CN114420027A - Method, device, equipment and medium for improving PPI display - Google Patents

Method, device, equipment and medium for improving PPI display Download PDF

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CN114420027A
CN114420027A CN202111640743.1A CN202111640743A CN114420027A CN 114420027 A CN114420027 A CN 114420027A CN 202111640743 A CN202111640743 A CN 202111640743A CN 114420027 A CN114420027 A CN 114420027A
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pixel
pixels
sub
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image data
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魏佳
黄曾�
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)

Abstract

The application relates to a method, apparatus, device and medium for enhancing display of PPI, the method comprising: converting input gray scale image data into brightness data; performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N; converting the brightness data after the sub-pixel rendering processing into processed gray scale image data; and outputting the processed gray-scale image data to a screen for display. By performing sub-pixel rendering processing on original image data, pixels with certain sub-pixel loss caused by a pixel arrangement mode are displayed by means of adjacent pixels in a certain proportion, the effect of displaying images with higher resolution by using few sub-pixels is achieved, meanwhile, the phenomenon of color cast or line breakage caused by sub-pixel loss is avoided, and the purpose of greatly improving the display image quality is achieved.

Description

Method, device, equipment and medium for improving PPI display
Technical Field
The present application relates to the field of image display technologies, and in particular, to a method, an apparatus, a device, and a medium for improving PPI display.
Background
With the development of display technology, various displays and image processing technologies are continuously developed and iterated, and various mature LED display technologies have appeared so far. Compared with the conventional LCD Display (Liquid Crystal Display), in the field, the OLED (Organic Light Emitting Diode/Organic electroluminescent Display), Mini-LED, Micro-LED, QLED (Quantum Dot Light Emitting Diode) and other new displays have the advantages of higher contrast, lower power consumption, flexibility and the like. With the increasing requirements of end products for image quality, OLEDs are moving toward high PPI (pixel per inch, number of pixels per inch of display) to meet the demand. However, higher PPIs mean denser evaporated or printed pixels, which presents a significant challenge to the process.
However, in the implementation process, the inventors found that in some pixel arrangement modes of the above-mentioned new display, if the display screen is displayed without corresponding image data processing, color cast or "line break" phenomenon occurs due to the absence of R sub-pixels or B sub-pixels, and thus the display image quality is poor.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, an image processing device and a computer readable storage medium for displaying PPI, which can greatly improve the display quality of a new display.
A method of enhancing display of PPIs, the method comprising:
converting input gray scale image data into brightness data;
performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
converting the brightness data after the sub-pixel rendering processing into processed gray scale image data;
and outputting the processed gray-scale image data to a screen for display.
In one embodiment, the luminance of the target pixel after the sub-pixel rendering process is equal to the sum of the weighted luminances of the N homogeneous pixels.
In one embodiment, N is 2, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j
wherein R'i,jRepresenting the (i, j) th target pixel after the sub-pixel rendering process, a and b being weight coefficients and the sum being 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A homogeneous pixel.
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels.
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels, i- … …, j- ……；
Before the step of converting the luminance data after the subpixel rendering processing into the processed gray-scale image data, the method further comprises the following steps:
performing sub-pixel rendering processing on G pixels of the same group of target pixels by using N adjacent G pixels on the right side of the G pixels; n is larger than or equal to 2 and N belongs to N.
In one embodiment, the following brightness processing method is adopted to obtain the G pixel after the sub-pixel rendering processing:
G′i,j＝d*G2*i-1,2*j-1+e*G2*i-1,2*j
wherein, G'i,jG pixels representing the (i, j) th after the subpixel rendering process, d and e being weight coefficients and the sum being 1, G2*i-1,2*j-1(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j-1) G pixels, G2*i-1,2*j(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j) And G pixels, i- … … and j- … ….
In one embodiment, the pixel arrangement of the gray-scale image data includes an RG pixel arrangement and a BG pixel arrangement.
An apparatus for enhancing display of PPIs, the apparatus comprising:
the brightness conversion module is used for converting the input gray scale image data into brightness data;
the pixel rendering module is used for performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
the gray scale conversion module is used for converting the brightness data after the sub-pixel rendering processing into processed gray scale image data;
and the data output module is used for outputting the processed gray-scale image data to a screen for display.
An image processing apparatus comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
converting input gray scale image data into brightness data;
performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
converting the brightness data after the sub-pixel rendering processing into processed gray scale image data;
and outputting the processed gray-scale image data to a screen for display.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
converting input gray scale image data into brightness data;
performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
converting the brightness data after the sub-pixel rendering processing into processed gray scale image data;
and outputting the processed gray-scale image data to a screen for display.
One of the above technical solutions has the following advantages and beneficial effects:
according to the method, the device, the equipment and the medium for improving the PPI display, the display accuracy is improved by converting the input gray scale image data into the brightness data, and the sub-pixel rendering processing is performed on the converted brightness data, so that the pixel with the missing sub-pixel can be displayed by using the adjacent pixel. Finally, the luminance data after the sub-pixel rendering processing is converted into the processed gray-scale image data, and the processed gray-scale image data is output to a screen for displaying, so that the effect of displaying a higher-resolution image by using a few sub-pixels can be realized, the color cast or line break phenomenon caused by the sub-pixel missing is avoided, the sharpness of lines can be kept and smooth transition can be realized during displaying, the readability of pictures such as daily application characters and graphs is increased, and the purpose of greatly improving the display quality is achieved.
Drawings
FIG. 1 is a schematic diagram illustrating a color cast phenomenon and a line break phenomenon in a pixel arrangement method according to an embodiment of the present disclosure; wherein, (a) is a schematic diagram of a pixel arrangement mode, (b) is a schematic diagram for displaying white line color cast, and (c) is a schematic diagram for displaying red oblique line 'broken line';
fig. 2 is a schematic flow chart illustrating a method for enhancing PPI display in an embodiment of the present disclosure.
Fig. 3 is a data flow diagram illustrating a method for enhancing PPI display in an embodiment of the present disclosure.
Fig. 4 is a schematic diagram comparing the first set of processing results of a 1-pixel coarse ray diagram in the embodiment of the present application.
Fig. 5 is a schematic diagram comparing processing results of a 1-pixel thick white circle in the embodiment of the present application.
FIG. 6 is a comparison diagram of the second set of processing results of a 1-pixel coarse ray diagram in the example of the present application.
FIG. 7 is a diagram illustrating a comparison of a first set of processing results of a text diagram in an embodiment of the present application.
Fig. 8 is a schematic flow chart illustrating a method for enhancing PPI display in an embodiment of the present application.
FIG. 9 is a comparison diagram of the third set of processing results of the 1-pixel coarse ray diagram in the embodiment of the present application.
FIG. 10 is a diagram illustrating a comparison of the second set of processing results of the text diagrams in the embodiment of the present application.
Fig. 11 is a block diagram of a module structure of an apparatus for enhancing display of PPI in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for improving the PPI display can be applied to displays in all AM drive (Active Matrix) modes, including but not limited to application environments of OLED, Mini-LED, Micro-LED and QLED displays. Fig. 1 shows a color cast phenomenon and a line break phenomenon in one of the pixel arrangement modes, in which (a) is a schematic diagram of the pixel arrangement mode, (b) is a schematic diagram showing white line color cast, and (c) is a schematic diagram showing red oblique line "line break".
The pixel arrangement shown in fig. 1 is composed of RG pixels and BG pixels. If the color shift phenomenon is not processed by the corresponding algorithm, the color shift phenomenon is generated due to the deficiency of the R sub-pixel or the B sub-pixel when the picture is displayed, and the phenomenon of line break is expected to occur when the red or blue pure color line is displayed, so that the overall display image quality is obviously deteriorated. Therefore, image data processing is required to solve such a color shift problem and improve display quality.
The PPI is a unit of image resolution, which indicates the number of pixels (pixels) per inch of a display screen, and the higher the PPI, the better the display quality of the display. The application aims at the technical problem of poor display image quality in a novel display, and provides a method for improving the PPI display, which is characterized in that sub-pixel Rendering (SPR) processing is carried out on original image data, so that pixels with certain sub-pixel loss caused by a pixel arrangement mode can be displayed by using adjacent pixels, the effect of displaying a higher-resolution image (200 x 200 for example) by using a small number of sub-pixels (200 x 100 for example) is realized, the color cast or line break phenomenon caused by sub-pixel loss is avoided, the readability of pictures such as daily application characters and graphs is increased, the display image quality is greatly improved, and the competitiveness of display products is also improved.
In one embodiment, as shown in fig. 2, a method for enhancing PPI display is provided, which is exemplified by the application of the method to the above-mentioned novel display product, and includes the following steps S12 to S18:
s12, the input gray-scale image data is converted into luminance data.
It should be understood that the input gray-scale image data refers to the original image data to be displayed on the screen in the display, which is the original gray-scale data that has not been processed in the subsequent steps of this embodiment. In an image processing device for processing image data at the front end of a screen, input gray-scale image data can be transmitted to a G2L module, and to ensure more accurate display, the gray-scale data needs to be converted into luminance data. The specific process of converting the gray-scale data into the luminance data can be understood by referring to the process flow implemented by the G2L module in the prior art, and the detailed description thereof is omitted.
S14, performing sub-pixel rendering processing on the target pixel with the missing sub-pixel in the brightness data by using N similar pixels adjacent to the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is larger than or equal to 2 and N belongs to N.
It is understood that the target pixel refers to a pixel in which some sub-pixels are missing due to the arrangement of pixels in the luminance data, and may be an R pixel or a B pixel. The sub-pixel rendering processing can be implemented in an SPR algorithm module of an image processing element, and the specific processing procedure can be understood by referring to the processing flow implemented by the existing SPR module in the art, and detailed description is not repeated in this specification, but different in that, in the sub-pixel rendering processing, the used adjacent pixels are N similar pixels adjacent to the right side of the target pixel, so that the brightness transition of the pixels is smoother when the sub-pixel rendering processing is performed on the R pixel and the B pixel or one of the two types of pixel data, the sharpness and the forward-backward connection of the lines are better maintained, and the phenomenon of unsmooth brightness transition due to backward borrowing of the pixels can be avoided, thereby finally causing the problem of distortion of the displayed image. The value of the number N of borrowed adjacent pixels can be comprehensively selected according to the requirements of the calculated amount of equipment and the display image quality.
S16, the luminance data after the subpixel rendering process is converted into processed grayscale image data.
And S18, outputting the processed gray-scale image data to a screen for display.
It is understood that the luminance data after the sub-pixel rendering process may be transmitted to an L2G module of the image processing device for processing, so as to convert the luminance data into gray scale data (De-Gamma), and finally, the gray scale data may be output to a screen of a display for displaying images.
According to the method for improving the PPI, the display accuracy is improved by converting the input gray scale image data into the brightness data, and the sub-pixel rendering processing is performed on the converted brightness data, so that the pixels with the missing sub-pixels can be displayed by means of the adjacent pixels. Finally, the luminance data after the sub-pixel rendering processing is converted into the processed gray-scale image data, and the processed gray-scale image data is output to a screen for displaying, so that the effect of displaying a higher-resolution image by using a few sub-pixels can be realized, the color cast or line break phenomenon caused by the sub-pixel missing is avoided, the sharpness of lines can be kept and smooth transition can be realized during displaying, the readability of pictures such as daily application characters and graphs is increased, and the purpose of greatly improving the display quality is achieved.
In one embodiment, as shown in fig. 3, which is a data flow diagram of the above steps, the flow of the steps of the above method can be implemented by hardware integration in a Driver IC (Driver chip) of a display or a T-CON (logic board) of the display, and is divided into three blocks, i.e., G2L, SPR and L2G, wherein the block G2L and the block L2G can be stored in a look-up table LUT.
After the display is powered on, the originally input gray scale image data is accessed to a Driver IC or T-CON of the display, so that the step flow of the method for improving the PPI display can be automatically executed, the corresponding data processing process is completed, and the gray scale image data finally output to the screen is subjected to image display through the screen to obtain a display image with higher image quality.
In one embodiment, the pixel arrangement of the gray-scale image data includes an RG pixel arrangement and a BG pixel arrangement. Optionally, in this embodiment, the pixel arrangement manner targeted by the method for improving PPI display may be an arrangement manner in which RG and BG are pixels, the missing sub-pixel may be R or B, and the image quality improvement effect may reach an optimal level.
In one embodiment, the luminance of the target pixel after the sub-pixel rendering process is equal to the sum of the weighted luminances of the N homogeneous pixels.
It is to be understood that, in the subpixel rendering process, the input data includes N adjacent homogeneous pixels borrowed to the right of the target pixel, and the luminance of the target pixel after the subpixel rendering process is equal to the sum of the weighted luminances of the input data.
In one embodiment, N is 2, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j
wherein R'i,jRepresenting the (i, j) th target pixel after the sub-pixel rendering process, a and b being weight coefficients and the sum being 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A homogeneous pixel.
Specifically, in this embodiment, the target pixel may be an R pixel, or a B pixel, or two types of pixel data are missing at the same time, and both the sub-pixel rendering processing for the R pixel and the sub-pixel rendering processing for the B pixel may be implemented by using the processing formula. For ease of illustration, the following are: taking R pixels as an example (B pixels are processed in the same way as R pixels), the following can be used:
R′11＝a*R11+b*R12，R′12＝a*R13+b*R14，…，R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j
luminance R 'after treatment'i,jEqual to the sum of the weighted luminance of the input data. Where a and b are weighting factors and the sum is 1, a and b can be flexibly adjusted, for example, but not limited to, values of a-0.5 and b-0.5. Fig. 4 is a schematic diagram showing the comparison of the processing results of a ray diagram with a thickness of 1 pixel, and fig. 5 is a schematic diagram showing the comparison of the processing results of a white circle with a thickness of 1 pixel, so that the lines displayed after the processing by the method greatly improve the color cast or the line breakage caused by the missing of some sub-pixels, and simultaneously keep the sharpness of the lines without being over-blurred.
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels.
Specifically, in this embodiment, the target pixel may be an R pixel, or a B pixel, or two types of pixel data are missing at the same time, and both the sub-pixel rendering processing for the R pixel and the sub-pixel rendering processing for the B pixel may be implemented by using the processing formula. For ease of illustration, the following are: taking R pixels as an example (B pixels are processed in the same way as R pixels), the following can be used:
R′11＝a*R11+b*R12+c*R13，R′12＝a*R13+b*R14+c*R15，…，
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
luminance R 'after treatment'i,jEqual to the sum of the weighted intensities of the input data, where a, b and c are weighting coefficients and the sum is 1, a, b and c can be flexibly adjusted, for example, but not limited to, values a-1/3, b-1/3, c-1/3; fig. 6 is a schematic diagram comparing processing results of a ray diagram with a thickness of 1 pixel, fig. 7 is a schematic diagram comparing processing results of a character diagram, and it can be seen that lines displayed after the processing by the method are greatly improved, and the phenomenon of line breakage caused by the absence of some sub-pixels is greatly improved.
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein，R′i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels.
As shown in fig. 8, before the step S16, the method may further include a step S15:
s15, performing sub-pixel rendering processing on the G pixels of the same group of the target pixel by using N adjacent G pixels on the right side of the G pixels; n is larger than or equal to 2 and N belongs to N.
It is understood that the G pixels of the same group as the target pixel refer to G pixels in the same pixel arrangement as the target pixel. In this embodiment, the target pixel may be an R pixel, a B pixel, or two kinds of pixel data that are missing at the same time, and both the sub-pixel rendering processing for the R pixel and the sub-pixel rendering processing for the B pixel may be implemented by using the processing formula described above. In addition, the sub-pixel rendering processing is also carried out on the G pixel data, the brightness near the R pixel and/or the B pixel is enhanced, the condition of line color cast or line breakage of the processed display picture is further improved, and therefore the display picture quality can be further improved.
In one embodiment, the following brightness processing method is adopted to obtain the G pixel after the sub-pixel rendering processing:
G′i,j＝d*G2*i-1,2*j-1+e*G2*i-1,2*j
wherein, G'i,jG pixels representing the (i, j) th after the subpixel rendering process, d and e being weight coefficients and the sum being 1, G2*i-1,2*j-1(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j-1) G pixels, G2*i-1,2*j(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j) And G pixels.
Specifically, for the sake of illustration, the following are: taking R pixels as an example (B pixels are processed in the same way as R pixels), the following can be used:
R′11＝a*R11+b*R12+c*R13，R′12＝a*R13+b*R14+c*R15，
…，R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
G′11＝d*G11+e*G12，G′12＝a*G13+b*G14，…，
G′i,j＝a*G2*i-1,2*j-1+b*G2*i-1,2*j
luminance R 'after treatment'i,jEqual to the sum of the weighted intensities of the input data, where a, b and c are weighting coefficients and the sum is 1, a, b and c can be flexibly adjusted, for example, but not limited to, values a-1/3, b-1/3 and c-1/3. And G is also subjected to rendering processing, the sum of d and e is 1, and d and e can also be flexibly adjusted, for example, but not limited to, the value d is 0.5, and e is 0.5. Fig. 9 is a schematic diagram comparing processing results of a ray diagram with a thickness of 1 pixel, fig. 10 is a schematic diagram comparing processing results of a character diagram, and a display line processed by an algorithm can be seen, and meanwhile, the situations of color cast and line breakage caused by the absence of some sub-pixels are improved.
It should be understood that although the steps in the flowcharts of fig. 1 and 8 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 8 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 11, there is further provided an apparatus 100 for enhancing display of PPI, comprising: a brightness conversion module 11, a pixel rendering module 13, a grayscale conversion module 15 and a data output module 17. Wherein: the luminance conversion module 11 is configured to convert input grayscale image data into luminance data. The pixel rendering module 13 is configured to perform sub-pixel rendering processing on a target pixel with a missing sub-pixel in the luminance data by using N similar pixels adjacent to the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is larger than or equal to 2 and N belongs to N. The gray scale conversion module 15 is configured to convert the luminance data after the sub-pixel rendering processing into processed gray scale image data. The data output module 17 is configured to output the processed grayscale image data to a screen for display.
According to the device 100 for improving the display of the PPI, through cooperation of the modules, the input gray scale image data is firstly converted into the luminance data, the display accuracy is improved, and then the sub-pixel rendering processing is performed on the converted luminance data, so that the pixel with the missing sub-pixel can be displayed by using the adjacent pixel. Finally, the luminance data after the sub-pixel rendering processing is converted into the processed gray-scale image data, and the processed gray-scale image data is output to a screen for displaying, so that the effect of displaying a higher-resolution image by using a few sub-pixels can be realized, the color cast or line break phenomenon caused by the sub-pixel missing is avoided, the sharpness of lines can be kept and smooth transition can be realized during displaying, the readability of pictures such as daily application characters and graphs is increased, and the purpose of greatly improving the display quality is achieved.
In one embodiment, the pixel arrangement of the gray-scale image data includes an RG pixel arrangement and a BG pixel arrangement.
In one embodiment, the luminance of the target pixel after the sub-pixel rendering process is equal to the sum of the weighted luminances of the N homogeneous pixels.
In one embodiment, N is 2, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i′,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j
wherein R'i,jRepresenting the (i, j) th target pixel after the rendering processing of the sub-pixel, a and b being weightsA weight ratio and a sum of 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2 × j) homogeneous pixels, i- … …, j- … ….
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels.
In one embodiment, N is 3, and the target pixel after the subpixel rendering processing is obtained by adopting the following brightness processing manner:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels;
before the step of converting the luminance data after the subpixel rendering processing into the processed gray-scale image data, the method further comprises the following steps:
performing sub-pixel rendering processing on G pixels of the same group of target pixels by using N adjacent G pixels on the right side of the G pixels; n is larger than or equal to 2 and N belongs to N.
In one embodiment, the following brightness processing method is adopted to obtain the G pixel after the sub-pixel rendering processing:
G′i,j＝d*G2*i-1,2*j-1+e*G2*i-1,2*j
wherein, G'i,jG pixels representing the (i, j) th after the subpixel rendering process, d and e being weight coefficients and the sum being 1, G2*i-1,2*j-1(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j-1) G pixels, G2*i-1,2*j(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j) And G pixels.
For specific limitations of the apparatus 100 for enhancing display of PPI, reference may be made to the above limitations of the method for enhancing display of PPI, which are not described herein again. The above-mentioned modules in the apparatus 100 for enhancing PPI display may be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the image processing device, and can also be stored in a memory in the image processing device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, there is provided an image processing apparatus comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the following steps when executing the computer program: converting input gray scale image data into brightness data; performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N; converting the brightness data after the sub-pixel rendering processing into processed gray scale image data; and outputting the processed gray-scale image data to a screen for display.
In one embodiment, the processor, when executing the computer program, further performs the steps of the remaining embodiments of the method for enhancing PPI display described above.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: converting input gray scale image data into brightness data; performing sub-pixel rendering processing on a target pixel with a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N; converting the brightness data after the sub-pixel rendering processing into processed gray scale image data; and outputting the processed gray-scale image data to a screen for display.
In one embodiment, the computer program, when executed by the processor, further performs the steps of the remaining embodiments of the method for enhancing the display of PPIs described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for enhancing PPI display, comprising the steps of:
converting input gray scale image data into brightness data;
performing sub-pixel rendering processing on a target pixel of the missing sub-pixels in the brightness data by using N similar pixels adjacent to the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
converting the brightness data after the sub-pixel rendering processing into the processed gray scale image data;
and outputting the processed gray-scale image data to a screen for display.
2. The method for enhancing display of PPIs of claim 1, wherein the luminance of the target pixel after sub-pixel rendering is equal to the sum of the weighted luminances of N of said homogeneous pixels.
3. The method for improving PPI display according to claim 2, wherein N-2, the target pixel after subpixel rendering is obtained by the following luminance processing:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j
wherein R'i,jRepresenting the (i, j) th target pixel after the sub-pixel rendering process, a and b being weight coefficients and the sum being 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A homogeneous pixel.
4. The method for improving PPI display according to claim 2, wherein N-3, the target pixel after subpixel rendering is obtained by the following luminance processing:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels, i- … …, j- … ….
5. The method for improving PPI display according to claim 2, wherein N-3, the target pixel after subpixel rendering is obtained by the following luminance processing:
R′i,j＝a*R2*i-1,2*j-1+b*R2*i-1,2*j+c*R2*i-1,2*j+1
wherein R'i,jRepresents the (i, j) th target pixel after the sub-pixel rendering process, a, b and c are weight coefficients and the sum is 1, R2*i-1,2*j-1Denotes the (2)*i-1,2*j-1) homogeneous pixels, R2*i-1,2*jDenotes the (2)*i-1,2*j) A pixel of the same type, R2*i-1,2*j+1Denotes the (2)*i-1,2*j +1) homogeneous pixels, i- … …, j- … …;
before the step of converting the luminance data after the subpixel rendering processing into the processed grayscale image data, the method further comprises the steps of:
performing sub-pixel rendering processing on the G pixels of the same group of the target pixels by using N adjacent G pixels on the right side of the G pixels; n is larger than or equal to 2 and N belongs to N.
6. The method for improving PPI display according to claim 5, wherein the following luma processing is used to obtain sub-pixel rendered G pixels:
G′i,j＝d*G2*i-1,2*j-1+e*G2*i-1,2*j
wherein, G'i,jG pixels representing the (i, j) th after the subpixel rendering process, d and e being weight coefficients and the sum being 1, G2*i-1,2*j-1(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j-1) G pixels, G2*i-1,2*j(2) th pixel showing the right side neighbor of the G pixel before processing*i-1,2*j) And G pixels.
7. The method for improving PPI display according to any of claims 1-6, wherein the pixel arrangement of the grayscale image data comprises an RG pixel arrangement and a BG pixel arrangement.
8. An apparatus for enhancing PPI display, the apparatus comprising:
the brightness conversion module is used for converting the input gray scale image data into brightness data;
the pixel rendering module is used for performing sub-pixel rendering processing on a target pixel of a missing sub-pixel in the brightness data by using N adjacent similar pixels on the right side of the target pixel; the target pixel is an R pixel or a B pixel, N is more than or equal to 2 and N belongs to N;
the gray scale conversion module is used for converting the brightness data subjected to the sub-pixel rendering processing into the processed gray scale image data;
and the data output module is used for outputting the processed gray-scale image data to a screen for display.
9. An image processing apparatus comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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