Picture coding method and system

Abstract

The invention discloses a picture coding method and system. The method comprises the following steps: carrying out intraframe coding on macroblocks required to be coded to acquire the macroblocks of the intraframe coding; subtracting the luminance component in luminance blocks in the macroblocks of the intraframe and the luminance component in luminance blocks in the macroblocks required to be coded, subtracting the luminance component in Cr chrominance blocks in the macroblocks of the intraframe coding and the luminance component in Cr chrominance blocks in the macroblocks required to be coded, and subtracting the luminance component in Cb chrominance blocks in the macroblocks of the intraframe coding and the luminance component in Cb chrominance blocks in the macroblocks required to be coded to acquire a luminance difference block, a Cr chrominance difference block and a Cb chrominance block; coding at least one of the luminance difference block, the Cr chrominance difference block and the Cb chrominance block so as to realize additional coding on the macroblocks required to be coded; and adding an additional coding result of the macroblocks required to be coded and the macroblocks of the intraframe coding to acquire a final coding result of the macroblocks.

Description

technical field [0001] The present invention relates to the field of image processing, and more particularly relates to an image coding method and system. Background technique [0002] Currently, high-definition video images have become a trend of video display, wherein video coding standards such as H.264 and AVS are used to process high-definition video images. In image processing systems according to video coding standards such as H.264 and AVS, intra-coded pictures (I-frame pictures) are generally used as forward-prediction-coded pictures (P-frame pictures) and bidirectional predictive-coded pictures The reference picture of the picture (B-frame picture) and is stored in the reference frame memory. When decoding the P-frame picture and the B-frame picture, it is necessary to fetch the I-frame picture as the reference picture from the reference frame memory, which generally consumes relatively large bandwidth. [0003] In the process of intra-coding the reference frame ...

AI Technical Summary

Problems solved by technology

If the above-mentioned errors introduced by the intra-frame coding process are not compensated during the process of intra-coding the reference frame and / or during the decoding of the I-frame picture, and the decoding result of the I-frame picture is directly used as a reference , then the encoding error between the I frame picture and the original picture corresponding to the I frame picture will spread to between the P frame picture and the original picture corresponding to the P frame picture, and the B frame picture and the corresponding B frame picture between the original frames of the frame, which will result in objective and subjective degradation of the image quality

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