CN110602496B - Compression method of display system - Google Patents
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- CN110602496B CN110602496B CN201910805316.0A CN201910805316A CN110602496B CN 110602496 B CN110602496 B CN 110602496B CN 201910805316 A CN201910805316 A CN 201910805316A CN 110602496 B CN110602496 B CN 110602496B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
- H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/124—Quantisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/91—Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/93—Run-length coding
Abstract
The compression method of display system includes providing multiple compensation tables in step S10; step S20, the same rows are respectively taken out from each compensation table and sequentially and adjacently arranged, and the rows are rearranged into a total compensation table; step S30, performing a transform procedure to divide the total compensation table into a plurality of transform blocks, each of which has a size of nxn and does not overlap with each other; and step S40, quantizing and coding the transformation blocks to obtain the compensation data compression packet of the first line. Therefore, the minimum coding and decoding unit is converted from a plurality of lines into one line so as to meet the requirement of a display system and save the hardware cost.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a compression method for a display system.
Background
In the prior art, in order to eliminate the uneven brightness (Mural) phenomenon generated by the display panel, a compensation table is generally used to store compensation information of each pixel in the display panel, so as to eliminate the uneven brightness phenomenon generated by the display panel and further improve the display quality of the display panel. The display panel usually has a plurality of compensation tables, which respectively correspond to the compensation information of different color channels and different gray scales. The general compression method is composed of a plurality of links such as transformation, quantization, entropy coding and the like, wherein the links related to the transformation are DCT (discrete cosine transform), Hadamard transform and the like. The basic concept of transform is to perform frequency domain transform on an N × N transform block, and concentrate information in a low frequency region, thereby removing spatial redundancy to improve the compression rate. Theoretically, the larger the transform block, the more spatial redundancy is removed, but limited by computational resources, an 8 × 8 transform block is often used.
Conventionally, the basic unit of transformation and coding is compensation data of multiple rows of pixels, i.e. the minimum compression unit is multiple rows of data, and hardware design requires at least multiple line buffers (line buffers) for buffering multiple rows of data, which greatly increases hardware cost and defeats the original purpose of cost reduction algorithm. Moreover, if the transform block size is reduced blindly, for example, by changing the number of lines from 8 to 4, the compression effect is reduced. Therefore, there is a need to provide a compression method for a display system to solve the problems of the prior art.
Disclosure of Invention
The present invention is directed to a compression method for a display system, which transforms a minimum codec unit from a plurality of rows to a single row to meet the requirement of the display system and save the hardware cost.
To achieve the above object, the present invention provides a compression method for a display system, comprising the steps of step S10, providing a plurality of compensation tables; step S20, extracting the same rows from each compensation table to be sequentially and adjacently arranged, and rearranging the rows to form a total compensation table; step S30, performing a transform procedure to divide the total compensation table into a plurality of transform blocks, each of which has a size of nxn and does not overlap with each other; and step S40, quantizing and coding the transformation blocks to obtain the compensation data compression packet of the first line.
In step S10, the compensation tables correspond to the compensation data of the pixels in different colors and different gray scales, respectively.
In an embodiment of the invention, on a single auxiliary cathode, when the resolution of the display system is 3840 × 2160 pixels, the number of the compensation tables is 12, wherein each color is red (R), green (G) and blue (B), and each gray scale is the first gray scale, the second gray scale, the third gray scale and the fourth gray scale.
In an embodiment of the present invention, in the process of rearranging the total compensation table, the first row of the total compensation table is taken from the first rows of the compensation tables corresponding to the red and the first gray scales, the second row of the total compensation table is taken from the first rows of the compensation tables corresponding to the red and the second gray scales, the third row of the total compensation table is taken from the first rows of the compensation tables corresponding to the red and the third gray scales, the fourth row of the total compensation table is taken from the first rows of the compensation tables corresponding to the red and the four gray scales, and so on, so as to arrange the total compensation table in which the rows of different gray scales of different colors are adjacent.
In an embodiment of the present invention, in rearranging said global compensation table, a first row of said global compensation table is taken from a first row of said compensation table for said red and said first gray scale, a second row of said global compensation table is taken from a first row of said compensation table for said green and said first gray scale, a third row of said global compensation table is taken from a first row of said compensation table for said blue and said first gray scale, a fourth row of said global compensation table is taken from a first row of said compensation table for said red and said second gray scale, and so on, thereby arranging adjacent lines of said global compensation table for different colors of the same gray scale.
In an embodiment of the present invention, a twelfth row of the total compensation table is a first row of the compensation table corresponding to the blue and the fourth gray levels, wherein thirteenth to sixteenth rows of the total compensation table copy the contents of the twelfth row to complete 16 rows.
In an embodiment of the present invention, a twelfth row of the total compensation table is a first row of the compensation table corresponding to the blue and the fourth gray levels, wherein thirteenth to sixteenth rows of the total compensation table copy the contents of the twelfth row to complete 16 rows.
In step S30, in one embodiment of the present invention, the total number of rows in the total compensation table is an integer multiple of N of the transform block, and when the product of each color and each gray scale is not an integer multiple of N, the last row of the total compensation table is copied until the total number of rows is an integer multiple of N.
In an embodiment of the invention, in step S40, the transform mode is a discrete cosine transform, a discrete sine transform or a hadamard transform, and the coding is huffman coding, run-length coding or arithmetic coding.
In an embodiment of the present invention, in step S30, the transform block size of each row of the total compensation table is rearranged, where the transform block size is an integer multiple of N, and the transform block size is 8 × 8 or 16 × 16.
The invention also has the following effects that a plurality of compensation tables are rearranged to form a total compensation table, so that the compensation data of the same pixel in various gray scales and colors have similarity, the redundancy removing effect of transformation and coding can be ensured, the occupation of memory space is effectively reduced, the hardware resource of the system is saved, and the hardware cost is reduced.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a compression method of the display system of the present invention;
FIG. 2 is a schematic diagram of a compression method of the display system of the present invention for rearranging data;
FIG. 3 is a schematic diagram of the compression method of the display system of the present invention divided into a plurality of transform blocks of size N;
FIG. 4A is a schematic diagram of an arrangement of data in a global offset table in the compression method of the display system of the present invention;
and
FIG. 4B is a schematic diagram of another arrangement of the total compensation table in the compression method of the display system of the present invention.
Detailed Description
Reference in the detailed description to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the same phrases in various places in the specification are not necessarily limited to the same embodiment, but are to be construed as independent or alternative embodiments to other embodiments. In light of the disclosure of the embodiments provided by the present invention, it should be understood by those skilled in the art that the embodiments described in the present invention can have other combinations or variations consistent with the concept of the present invention.
Referring to fig. 1 to 3, the present invention provides a compression method of a display system, comprising the steps of providing a plurality of compensation tables 1 in step S10; step S20, extracting the same row 11 from each compensation table 1 to be sequentially and adjacently arranged, and rearranging the rows to form a total compensation table 2; step S30, performing a transform procedure to divide the total compensation table 2 into a plurality of transform blocks 3, each of the transform blocks 3 having a size of N × N and not overlapping each other; and step S40, quantizing and coding the plurality of transformation blocks 3 to obtain the compensation data compression packet of the first line.
In step S10, the compensation tables 1 correspond to compensation data of pixels (not shown) in different colors and different gray scales, respectively. Generally, an OLED display system will have 18 to 24 compensation sheets in Table 1, corresponding to three colors (R, G, B) or four colors (W, R, G, B) and four to six gray scale values, respectively. When the resolution of the display system is 3840 × 2160 pixels, 12 compensation tables 1 are provided, wherein each of the colors is red (R), green (G), and blue (B) or red (R), green (G), blue (B), and white (W), and each of the grayscales is a first grayscale, a second grayscale, a third grayscale, and a fourth grayscale, such as (32, 64, 128, 192).
In the following description taking R, G and B as an example, referring to FIG. 2, in the process of rearranging the total offset table 2 in step S20, the first row of said total compensation table 2 is taken from the first row 11 of said compensation table 1 corresponding to said red R and said first gray level (32), the second row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the red R and the second gray level (64), the third row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the red R and the third gray level (128), the fourth row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the red R and the four gray levels (192), and so on …, thereby arranging the total compensation table 2 of the adjacent rows of different gray scales of different colors as shown in fig. 4A.
However, in the embodiment of the present invention shown in fig. 4B, the rearrangement of the total compensation table 2 further includes that the first row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the red R and the first gray scale (32), the second row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the green G and the first gray scale (32), the third row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the blue B and the first gray scale (32), the fourth row of the total compensation table 2 is taken from the first row 11 of the compensation table 1 corresponding to the red R and the second gray scale (64), and so on …, thereby arranging the adjacent rows of the same different colors of the total compensation table 2 as shown in fig. 4B.
In FIG. 4A, the twelfth row of the total compensation table 2 is the first row 11 of the compensation table 1 corresponding to the blue B and the fourth gray level (192), wherein the thirteenth through sixteenth rows of the total compensation table 2 duplicate the contents of the twelfth row, completing 16 rows. In FIG. 4B, the twelfth row of the total compensation table 2 is the first row 11 of the compensation table 1 corresponding to the blue B and the fourth gray scale (192), wherein the thirteenth to sixteenth rows of the total compensation table copy the content of the twelfth row to complete 16 rows, so as to meet the requirements of the display system and save the hardware cost.
In step S30, the total number of rows in the total compensation table 2 is an integer multiple of N of the transform block 3. When the product of each color and each gray scale is not an integer multiple of N, the last row of the total compensation table 2 is copied until the total row number is an integer multiple of N, so as to conform to the arrangement of the present embodiment. As shown in fig. 3, the size of the transform block 3 in which each row of the total compensation table 2 is an integer multiple of N is rearranged, wherein the size of the transform block 3 is 8 × 8, 16 × 16, or other suitable values.
In step S40, the transform blocks 3 are quantized and encoded again, the transform mode is Discrete Cosine Transform (DCT), Discrete Sine Transform (DST), or Hadamard transform (Hadamard transform); the coding is Huffman coding, run-length coding or arithmetic coding, and the required quantization or coding method is changed according to the requirement.
The present invention divides the total compensation table 2 into 8 × 8 or 16 × 16 transform blocks 3 which do not overlap with each other, and performs, for example, DCT transform, quantization, and arithmetic coding to obtain the compensation data compression packet of the first row. When decompressing, decoding, inverse quantization and inverse transformation are carried out to obtain N lines of pixel data, and the N lines of pixel data are rearranged into the first line, so that the method is applied to a display system. Therefore, by rearranging a plurality of compensation tables 1 into a total compensation table 2, the compensation data of the same pixel in various gray scales and colors have similarity, thereby ensuring the redundancy removing effect of transformation and coding, effectively reducing the occupation of memory space, saving the hardware resources of the system and reducing the hardware cost.
In view of the foregoing, while the present invention has been described in conjunction with specific embodiments thereof, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.
Claims (9)
1. A method of compression of a display system, comprising:
s10, providing a plurality of compensation tables, wherein the compensation tables respectively correspond to the compensation data of the pixels in a plurality of different colors and different gray scales;
s20, taking out the same rows from each compensation table to be arranged adjacently in sequence, and rearranging to form a total compensation table, wherein the rows of different gray scales with different colors can be arranged adjacently to form the total compensation table, or the rows of different gray scales with different colors can be arranged adjacently to form the total compensation table, and the sequential adjacent arrangement means that the first row in the first compensation table is used as the first row of the total compensation table, the first row in the second compensation table is the second row of the total compensation table, and so on;
s30, a transformation program is carried out, the total compensation table is divided into a plurality of transformation blocks, and the size of each transformation block is NxN and the transformation blocks are not overlapped; and
and S40, quantizing and coding the plurality of transformation blocks to obtain a compensation data compression packet.
2. The compression method for a display system according to claim 1, wherein when the resolution of the display system is 3840 × 2160 pixels, the number of the compensation tables is 12, wherein each of the colors is red (R), green (G) and blue (B), and each of the grayscales is the first grayscale, the second grayscale, the third grayscale and the fourth grayscale.
3. The compression method for a display system according to claim 2, wherein in rearranging said total compensation table, a first row of said total compensation table is taken from first rows of said compensation tables corresponding to said red and said first gray scales, a second row of said total compensation table is taken from first rows of said compensation tables corresponding to said red and said second gray scales, a third row of said total compensation table is taken from first rows of said compensation tables corresponding to said red and said third gray scales, a fourth row of said total compensation table is taken from first rows of said compensation tables corresponding to said red and said four gray scales, and so on, thereby arranging said total compensation tables adjacent to each of said rows of different gray scales of different colors.
4. The compression method for a display system according to claim 2, wherein in rearranging said total compensation table, a first row of said total compensation table is taken from first rows of said compensation tables for said red and said first gray scales, a second row of said total compensation table is taken from first rows of said compensation tables for said green and said first gray scales, a third row of said total compensation table is taken from first rows of said compensation tables for said blue and said first gray scales, a fourth row of said total compensation table is taken from first rows of said compensation tables for said red and said second gray scales, and so on, thereby arranging said total compensation tables adjacent to each of said rows for different colors of the same gray scale.
5. The compression method for a display system according to claim 3, wherein a twelfth row of said total compensation table is a first row of said compensation table corresponding to said blue and said fourth gray levels, wherein a thirteenth to sixteenth rows of said total compensation table copy contents of said twelfth row, completing 16 rows.
6. The compression method for a display system according to claim 4, wherein a twelfth row of said total compensation table is a first row of said compensation table corresponding to said blue and said fourth gray levels, wherein a thirteenth to sixteenth rows of said total compensation table copy contents of said twelfth row, completing 16 rows.
7. The compression method of a display system according to claim 1, wherein in step S30, the total number of rows of the total compensation table is an integer multiple of N of the transform block, and when the product of each of the colors and each of the gray levels is not an integer multiple of N, the last row of the total compensation table is copied until the total number of rows is an integer multiple of N.
8. The compression method of the display system according to claim 1, wherein in step S40, the transform mode is discrete cosine transform, discrete sine transform or hadamard transform, and the coding is huffman coding, run length coding or arithmetic coding.
9. The compression method of the display system according to claim 1, wherein in step S30, the total number of rows of the rearranged total compensation table is an integer multiple of N of the transform block, wherein the transform block has a size of 8 x 8 or 16 x 16.
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| CN102663976A (en) * | 2010-11-15 | 2012-09-12 | 伊格尼斯创新公司 | System and method for compensation of non-uniformities in light emitting device displays |
| CN108196793A (en) * | 2017-12-29 | 2018-06-22 | 武汉华星光电半导体显示技术有限公司 | The data compression method and decompression method of DeMura tables |
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