Intra-frame coding and decoding method, coder and decoder

Abstract

An embodiment of the invention provides an intra-frame coding and decoding method, a coder and a decoder. The intra-frame decoding method includes: acquiring the reference pixel value of a current image block; acquiring the predicted value of the first kind of pixels in the current image block according to the reference pixel value of the current image block in an intra-frame prediction algorithm, wherein the current image includes the first kind of pixels and the second kind of pixels, and the second kind of pixels include pixels except pixels of the first kind of pixels; acquiring the residual value of the first kind of pixels according to the predicted value and the original pixel value of the first kind of pixels; obtaining conversion coefficient according to the residual value of the first kind of pixels; acquiring the quantitative conversion coefficient through quantitative coefficient conversion; reconstructing the first kind of pixels according to the e quantitative conversion coefficient and the predicted value of the first kind of pixels to obtain the reconstruction value of the first kind of pixels; acquiring the reconstruction value of the second kind of pixels according to the reconstruction value of the first kind of pixels in an interpolation method. The intra-frame coding and decoding method, the coder and the decoder can code flexibly and improve the coding efficiency.

Description

technical field [0001] The present invention relates to the field of video encoding and decoding, in particular to an intra-frame encoding and decoding method, encoder and decoder. Background technique [0002] Due to the large amount of information, video signals require high transmission network bandwidth or medium storage space. Therefore, before transmitting the video signal, it is necessary to compress and encode it, and then transmit it in order to save the transmission network bandwidth or the storage space of the medium. The main goal of video compression coding is to make the distortion of compressed and reconstructed images as small as possible under a certain bit rate (rate / bitrate). [0003] Traditional intra-frame coding usually includes multiple links such as prediction, transform, quantization, and entropy coding. Specifically, first, for an image block, according to the reconstructed Reference pixels for intra prediction (Intra prediction). Intra-frame pre...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the existing encoding method is not flexible enough and the encoding efficiency is low

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