Intra-frame prediction method, video coding method, computer equipment and storage device

A technology of intra-frame prediction and block prediction, which is applied in the field of video coding and decoding, can solve the problems of not considering the content of video images, affecting the compression rate of intra-frame coding, and high bit overhead of residual coding, so as to achieve the removal of space redundancy and bit overhead Small, the effect of improving the compression ratio

Active Publication Date: 2019-09-27
ZHEJIANG DAHUA TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present application mainly provides an intra-frame prediction method, a video coding method, computer equipment, and a storage device to solve the problem of only selecting the pixel values ​​on the upper side and the left side of the current block when obtaining the reference pixels of the current block in the traditional intra-frame prediction method. The content of the video image is not considered, which may lead to a large bit overhead of residual coding and affect the compression rate of intra-frame coding.

Method used

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  • Intra-frame prediction method, video coding method, computer equipment and storage device
  • Intra-frame prediction method, video coding method, computer equipment and storage device
  • Intra-frame prediction method, video coding method, computer equipment and storage device

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example 1

[0047] Example 1: If figure 2 As shown, in the block matching mode, the first search template uses the current block as the search template, and adopts a global search strategy, that is, starts from the upper left pixel of the current frame, and searches with the search template, and the search step size is One pixel, the search direction is first from left to right, then from top to bottom. Such as figure 2 As shown, the current block has a size of 4x4, and the reference pixel area is the coded pixel area on the upper and left sides of the current block. S1 represents the first 4x4 image block to be searched, and S2 represents the second 4x4 image block to be searched. Search in the search area from left to right and then from top to bottom with a step of one pixel, and then obtain multiple image blocks with the same size as the search template.

example 2

[0048] Example 2: If image 3 As shown, in the block matching mode, the second search template uses the current block and the area composed of all reference pixels corresponding to the current block as the search template, the number of reference lines is M=2, and a global search strategy is adopted, that is, from Start from the upper left pixel of the current frame, and search according to the search template. The search step is one pixel, and the search direction is first from left to right, then from top to bottom. Such as image 3 As shown, the current block has a size of 4x4. The search template is composed of 16 reference pixels in the current block and the left two columns of the current block and 16 reference pixels in the upper two rows. The reference pixel area is the upper and left sides of the current block. In the encoded pixel area, S1 represents the first image block to be searched, and S2 represents the second image block to be searched, and the search area is...

example 3

[0049] Example 3: If Figure 4 As shown, in the block matching mode, the third search template takes the area composed of all reference pixels corresponding to the current block as the search template, the number of reference lines M=1, and adopts a global search strategy, that is, from the current frame Start from the pixel in the upper left corner, and search according to the search template. The search step is one pixel, and the search direction is first from left to right, then from top to bottom. Such as Figure 4 As shown, the current block has a size of 4x4. The search template is composed of 8 reference pixels in the left column of the current block and 8 reference pixels in the upper row. The reference pixel area is the coded pixel area on the upper and left sides of the current block. , S1 represents the first block to be searched, and S2 represents the second block to be searched. The search is performed from left to right and then from top to bottom in the search ...

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Abstract

The invention discloses an intra-frame prediction method, a video coding method, computer equipment and a storage device. The intra-frame prediction method comprises the steps of obtaining a search template of a current block; searching a reference pixel area by adopting a search template, wherein the reference pixel area is an encoded pixel area in the current frame; respectively obtaining the matching degrees of the search template and the blocks covered by the search template in the reference pixel area; determining a minimum value in the matching degree to obtain an image block corresponding to the minimum value as an optimal matching block of the current block; and if the rate distortion cost corresponding to the optimal matching block is minimum, enabling the block matching mode corresponding to the optimal matching block to be the optimal prediction mode. By adopting the search template to search the reference pixel region, the intra-frame prediction method provided by the invention can obtain the optimal matching block by combining the image content, the brightness and the chrominance signal of the current block, so that the bit overhead of subsequent residual coding is relatively low, the compression rate of intra-frame coding is improved, and the spatial redundancy can be further removed.

Description

technical field [0001] The present application relates to the technical field of video encoding and decoding, and in particular, relates to an intra prediction method, a video encoding method, computer equipment, and a storage device. Background technique [0002] Because the data volume of video images is relatively large, it is necessary to encode and decode video images when interacting with video images. The main function of video encoding is to compress video pixel data (RGB, YUV, etc.) Data volume, to achieve the purpose of reducing network bandwidth and storage space during transmission. [0003] The video coding system is mainly divided into video acquisition, prediction, transform quantization and entropy coding. The prediction is divided into two parts: intra prediction and inter prediction, which are used to remove the redundancy of video images in space and time. [0004] The existing traditional intra prediction method, when obtaining the reference pixels of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/159H04N19/176H04N19/146
CPCH04N19/146H04N19/159H04N19/176
Inventor 江东林聚财殷俊曾飞洋方诚
Owner ZHEJIANG DAHUA TECH CO LTD
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