Video coding intra-frame prediction method

Abstract

The invention discloses a video coding intra-frame prediction method, which comprises the steps of: in the aspect of brightness prediction, according to image characteristics, the degree of correlation between coded pixels and coded adjacent predicted pixels and sub-adjacent coded predicted pixel information, adopting different brightness prediction modes; and in the aspect of chromaticity prediction, adopting a chromaticity intra-frame prediction mode based on sub-blocks to predict different coded sub-blocks by using different predicted pixels according to the characteristic that the degree of correlation between the pixels and the coded adjacent pixels of the current encoded sub-block is decreased with the increase of distance. By adopting the method for intra-frame prediction, the prediction is more accurate and the coding effect is improved. Not only is the intra-frame prediction method provided by the embodiment of the invention a complete intra-frame prediction system, but also each prediction mode can be separately used.

Description

technical field [0001] The present invention relates to the field of video coding, in particular to a video coding intra-frame prediction method. Background technique [0002] In video coding, intra-frame prediction is usually used to eliminate spatial redundancy of images, and inter-frame prediction is used to eliminate temporal redundancy. The coding performance of the intra-frame predicted frame is particularly important because it will also be used as a reference frame for inter-frame prediction. Based on a video source in YUV420 format, conventional intra prediction is divided into luma component prediction and chrominance component prediction. Since video sources have different image characteristics, there are areas with flat textures and simple areas and areas with complex textures and details. Based on this actual situation, conventional luminance intra-frame prediction is also divided into 16x16 luminance prediction suitable for relatively flat areas, and 4x4 lumi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to propose a video coding intra-frame prediction method, which aims to solve the problem that the existing technology ignores the characteristic that the correlation degree between the predicted pixel and the encoded adjacent pixels will decrease with the distance, and does not consider the image feature, so that when there are extremely similar areas in the video source, the spatial redundancy cannot be eliminated to the maximum extent, thus restricting the optimization of the compression performance.

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