filter. Thus, since only one third of the white light passes through each sub-pixel unit of the RGB type liquid crystal panel, two thirds of the white light is lost, so that a large power needs to be supplied to ensure sufficient brightness of the RGB type liquid crystal panel.
In order to reduce power consumption while satisfying sufficient luminance of an RGB type liquid crystal panel, an RGBW type liquid crystal panel is generally used for image display. When performing image display using the RGBW-type liquid crystal panel, generally, an R, G, B value of each pixel in an input image is converted into a color value of each sub-pixel of the pixel in the RGBW color gamut, and then the color value is output to the RGBW-type liquid crystal panel, so that image display of the RGBW-type liquid crystal panel is realized. Because each pixel of the RGBW-type liquid crystal panel corresponds to four sub-pixel units, under the condition that the resolution of the RGBW-type liquid crystal panel is the same as that of the RGB-type liquid crystal panel, the size of the RGBW-type liquid crystal panel is larger than that of the RGB-type liquid crystal panel, and if the size of the liquid crystal panel is not increased and the resolution is kept unchanged, downsampling processing needs to be performed on the sub-pixel of each pixel in the RGBW color domain.
In the prior art, the implementation manners of downsampling the sub-pixels of each pixel in the RGBW color domain include a plurality of manners, for example: three-quarter down-sampling at the pixel level, i.e., deleting one of the sub-pixels of each pixel; alternatively, the four sub-pixels of each pixel are compressed into three sub-pixels, and so on. However, these methods often result in image distortion, loss of image detail, and the like.
In order to solve the above problem, the prior art also discloses another method for down-sampling sub-pixels of each pixel in the RGBW color gamut, in which after the R, G, B value of each pixel in the image is converted into the color value of each sub-pixel of the pixel in the RGBW color gamut, the rendering of the sub-pixel of the pixel in the RGBW color gamut reduces the degree of color abrupt change between adjacent pixels after down-sampling, and improves the problems of display distortion and image detail loss. However, through multiple applications of the method, the accuracy of the subpixel rendering result in the method is still low, and in the process of actually applying the method, the problem of abnormal color points and jaggies still occur in the finally displayed image.
Disclosure of Invention
The invention provides a sub-pixel rendering method and device for converting an RGB (red, green and blue) to an RGBW (red, green and blue) image, which are used for solving the problems that the accuracy of a sub-pixel rendering result is low in the conventional RGB to RGBW image conversion, and abnormal color points and saw teeth still occur in a finally displayed image by using the rendering result.
In a first aspect, the present invention provides a sub-pixel rendering method for RGB to RGBW image conversion, the sub-pixel rendering method comprising: generating a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image; determining a most similar sub-pixel of said each sub-pixel; the most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to the neighborhood of the sub-pixel where the sub-pixel is located, and all the sub-pixels in the neighborhood of the sub-pixel correspond to the same color; rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel; the previous sub-pixel of each pixel in the first column is itself, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel in the target neighborhood of the sub-pixel, which is located in the previous column of the sub-pixel and is in the same row as the sub-pixel.
Further, the process of generating the color value of each sub-pixel of each pixel in the RGBW color gamut according to the R, G, B value of each pixel in the input image specifically includes: scaling R, G, B values of each pixel in the input image to generate a scaled R, G, B value for the pixel; generating an initial color value of the white sub-pixel of each pixel in the RGBW color gamut according to the scaled R, G, B value of the pixel; scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut to generate the color value of the white sub-pixel of the pixel in the RGBW color gamut; and generating the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel in the RGBW color gamut according to the color value of the white sub-pixel of the pixel in the RGBW color gamut.
Further, the process of rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel, and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel specifically includes: for a red sub-pixel, a green sub-pixel and a blue sub-pixel, determining the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the largest color value of the color values of the previous sub-pixels of the sub-pixel as the rendered color value of the sub-pixel; for each white sub-pixel, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
Further, the sub-pixel rendering method further comprises: rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to a rule that the adjacent relation of red-green-blue-white-red is the same as the color of the last sub-pixel of the previous pixel and the color of the first sub-pixel of the next pixel of the previous pixel; and after rearrangement, outputting the color values of the first three sub-pixels of the first column of pixels, and the rendered color value of the first sub-pixel and the color values of the second and third sub-pixels of each of the rest pixels.
Further, the target region of each sub-pixel is a 3 × 3 sub-pixel region centered on the sub-pixel.
In a second aspect, the present invention also provides a subpixel rendering apparatus for RGB to RGBW image conversion, the subpixel rendering apparatus comprising: the color value generating module is used for generating a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image; a most similar sub-pixel determining module for determining a most similar sub-pixel of each sub-pixel; the most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to the neighborhood of the sub-pixel where the sub-pixel is located, and all the sub-pixels in the neighborhood of the sub-pixel correspond to the same color; the rendering module is used for rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel; the previous sub-pixel of each pixel in the first column is itself, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel in the target neighborhood of the sub-pixel, which is located in the previous column of the sub-pixel and is in the same row as the sub-pixel.
Further, the color value generation module is specifically configured to: scaling R, G, B values of each pixel in the input image to generate a scaled R, G, B value for the pixel; generating an initial color value of the white sub-pixel of each pixel in the RGBW color gamut according to the scaled R, G, B value of the pixel; scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut to generate the color value of the white sub-pixel of the pixel in the RGBW color gamut; and generating the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel in the RGBW color gamut according to the color value of the white sub-pixel of the pixel in the RGBW color gamut.
Further, the rendering module is specifically configured to: for a red sub-pixel, a green sub-pixel and a blue sub-pixel, determining the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the largest color value of the color values of the previous sub-pixels of the sub-pixel as the rendered color value of the sub-pixel; for each white sub-pixel, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
Further, the subpixel rendering apparatus further includes: a downsampling module specifically configured to: rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to a rule that the adjacent relation of red-green-blue-white-red is the same as the color of the last sub-pixel of the previous pixel and the color of the first sub-pixel of the next pixel of the previous pixel; and after rearrangement, outputting the color values of the first three sub-pixels of the first column of pixels, and the rendered color value of the first sub-pixel and the color values of the second and third sub-pixels of each of the rest pixels.
Further, the target region of each sub-pixel is a 3 × 3 sub-pixel region centered on the sub-pixel.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects: the invention provides a sub-pixel rendering method and device for converting an RGB (red, green and blue) image into an RGBW image. According to the subpixel rendering method, after the color value of each subpixel of the pixel in the RGBW color gamut is generated according to the R, G, B value of each pixel in an input image, the subpixel is rendered according to the color value of each subpixel, the color value of the most similar subpixel of the subpixel and the color value of the previous subpixel of the subpixel, the generated rendered color value of the subpixel combines the color value of the previous subpixel and the color value of the most similar subpixel in the neighborhood, the correlation of the color of each subpixel is increased, the mutation degree of the color is reduced, and the accuracy of the rendering result is higher.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a schematic flowchart of a sub-pixel rendering method for RGB to RGBW image conversion according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating a sub-pixel rendering apparatus for RGB to RGBW image conversion according to an embodiment of the present invention.
Detailed Description
In combination with the background art, in the prior art, in the process of converting an RGB image into an RGBW image, the degree of abrupt color change between adjacent pixels after downsampling the sub-pixels of each pixel in the RGBW color gamut is reduced through rendering the sub-pixels of each pixel in the RGBW color gamut. However, in practical application, the accuracy of subpixel rendering in the method is low, so that after downsampling processing, abnormal color dots and jaggies still appear in an image finally displayed on the RGBW liquid crystal panel. To solve the problem, the invention provides a sub-pixel rendering method and device for converting RGB to RGBW images.
The following describes the sub-pixel rendering method and apparatus for RGB to RGBW image conversion according to the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a sub-pixel rendering method for RGB to RGBW image conversion according to an embodiment of the present invention. As can be seen from fig. 1, the sub-pixel rendering method includes:
step S101, generating a color value of each sub-pixel of each pixel in the RGBW color gamut according to the R, G, B value of each pixel in the input image.
In some optional embodiments, when step S101 is specifically executed, firstly, according to the following formula (1), R, G, B values of each pixel in the input image are scaled, so as to generate a scaled R, G, B value of the pixel, in an embodiment of the present invention, R, G, B values of any one pixel in the input image are respectively and correspondingly recorded as Rin (i, j), Gin (i, j), and Bin (i, j), and scaled R, G, B values of the pixel are respectively and correspondingly recorded as R1(i, j), G1(i, j), and B1(i, j); wherein (i, j) represents the position coordinate of the pixel in the corresponding image, i represents the column number of the pixel, and j represents the row number of the pixel.
Figure BDA0001909124400000041
In formula (1), a, b, and c represent scaling factors, and the values of a, b, and c may be set according to physical characteristics of an actual liquid crystal panel, for example, the values of a, b, and c may all be set to 0.5, etc.; gamma is a conversion factor, and the value of gamma can also be set according to the physical characteristics of the actual liquid crystal panel, for example, the value of gamma can be set to 2.2.
After generating R, G, B scaled values for each pixel using equation (1), the initial color value of the white sub-pixel of the pixel in the RGBW gamut is generated from R, G, B scaled values for the pixel using equation (2) below.
W1(i,j)＝min(R1(i,j),G1(i,j),B1(i,j)) (2)
In formula (2), W1(i, j) represents the initial color value of the white sub-pixel in the RGBW color gamut for the pixel with the position coordinate (i, j); min represents the minimum value, and R1(i, j), G1(i, j), B1(i, j) represent the scaled R, G, B value of the pixel.
It should be noted that other formulas may also be used to generate the initial color value of the white sub-pixel in the RGBW color gamut for each pixel, that is, the above formula (2) may also be set in other forms, for example, W1(i, j) ═ max (R1(i, j), G1(i, j), B1(i, j)), where max represents taking the maximum value; or, W1(i, j) ═ minRGB ^ 2; or, W1(i, j) ═ minRGB ^3+ minRGB ^2+ minRGB; in the foregoing formula, minRGB ^3 represents the shorthand form of min (R1(i, j), G1(i, j), B1(i, j)) ^3, minRGB ^2 represents the shorthand form of min (R1(i, j), G1(i, j), B1(i, j)) ^2, and minRGB represents the shorthand form of min (R1(i, j), G1(i, j), B1(i, j)); of course, the formula (2) can also be set to other forms according to the practical application scenario, and is not listed here.
After generating the initial color value of the white sub-pixel of each pixel in the RGBW color gamut, scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut by using the following formula (3), and generating the color value of the white sub-pixel of the pixel in the RGBW color gamut.
Wout(i,j)＝β*f(W1(i,j)) (3)
In formula (3), Wout (i, j) represents a color value of a white sub-pixel in the RGBW color gamut of a pixel with a position coordinate of (i, j); beta is a white regulatory factor, and the value range of beta is [0,1]]For example, the value of β may be set to 0.5; f is a function of the initial color value W1(i, j) of the white sub-pixel of the pixel in the RGBW color gamut, e.g., the function may be set to f ═ W1(i,j))αThe value of α can be set according to actual needs, for example, the value of α can be set to 1.
After generating the color value of the white sub-pixel of each pixel in the RGBW color gamut, the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of the pixel in the RGBW color gamut are generated according to the color value of the white sub-pixel of the pixel in the RGBW color gamut by using the following formula (4).
Figure BDA0001909124400000061
In formula (4), Rout (i, j) represents the color value of the red sub-pixel in the RGBW color gamut of the pixel with the position coordinate of (i, j); gout (i, j) represents the color value of the green sub-pixel of the pixel in the RGBW color gamut; bout (i, j) represents the color value of the blue sub-pixel of the pixel in the RGBW color gamut; r1(i, j), G1(i, j) and B1(i, j) represent scaled R, G, B values of the pixel, Wout (i, j) represents color values of the white sub-pixel of the pixel in the RGBW gamut; m is an adjustment factor and can be set according to actual needs, for example, M can be set to
Figure BDA0001909124400000062
In other optional embodiments, the R, G, B value of each pixel in the input image may not be scaled, and the color value of each sub-pixel of the pixel in the RGBW color gamut is directly generated according to the R, G, B value of each pixel, specifically, the foregoing implementation may be referred to, and the scaled R, G, B value of each pixel in the above formula (2) is replaced by the R, G, B value of the pixel, and the remaining steps are the same and are not described herein again.
Step S102, determining the most similar sub-pixel of each pixel in the RGBW color gamut.
The most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to a sub-pixel neighborhood where the sub-pixel is located, and all sub-pixels in the sub-pixel neighborhood correspond to the same color. The pixels located at the boundary include a pixel located at the first row, a pixel located at the last row, a pixel located at the first column, and a pixel located at the last column.
In particular, when step S102 is executed, the most similar sub-pixel of each sub-pixel in the RGBW color gamut of each pixel may be determined as follows:
firstly, rearranging all red sub-pixels of all pixels in an RGBW color gamut according to the position coordinates of the corresponding pixels to synthesize a frame of red sub-pixel image; in the same manner, the green sub-pixel image, the blue sub-pixel image, and the white sub-pixel image are synthesized.
In a red sub-pixel image, for each red sub-pixel located at the boundary of the red sub-pixel image, the most similar sub-pixel of the red sub-pixel is the red sub-pixel itself; regarding any one red sub-pixel in the rest red sub-pixels in the red sub-pixel image, the red sub-pixel is marked as a target sub-pixel, and the most similar sub-pixel of the red sub-pixel is determined according to the following modes:
first, in the red subpixel image, a target neighborhood of the target subpixel is determined, and the target neighborhood may be set according to actual needs, for example, the target neighborhood may be determined as a 3 × 3 red subpixel region centered on the target subpixel.
Then, the difference value between the color value of each red sub-pixel except the target sub-pixel and the target sub-pixel in the target neighborhood of the target sub-pixel is calculated.
If the difference value of the color values of a certain red sub-pixel and the target sub-pixel is zero, the most similar sub-pixel of the target sub-pixel is the most similar sub-pixel of the target sub-pixel; or, if there is no difference of zero, the absolute value of the difference is minimized, and the corresponding red sub-pixel is determined as the most similar sub-pixel of the target sub-pixel, and the position coordinates of the most similar sub-pixel of the target sub-pixel in the red sub-pixel image are the same as the position coordinates of the pixel corresponding to the most similar sub-pixel in the corresponding image.
In the same manner, the most similar sub-pixels for each green sub-pixel, each blue sub-pixel, and each white sub-pixel are determined. And will not be described in detail herein.
Step S103, rendering the sub-pixel according to the color value of each sub-pixel of each pixel in the RGBW color gamut, the color value of the most similar sub-pixel of the sub-pixel, and the color value of the previous sub-pixel of the sub-pixel, and generating a rendered color value of the sub-pixel.
The previous sub-pixel of each pixel in the first column is itself, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel in the target neighborhood of the sub-pixel, which is located in the previous column of the sub-pixel and is in the same row as the sub-pixel.
In some optional embodiments, for each red, green and blue sub-pixel of the pixel in the RGBW gamut, the largest color value of the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel, and the color value of the previous sub-pixel of the sub-pixel is determined as the rendered color value of the sub-pixel.
For each white sub-pixel of each pixel in an RGBW color gamut, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
In specific implementation, for a red sub-pixel, a green sub-pixel, and a blue sub-pixel of each pixel in the RGBW color domain, the following formula (5) may be used to render each sub-pixel, and generate a rendered color value of the sub-pixel.
Figure BDA0001909124400000071
In formula (5), Pr (i, j) represents a rendered color value of a red subpixel of a pixel with a position coordinate of (i, j) in the RGBW gamut, Rout (i, j) represents a color value of the red subpixel, Rout (i-1, j) represents a color value of a previous subpixel of the red subpixel, and Rout (s _ Rx, s _ R y) represents a color value of a most similar subpixel of the red subpixel; pg (i, j) represents a rendered color value of a green subpixel of the pixel with a position coordinate of (i, j) in the RGBW gamut, Gout (i, j) represents a color value of the green subpixel, Gout (i-1, j) represents a color value of a previous subpixel of the green subpixel, and Gout (s _ Gx, s _ Gy) represents a color value of a most similar subpixel of the green subpixel; pb (i, j) represents a rendered color value of a blue sub-pixel of the pixel with a position coordinate of (i, j) in the RGBW color gamut, Bout (i, j) represents a color value of the blue sub-pixel, Bout (i-1, j) represents a color value of a previous sub-pixel of the blue sub-pixel, and Bout (s _ Bx, s _ By) represents a color value of a most similar sub-pixel of the blue sub-pixel; max represents taking the maximum value.
For a white sub-pixel of each pixel in an RGBW color domain, if the color value of the white sub-pixel is less than a preset threshold, rendering the white sub-pixel by using the following formula (6) to generate a rendered color value of the white sub-pixel; or, if the color value of the white subpixel is greater than or equal to a preset threshold, rendering the white subpixel by using the following formula (7) to generate a rendered color value of the white subpixel. The preset threshold may be set according to actual scene needs, for example, the preset threshold may be set as: wout (i-1, j)/PW _ Level, where Wout (i-1, j) represents a color value of a previous subpixel of the white subpixel, and PW _ Level is an adjustment coefficient, and a value of the adjustment coefficient PW _ Level may be set according to an actual scene requirement, for example, a value of PW _ Level may be set to 32.
Pw(i,j)＝max(Wout(i,j),Wout(i-1,j),Wout(s_Wx,s_Wy)) (6)
Pw(i,j)＝beta*(c0*Wout(i,j)+c1*Wout(i-1,j)+c2*Wout(s_Wx,s_Wy)) (7)
In the above equation (6) and equation (7), Pw (i, j) represents a rendered color value of the white subpixel in the RGBW gamut of the pixel having the position coordinate (i, j); wout (i, j) represents a color value of the white subpixel; wout (i-1, j) represents the color value of the previous sub-pixel of the white sub-pixel, and Wout (s _ Wx, s _ Wy) represents the color value of the most similar sub-pixel of the white sub-pixel; max represents taking the maximum value; beta, c0, c1 and c2 are all sub-pixel adjustment factors, and c0+ c1+ c2 is 1, and the value range of beta is [0,1 ]. The values of beta, c0, c1 and c2 can be set according to actual scene needs, for example, the values of c0, c1 and c2 can be all set to 1/3, and the value of beta is set to 1.
In other alternative embodiments, each sub-pixel of each pixel in the RGBW color gamut may be rendered in other manners according to the requirements of the actual application scenario, for example, replacing the maximum max in the above formula (5), formula (6), and formula (7) with the minimum min, taking the median mean, taking any one of the mean means, or a combination of a plurality thereof (e.g., a1 mean + a2 mean, where a1+ a2 is 1), etc.; the rest steps are the same and are not described herein again.
In some optional embodiments, after obtaining the rendered color value of each sub-pixel of each pixel in the RGBW color gamut, the sub-pixel rendering method further includes: rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to a rule that the adjacent relation of red-green-blue-white-red is the same as the color of the last sub-pixel of the previous pixel and the color of the first sub-pixel of the next pixel of the previous pixel; and after rearrangement, outputting the color values of the first three sub-pixels of the first column of pixels, and the rendered color value of the first sub-pixel and the color values of the second and third sub-pixels of each of the rest pixels.
For example, the first row of the RGB type liquid crystal panel has four pixel units, and the first row of the corresponding input image has 4 pixels, and the initial arrangement order of the sub-pixels of the 4 pixels in the RGBW color gamut is: rgbwgbwrgbwrgbwrgbw; after the rendered color values of each sub-pixel of the 4 pixels are obtained, the sub-pixels of the 4 pixels are rearranged according to the following sequence: rgbwrggbwr; then, the following are sequentially output to a first line of the RGBW-type liquid crystal panel having the same size as the RGB-type liquid crystal panel: the color values of the red, green and blue sub-pixels of the first pixel, the rendered color value of the white sub-pixel of the second pixel, and the color values of the red and green sub-pixels, the rendered color value of the blue sub-pixel of the third pixel, and the color values of the white and red sub-pixels, and the rendered color value of the green sub-pixel of the fourth pixel, and the color values of the blue and white sub-pixels.
The initial arrangement of the sub-pixels of the pixels in the RGBW color space is the same as the arrangement of the sub-pixel units of the RGBW type liquid crystal panel. In addition to the above arrangement in the RGBW cyclic arrangement, there are other arrangements of the sub-pixel cells of the RGBW type liquid crystal panel, for example, the arrangement in the BWRG cyclic arrangement. In the case where the sub-pixel cells of the RGBW-type liquid crystal panel are arranged in a BWRG cyclic arrangement, a corresponding color value may be output to each sub-pixel cell of the RBGW-type liquid crystal panel with reference to the following case:
for example, the first row of the RGB type liquid crystal panel has four pixel units, and the first row of the corresponding input image has 4 pixels, and the initial arrangement order of the sub-pixels of the 4 pixels in the RGBW color gamut is: BWRGBWWRGBWRGBWRWRWRWRG; after the rendered color values of each sub-pixel of the 4 pixels are obtained, the sub-pixels of the 4 pixels are rearranged according to the following sequence: BWRGGBWRRGBWRGB; then, the following are sequentially output to a first line of the RGBW-type liquid crystal panel having the same size as the RGB-type liquid crystal panel: the color values of the blue sub-pixel, the white sub-pixel and the red sub-pixel of the first pixel, the rendered color value of the green sub-pixel of the second pixel, the color values of the blue sub-pixel and the white sub-pixel, the rendered color value of the red sub-pixel of the third pixel, the color values of the green sub-pixel and the blue sub-pixel, and the rendered color value of the white sub-pixel of the fourth pixel, and the color values of the red sub-pixel and the green sub-pixel.
Furthermore, if the R, G, B value of each pixel in the input image is scaled by using the above formula (1) in the process of generating the color value of each sub-pixel of each pixel in the RGBW color gamut, the color values of the first three sub-pixels of the first column of pixels and the color values of each sub-pixel of the rest of each pixel among the rendered color value of the first sub-pixel and the color values of the second and third sub-pixels are inversely gamma-transformed by using the following formula (8) after the output needs to be rearranged before outputting the corresponding color value to each sub-pixel unit of the RGBW liquid crystal panel, and the transformed values are output to the RGBW liquid crystal panel.
Data-out(i,j)＝Din(i,j)^re-gamma (8)
In formula (8), Din (i, j) represents the color value of the first three sub-pixels of the first column of pixels after rearrangement of the output, and the color value of the first sub-pixel of each of the rest pixels and the color values of the second and third sub-pixels, where the position coordinate is the color value corresponding to the sub-pixel of (i, j), and Data-out (i, j) represents the value output to the RGBW liquid crystal panel corresponding to the sub-pixel; re-gamma is a transformation coefficient, and the value of re-gamma can be set according to the actual scene needs, for example, the value of re-gamma can be set to 1/2.2.
In the subpixel rendering method provided in the embodiment of the present invention, after the color value of each subpixel of the pixel in the RGBW color gamut is generated according to the R, G, B value of each pixel in the input image, the subpixel is rendered according to the color value of each subpixel, the color value of the most similar subpixel of the subpixel, and the color value of the previous subpixel of the subpixel, and the generated rendered color value of the subpixel considers the color value of the previous subpixel and the color value of the most similar subpixel in the neighborhood thereof, so that the correlation of the color of each subpixel is increased, the abrupt change degree of the color is reduced, and the accuracy of the rendering result is higher.
Secondly, in the subsequent sub-pixel down-sampling processing process, because the fourth sub-pixel of the previous pixel is the same as the first sub-pixel of the next pixel of the pixel, and the color values of the first three sub-pixels of the first column of pixels are finally output, and the rendered color value of the first sub-pixel of each of the rest pixels and the color values of the second sub-pixel and the third sub-pixel are finally output, the color correlation between the pixels is greatly increased, and the color values between the adjacent pixels cannot be mutated, so that the problems of abnormal color points and saw teeth in the finally displayed image are avoided.
Corresponding to the subpixel rendering method for converting the RGB to the RGBW image, the embodiment of the invention also discloses a subpixel rendering device for converting the RGB to the RGBW image.
Referring to fig. 2, fig. 2 is a block diagram illustrating a sub-pixel rendering apparatus for RGB to RGBW image conversion according to an embodiment of the present invention. As can be seen from fig. 2, the sub-pixel rendering apparatus includes:
a color value generating module 201, configured to generate a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image; a most similar sub-pixel determining module 202, configured to determine a most similar sub-pixel of each sub-pixel; the most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to the neighborhood of the sub-pixel where the sub-pixel is located, and all the sub-pixels in the neighborhood of the sub-pixel correspond to the same color; a rendering module 203, configured to render the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel, and the color value of the previous sub-pixel of the sub-pixel, so as to generate a rendered color value of the sub-pixel; the previous sub-pixel of each pixel in the first column is itself, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel in the target neighborhood of the sub-pixel, which is located in the previous column of the sub-pixel and is in the same row as the sub-pixel.
Further, the color value generation module 201 is specifically configured to: scaling R, G, B values of each pixel in the input image to generate a scaled R, G, B value for the pixel; generating an initial color value of the white sub-pixel of each pixel in the RGBW color gamut according to the scaled R, G, B value of the pixel; scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut to generate the color value of the white sub-pixel of the pixel in the RGBW color gamut; and generating the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel in the RGBW color gamut according to the color value of the white sub-pixel of the pixel in the RGBW color gamut.
Further, the rendering module 203 is specifically configured to: for a red sub-pixel, a green sub-pixel and a blue sub-pixel, determining the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the largest color value of the color values of the previous sub-pixels of the sub-pixel as the rendered color value of the sub-pixel; for each white sub-pixel, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
Further, the subpixel rendering apparatus further includes: the downsampling module 204 is specifically configured to: rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to a rule that the adjacent relation of red-green-blue-white-red is the same as the color of the last sub-pixel of the previous pixel and the color of the first sub-pixel of the next pixel of the previous pixel; and after rearrangement, outputting the color values of the first three sub-pixels of the first column of pixels, and the rendered color value of the first sub-pixel and the color values of the second and third sub-pixels of each of the rest pixels.
Further, the target region of each sub-pixel is a 3 × 3 sub-pixel region centered on the sub-pixel.
By adopting the sub-pixel rendering device for converting the RGB to the RGBW image, provided by the embodiment of the invention, the steps in the sub-pixel rendering method for converting the RGB to the RGBW image can be implemented, and the same beneficial effects can be obtained. According to the subpixel rendering device provided by the embodiment of the invention, the generated rendered color value of the subpixel takes into account the color value of the previous subpixel and the color value of the most similar subpixel in the neighborhood, the correlation of the color of each subpixel is increased, the mutation degree of the color is reduced, the rendering result has higher accuracy, the rendered color value is used for performing subsequent down-sampling processing, and the problem of abnormal color points and saw teeth of an image displayed on an RGBW liquid crystal panel is solved.
In specific implementations, the present invention also provides a computer storage medium, which may store a program that, when executed, may include some or all of the steps of the embodiments of the subpixel rendering method for RGB to RGBW image conversion provided by the present invention. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, for the embodiment of the sub-pixel rendering apparatus for RGB to RGBW image conversion, since it is substantially similar to the embodiment of the method, the description is simple, and the relevant points can be referred to the description in the embodiment of the method.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims (8)

1. A method of subpixel rendering for RGB to RGBW image conversion, comprising:
generating a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image;
determining a most similar sub-pixel of said each sub-pixel; the most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to the neighborhood of the sub-pixel where the sub-pixel is located, and all the sub-pixels in the neighborhood of the sub-pixel correspond to the same color;
rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel; the previous sub-pixel of each pixel positioned in the first column is the previous sub-pixel, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel positioned in the previous column of the sub-pixel and in the same row with the sub-pixel in the target neighborhood of the sub-pixel;
rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to a rule that the adjacent relation of red-green-blue-white-red is the same as the color of the last sub-pixel of the previous pixel and the color of the first sub-pixel of the next pixel of the previous pixel;
and after rearrangement, performing inverse gamma transformation on the color values of the first three sub-pixels of the first column of pixels, the rendered color value of the first sub-pixel of each of the rest pixels, and the color values of the second sub-pixel and the third sub-pixel, and outputting the transformed color values.
2. The sub-pixel rendering method of claim 1, wherein the step of generating the color value of each sub-pixel of the pixel in the RGBW color gamut according to the R, G, B value of each pixel in the input image comprises:
scaling R, G, B values of each pixel in the input image to generate a scaled R, G, B value for the pixel;
generating an initial color value of the white sub-pixel of each pixel in the RGBW color gamut according to the scaled R, G, B value of the pixel;
scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut to generate the color value of the white sub-pixel of the pixel in the RGBW color gamut;
and generating the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel in the RGBW color gamut according to the color value of the white sub-pixel of the pixel in the RGBW color gamut.
3. The method of claim 1, wherein the process of rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel, and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel comprises:
for a red sub-pixel, a green sub-pixel and a blue sub-pixel, determining the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the largest color value of the color values of the previous sub-pixels of the sub-pixel as the rendered color value of the sub-pixel;
for each white sub-pixel, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
4. The method of subpixel rendering of claim 1 wherein the target area of each subpixel is the 3 x 3 subpixel area centered on the subpixel.
5. A sub-pixel rendering apparatus for RGB to RGBW image conversion, comprising:
the color value generating module is used for generating a color value of each sub-pixel of each pixel in the RGBW color gamut of the pixel according to the R, G, B value of each pixel in the input image;
a most similar sub-pixel determining module for determining a most similar sub-pixel of each sub-pixel; the most similar sub-pixel of each pixel positioned on the boundary is the sub-pixel with the minimum color difference with the sub-pixel in the target neighborhood where the sub-pixel is positioned; the target neighborhood of each sub-pixel refers to the neighborhood of the sub-pixel where the sub-pixel is located, and all the sub-pixels in the neighborhood of the sub-pixel correspond to the same color;
the rendering module is used for rendering the sub-pixel according to the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the color value of the previous sub-pixel of the sub-pixel, and generating the rendered color value of the sub-pixel; the previous sub-pixel of each pixel positioned in the first column is the previous sub-pixel, and the previous sub-pixel of each remaining sub-pixel refers to the sub-pixel positioned in the previous column of the sub-pixel and in the same row with the sub-pixel in the target neighborhood of the sub-pixel;
the down-sampling module is used for rearranging the sub-pixels of all the pixels in each row in the RGBW color domain according to the adjacent relation of red, green, blue, white and red, and the rule that the last sub-pixel of the previous pixel has the same color as the first sub-pixel of the next pixel of the pixel; and after rearrangement, performing inverse gamma transformation on the color values of the first three sub-pixels of the first column of pixels, the rendered color value of the first sub-pixel of each of the rest pixels, and the color values of the second sub-pixel and the third sub-pixel, and outputting the transformed color values.
6. The subpixel rendering apparatus of claim 5, wherein the color value generating module is specifically configured to:
scaling R, G, B values of each pixel in the input image to generate a scaled R, G, B value for the pixel;
generating an initial color value of the white sub-pixel of each pixel in the RGBW color gamut according to the scaled R, G, B value of the pixel;
scaling the initial color value of the white sub-pixel of each pixel in the RGBW color gamut to generate the color value of the white sub-pixel of the pixel in the RGBW color gamut;
and generating the color values of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel in the RGBW color gamut according to the color value of the white sub-pixel of the pixel in the RGBW color gamut.
7. The subpixel rendering apparatus of claim 5, wherein the rendering module is specifically configured to:
for a red sub-pixel, a green sub-pixel and a blue sub-pixel, determining the color value of each sub-pixel, the color value of the most similar sub-pixel of the sub-pixel and the largest color value of the color values of the previous sub-pixels of the sub-pixel as the rendered color value of the sub-pixel;
for each white sub-pixel, if the color value of the white sub-pixel is smaller than a preset threshold, determining the maximum color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel; or, if the color value of the white sub-pixel is greater than or equal to a predetermined threshold, determining a weighted value of the color value of the white sub-pixel, the color value of the most similar sub-pixel of the white sub-pixel, and the color value of the previous sub-pixel of the white sub-pixel as the rendered color value of the white sub-pixel.
8. The sub-pixel rendering apparatus of claim 5, wherein the target area of each sub-pixel is a 3 x 3 sub-pixel area centered on the sub-pixel.
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