CN109859700B - Data processing method and data processing device - Google Patents
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Abstract
The application provides a data processing method and a data processing device, comprising the following steps: converting the data from an RGB format to a YUV format; compressing the data in the YUV format according to a certain proportion; setting a first threshold value and a second threshold value, wherein the first threshold value is larger than the second threshold value; selecting a pixel point as a current pixel point, and comparing the current compressed data pixel point with surrounding pixel points to obtain a difference value; and eliminating surrounding pixel points corresponding to the difference value larger than the first threshold value and smaller than the second threshold value, taking the remaining surrounding pixel points as reference pixel points, setting the number of the corresponding position, and selecting the number of the corresponding position of one reference pixel point to replace the data of the current pixel point.
Description
Technical Field
The present invention relates to a data processing method and a data processing apparatus, and more particularly to a data processing method and a data processing apparatus in the display field.
Background
An Over Driver (OD) of the display device is a module that occupies a Static Random-Access Memory (SRAM), and the size of the SRAM has a great influence on the cost of the timing controller. In the design of the current time schedule controller, the over driver needs to store the whole data of the previous frame, and the current frame inquires the lookup table according to the data of the previous frame and the current frame to determine the final output data, so the over driver is the module which occupies the most SRAM, and therefore, the cost of the SRAM in the field of the time schedule controller is very high.
Taking three resolutions of current HD (High Definition ), FHD (Full High Definition) and UHD (Ultra High Definition) as examples, the SRAM capacity occupied by the over driver is 26Mbit,50Mbit,200Mbit which occupies a large proportion of the whole chip design without considering compression, so the capacity of the SRAM can be greatly saved in the over driver design by using the data compression technology commonly used in the industry, and the SRAM capacity required by the HD/FHD/UHDTCON (Timer Control Register, logic board) can be reduced to 8.7Mbit/16.7Mbit/66.7Mbit by using the triple compression commonly used in the industry as an example, but the over driver still occupies a large amount of SRAM, which has a great influence on the cost of the timing controller and cannot effectively Control the cost.
Disclosure of Invention
In order to solve the above technical problem, an object of the present application is to provide a data processing method. In the data processing method, data is converted from an RGB format to a YUV format, then the YUV format data is compressed according to a certain proportion, pixel points are compared with surrounding pixel points one by one on the basis, the pixel points which are larger than a first threshold value and smaller than a second threshold value are eliminated, whether the threshold value is further set is determined according to the number of reference pixel points until the position number of the selected pixel point replaces the data of the current pixel point, so that the data compression technology is more comprehensive in data compression, the effect of compressing the data with higher multiplying power is achieved, the purposes of reducing the use of an SRAM and controlling the cost of a time schedule controller are achieved, meanwhile, the brightness of a display picture can be improved, and the contrast of the display picture can be improved to a certain extent.
The purpose of the application and the technical problem to be solved are realized by adopting the following technical scheme. According to the data processing method provided by the application, the first step is as follows: converting the data from RGB to YUV format, wherein Y represents luminance and UV represents chrominance, thereby separating luminance and chrominance from the display data; the second step is that: according to the characteristic that the sensitivity of human eyes to brightness is far higher than that of chroma, the human eye characteristic is taken as a reference to further determine the compression ratio, for example: the brightness can compress the original 8bit into 4bit, and the UV can compress the original 8bit into 2bit, so that RGB (888) is compressed into YUV (422), and the data compression benefit of 3 multiplying power is achieved; the third step: and on the basis of 3 times of data compression in the second step, comparing the data of the current pixel point with the data of the surrounding pixel points to obtain more than one difference value, excluding the pixel point data corresponding to the difference value larger than the first threshold value and smaller than the second threshold value, using the rest pixel points as reference pixel points and setting corresponding position numbers, and selecting the position numbers to replace the data of the current pixel point so as to achieve the effect of data compression.
In some embodiments of the present application, the pixel points in the pixel matrix are used as the basic unit, the data of the pixel points are compared with the data of the surrounding pixel points one by one, and the number of the reference pixel point meeting the relevant condition is cited as the compressed data of the current pixel point.
In an embodiment of the present application, the threshold is set as a first threshold and a second threshold, where the first threshold is greater than the second threshold.
In the embodiment of the application, the data of the reference pixel point within the first threshold and the second threshold are relatively similar, so that the number corresponding to the reference pixel point within the threshold can be randomly selected to replace the data of the current pixel point.
In an embodiment of the present application, the data of the current pixel and the data of the surrounding pixels are compared and subtracted to obtain more than one difference, and when the plurality of differences are all greater than the first threshold or all smaller than the second threshold, the second threshold is further set, so that the number of the reference pixels is more than 1.
In an embodiment of the present application, different position numbers are set for the current pixel and the reference pixel corresponding to the current pixel, according to different relative positions of the current pixel and the reference pixel.
In an embodiment of the present application, the number of surrounding pixels owned by different pixels may be the same or different, and when the number of surrounding pixels is less than a certain limit value, the data of the current pixel is maintained.
In an embodiment of the present application, as shown in fig. 3, the reference pixel is located at the left side, the upper left side, and the upper side of the current pixel, but not limited thereto, and the specific position is set according to the situation of the specific embodiment.
In an embodiment of the present application, the number of the surrounding pixels is 3, and the surrounding pixels are located at the left side, the top side, and the top left side of the current pixel, but not limited thereto, and the number and the positions of the designated pixels in different embodiments may be set according to specific situations.
In an embodiment of the present application, the number of reference pixels of the current pixel is smaller than the number of surrounding pixels, the number of reference pixels is 1, and the number of surrounding pixels is 3, but not limited thereto, and different embodiments are determined according to actual situations.
In an embodiment of the present application, data of a current pixel is replaced by a number of a reference pixel, and during decompression, data on a pixel corresponding to the number is transmitted to the current pixel as decompressed data.
In an embodiment of the present application, a number of a pixel point as a reference pixel point is referred to as compressed data of a current pixel point, the data size of the reference pixel point is fixed, and the number corresponding to the reference pixel point is limited to be referred to by the current pixel point.
In an embodiment of the present application, when a current pixel refers to a number of a reference pixel as its compressed data, its data is not used for comparison and replacement.
In an embodiment of the present application, when the difference values between the reference pixel data and the current pixel data are both greater than the first threshold value or both smaller than the second threshold value, the second threshold value is further set, so that the number of the reference pixel points is more than 1, and position numbers are set for the reference pixel points.
In an embodiment of the application, after the threshold is further set to the second threshold, when the number of reference pixels still cannot be met, another pixel is used as a data standard, a specific number is introduced to replace data of the current pixel, and a value of the data standard pixel is used as decompressed data of the current position.
In an embodiment of the present application, the number of the current pixel point is referred to that the data of the current pixel point remains unchanged.
In an embodiment of the present application, an n-bit number is used as a number, where n may be 2, 3, or 4, but is not limited thereto.
In an embodiment of the application, a number with the size of n bits is used as a serial number, and the number of pixel points is less than or equal to 2^ n; generally, when the number of the surrounding pixel points is 2^ n, the number of the reference pixel points is increased in a certain sense, and the error caused by replacement is favorably reduced.
The application also aims to provide a data processing device, which comprises a data conversion module, a data processing module and a data processing module, wherein the data conversion module is used for converting original RGB format data into YUV format data; the data compression module is used for compressing the data in the YUV format according to a certain proportion; and the data comparison and replacement module is used for comparing the data of the pixel points with the data of the surrounding pixel points, eliminating the surrounding pixel points outside the threshold value, randomly selecting a residual reference pixel point and referring the number of the residual reference pixel point to replace the data of the current pixel point.
According to the data processing method, data are compressed at a higher multiplying power on the basis of traditional triple compression, real-time performance is achieved, the compression technology is unique and exquisite, the SRAM capacity of the time schedule controller is reduced, and the effect of controlling the cost of the time schedule controller is achieved; meanwhile, the brightness of the display panel can be improved, so that the contrast of a display picture can be improved to a certain extent.
Drawings
FIG. 1 is an exemplary overvoltage drive architecture diagram;
fig. 2 is a conversion formula for converting RGB format data into YUV format data according to an embodiment of the present application;
FIG. 3 is a schematic diagram of data comparison in an embodiment of the present application;
FIG. 4 is a flow chart of an embodiment of the present application;
FIG. 5 is a schematic diagram of a data compression system according to an embodiment of the present application;
fig. 6 is a schematic diagram of a plurality of reference pixels according to an embodiment of the present application.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. In the present application, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", and the like are merely referring to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting.
The drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the drawings, elements having similar structures are denoted by the same reference numerals. In addition, the size and thickness of each component shown in the drawings are arbitrarily illustrated for understanding and ease of description, but the present application is not limited thereto.
In addition, in the description, unless explicitly described to the contrary, the word "comprise" will be understood to mean that the recited components are included, but not to exclude any other components. Further, in the specification, "on.
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the data processing method and the data processing system according to the present invention will be made with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a diagram of an exemplary overvoltage drive configuration. As shown in fig. 1, in the design of the current timing controller, the over driver needs to store the whole data of the previous frame, the current frame queries the lookup table according to the data of the previous frame and the current frame, and determines the final output data, and the over driver is the module that occupies the most SRAM, so that the data needs to be compressed before the current frame data and the previous frame data are input into the cache.
Referring to fig. 1, first, data of a previous frame and data of a current frame are respectively transmitted to a data compression module 101 and a data compression module 102 for compression, and data of the current frame is transmitted to a linear cache module 108, and after the data compression modules 101 and 102 complete data compression, the compressed data are stored in a frame cache module 103 and a linear cache module 104; when comparing the current frame data with the previous frame data, the data of the frame buffer module 103 and the data of the linear buffer module 104 are respectively transmitted into the data decompression module 105 and the data decompression module 106, and after data decompression is completed, the decompressed data are transmitted into the overvoltage processing unit 107 to obtain a compared data difference value between the current frame and the previous frame; and finally, the compared data difference value and the current frame data of the linear cache module are transmitted into the processing unit 109 to be processed, and the final output overvoltage driving value is determined by combining the current frame data.
Referring to fig. 2, a conversion formula of RGB format data into YUV format data is as follows: y ═ 0.30R +0.59G + 0.11B; u ═ 0.493 (B-Y); v ═ 0.877 (R-Y).
Some embodiments of the present application are based on triple compression of exemplary data, that is, data is further processed based on triple compression, so as to further improve the benefit of data compression in the flow shown in fig. 1, thereby reducing the cost of the capacity control timing controller of the SRAM.
In some embodiments of the present application, the YUV data of the pixel points of the image are further compressed by using the pixel points in the pixel matrix as the basic unit.
In the embodiment of the application, the reference pixel point is formed by one or more peripheral pixel data; if the number of the reference pixel points is 1, numbering the reference pixel points by 00; if the number of the reference pixel points is 2, numbering the reference pixel points by 00 and 01; if the number of the reference pixel points is 1, numbering the three reference pixel points 00, 01 and 10.
In the embodiment of the present application, as shown in fig. 6, for the reference pixels, when the number of the reference pixels of the current pixel is greater than 4 and is less than or equal to 6, the occupied size is 3 bits; the number of the reference pixel points of the current pixel point is less than 4, and the occupied size is 2 bits.
Fig. 3 is a schematic diagram of data comparison in an embodiment of the present application. As shown in fig. 3, in an embodiment of the present application, a circle is a current pixel point 200, where M represents a pixel matrix, and (i, j) represents a position in the pixel matrix, where i is a non-negative integer and represents a row position of the pixel point in the pixel matrix; j is a nonnegative integer, represents the column position of the pixel point in the pixel matrix, selects the upper left pixel point 201, the upper pixel point 202 and the left side 203 of the current pixel point 200 as the surrounding pixel points, excludes a pixel point which is larger than a first threshold value and a pixel point which is smaller than a second threshold value, uses the remaining pixel points as reference pixel points, uses 2-bit binary numbers as corresponding numbers, such as 00, 01, 10 and the like, and quotes the numbers to replace the data of the current pixel point, so that the data of one pixel point can be compressed to 2 bits.
In an embodiment of the present application, after excluding the surrounding pixel data, the remaining reference pixels can be coded with different numbers of 2^ n using an n-bit data, including a number for recording a special case.
In an embodiment of the present application, referring to fig. 3, the pixel 200 is a current pixel, and the pixels 201, 202, and 203 are surrounding pixels; comparing the data sizes of the surrounding pixels 201, 202 and 203 with the data size of the current pixel 200 to obtain a plurality of difference values, excluding the pixels corresponding to the difference values larger than a first threshold and the difference values smaller than a second threshold, at this time, remaining 1 reference pixel, setting the number of the corresponding position for the reference pixel, and introducing the corresponding number to replace the data of the current pixel.
In an embodiment of the present application, the data comparison between the current pixel number and the surrounding pixels is selected and can be divided into random comparison and comparison according to a distance sequence.
In an implementation of the present application, the threshold is determined according to a display condition near a current pixel, where the display condition near the current display screen refers to a real-time highest display brightness and display chromaticity, and a real-time lowest display brightness and display chromaticity, and the current pixel is compared with a value of the highest display brightness and chromaticity, and a value of the lowest display brightness and chromaticity, respectively, to obtain the first threshold and the second threshold.
In the embodiment of the application, the data of the reference pixel points within the first threshold and the second threshold are relatively similar, so that when the number of the reference pixel points is more than or equal to 2, the number corresponding to the reference pixel point can be randomly selected to replace the data of the current pixel point; the pixel data will show a smoother display and at the same time improve the contrast to some extent.
In an embodiment of the present application, referring to fig. 3, the pixel 200 is a current pixel, and the pixels 201, 202, and 203 are surrounding pixels; and comparing the data sizes of the surrounding pixel points 201, 202 and 203 with the data size of the current pixel point 200 to obtain a plurality of difference values, further setting a second threshold value when the difference values are all larger than the first threshold value or all smaller than the second threshold value, enabling the current pixel point to have at least 1 reference pixel point, setting the serial number of the reference pixel point, and citing the serial number to replace the data of the current pixel point.
In the embodiment of the present application, after further setting the second threshold, when the number of the reference pixels cannot be met, another pixel data standard value is selected and numbered, and the number is referred to replace the data of the current pixel, in the embodiment of the present application, a 2-bit binary number 11 is used, and the pixel data standard value during decompression is used as the decompressed data of the current pixel.
In the embodiment of the present application, when the number of the surrounding pixels used for data comparison is smaller than a limit value, data comparison and number reference are not performed on the surrounding pixels, and the data of the current pixel is maintained.
In an embodiment of the present application, a pixel can be used as a reference pixel when the reference condition of other different pixels is met, but when a pixel is numbered and the number is quoted to replace the data of the pixel, the pixel is no longer used as a reference pixel of other pixels.
In an embodiment of the present application, referring to fig. 3, a pixel 200 in a circle is a current pixel, and pixels 201, 202, and 203 are surrounding pixels, and it is assumed that a number is already cited as compressed data for the pixel 202, so that the data of the pixel 202 will not be compared with the current pixel 200, and the number 10 of the pixel 202 will not be cited by the current pixel 200.
In an embodiment of the present application, it is assumed that the number of surrounding pixels of a pixel is 8, as shown in fig. 6, when the surrounding pixels larger than the first threshold and smaller than the second threshold are excluded from the current pixel M (i, j), the remaining reference pixels are 6, at this time, 3-bit binary digits are used to number the reference pixels, for example, 000, 001, 010, 011, 100, and 101, and in this embodiment, the number of the reference pixels owned by a pixel is at most not more than 6.
In an embodiment of the present application, referring to fig. 3, the upper left pixel 201, the upper top pixel 202, and the left pixel 203 of the current pixel 200 are set as surrounding pixels, and the positions and the number of the pixels are set according to specific situations.
Fig. 4 is a flow chart of an embodiment of the present application. In the embodiment of the present application, as shown in fig. 4, a first step S301: converting the data from an RGB format to a YUV format; second step S302: compressing the data in the YUV format according to a certain proportion; third step S303: comparing a pixel point with surrounding pixel points to obtain a plurality of difference values, excluding the surrounding pixel points corresponding to the difference values larger than a first threshold value or smaller than a second threshold value, and further selecting the position numbers corresponding to the remaining reference pixel points to replace the data of the current pixel point; if the number of the reference pixel points does not meet the requirement, a second threshold value is further set, and then the number of the reference pixel points is selected to replace the data of the current pixel points; if the number of the reference pixel points is not met, a data standard is selected, and a specific number is set to replace the data of the current pixel point. The general flow of the present application is described in detail in the above examples.
FIG. 5 is a schematic diagram of a data compression system. Referring to fig. 5, in an embodiment of the present application, the data compression system is composed of a data conversion module 401, a data compression module 402, and a data comparison and replacement module 403: the data conversion module 401 converts the original RGB format data into YUV format data according to a certain formula, and separates the chrominance and luminance data of the pixel; a data compression module 402, which compresses the YUV format data according to a certain proportion; the comparison and replacement module 403 compares the pixel point with surrounding pixel points, and further selects the position number corresponding to the remaining reference pixel point to replace the data of the current pixel point after the surrounding pixel points outside the threshold are excluded.
In an embodiment of the present application, the data conversion module 401 converts the original RGB format of the image into the YUV format, and the data compression module 402 compresses the luminance Y of a pixel of the YUV data from 8 bits to 4 bits, and the chrominance UV from 8 bits to 2 bits, so that RGB (888) is compressed to YUV (422), which has a data compression efficiency of 3 times.
In an embodiment of the present application, the comparison and replacement module 403 compares the data of the current pixel with the data of a plurality of surrounding pixels, excludes surrounding pixels larger than the first threshold and smaller than the second threshold, and uses the remaining surrounding pixels as reference pixels, where the reference pixels have numbers of corresponding positions, and the reference pixel closest to the current pixel is referred to as compressed data of the current pixel.
In an embodiment of the present application, referring to fig. 5, in the data comparison and replacement module 403, if the data difference values are both greater than the first threshold or both less than the second threshold, at this time, the original surrounding pixel points are not referred, and a pixel data standard is selected, and a 2-bit binary number 11 is used as the compressed data of the current pixel point, and during decompression, the pixel data standard is used as the decompressed data of the current pixel point.
In an embodiment of the present application, referring to fig. 5, in the data comparison and replacement module 403, the data difference value of the surrounding pixel points is between the first threshold and the second threshold, and if a reference pixel point is already referred to as a compressed data, the reference pixel point is not replaced.
According to the technical scheme, data compression is further completed on the basis of the original 3-magnification data compression benefit, occupation of image data on the SRAM is further reduced, and the data compression effect is effectively achieved.
In some embodiments, the data compression method of the present application is applied to a display device, such as a liquid crystal display panel, but is not limited thereto, and may also be an OLED (Organic Light-Emitting Diode) display panel, a QLED (Quantum Dot Light Emitting Diode) display panel, a plasma display panel, and the like, and is also applied to other non-display fields.
The terms "in some embodiments" and "in various embodiments" are used repeatedly. The terms generally do not refer to the same embodiment; it may also refer to the same embodiment. The terms "comprising," "having," and "including" are synonymous, unless the context dictates otherwise.
Although the present application has been described with reference to specific embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.
Claims (9)
1. A data processing method, characterized by comprising the steps of:
converting picture data from an RGB format into a YUV format, wherein the YUV format data is subjected to data compression according to a certain proportion;
setting a first threshold and a second threshold, the first threshold being greater than the second threshold;
selecting a pixel point as a current pixel point, and comparing the current pixel point with the data of the compressed surrounding pixel points one by one to obtain a difference value;
and excluding the surrounding pixel points corresponding to the difference value larger than the first threshold value and smaller than the second threshold value, taking the remaining surrounding pixel points as reference pixel points, correspondingly setting position numbers, selecting one number from the reference pixel points to replace the data of the current pixel point, and compressing.
2. The data processing method of claim 1, wherein the current pixel is compared with surrounding pixels to find a difference, and when the difference is greater than a first threshold or less than a second threshold, the first threshold or the second threshold needs to be further set so that the current pixel has more than one reference pixel.
3. The data processing method of claim 2, wherein after further setting the second threshold, the number of reference pixels is not satisfied, and a data criterion is selected and a position number is set for the data criterion, and the position number is referred to replace the data of the current pixel.
4. The data processing method of claim 1, wherein when performing the comparison determination, the position number of the current pixel is referred to, and the data of the current pixel is maintained.
5. The data processing method of claim 1, wherein when the number of the surrounding pixels used for data comparison is less than a limit value, the data comparison and number reference are not performed on the surrounding pixels, and the data of the current pixel is maintained.
6. The data processing method according to claim 1, wherein during decompression, the data of the current pixel is replaced by the data of the reference pixel corresponding to the position number according to the position number quoted by the current pixel.
7. The data processing method according to claim 1, wherein the reference pixels are such that, for the reference pixels of the current pixel, the number of the reference pixels is greater than 4 and less than or equal to 6, the position number occupies 3 bits; the number of the reference pixel points of the current pixel point is less than 4, and the position number occupies 2 bits.
8. A data processing apparatus, comprising:
the data conversion module is used for converting the original RGB format data into YUV format data;
the data compression module is used for compressing the data in the YUV format according to a certain proportion;
the comparison and replacement module is used for comparing and removing the current compressed data of a pixel point with the data of the surrounding pixel points, and selecting a position number corresponding to a reference pixel point to replace the data of the current pixel point;
the comparison and replacement module compares the pixel point with surrounding pixel points to obtain a difference value, excludes the surrounding pixel points of which the difference value is greater than a first threshold value or less than a second threshold value, and further selects the position numbers corresponding to the remaining reference pixel points to replace the data of the current pixel point.
9. A data processing method, characterized by comprising the steps of:
converting the data from an RGB format to a YUV format;
compressing the data in the YUV format according to a certain proportion;
comparing the pixel points with pixel points at the surrounding positions to obtain a difference value, removing the pixel points with the difference value larger than a first threshold value or smaller than a second threshold value, taking the remaining surrounding pixel points as reference pixel points, setting the number of the corresponding position, and selecting a number to replace the data of a current pixel point;
in the reference pixel point, when the difference value between a reference pixel data and the current pixel data is larger than a first threshold value or smaller than a second threshold value, a data standard is selected, and a specific number is used for replacing the data of the current pixel point.
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