Distributed video coding and decoding method based on wavelet domain residual errors

Abstract

The invention provides a distributed video coding and decoding method based on wavelet domain residual errors. An inter-frame predictor at a coding end obtains the prediction frame F'(t) of a current frame F (t); after wavelet conversion is carried out to the F (t) and F'(t), difference is respectively carried out to each frequency band, thus obtaining residual error information Res; quantification, bit plane extraction and channel coding are carried out to the Res; the main process at a decoding end comprises following steps of obtaining the initial motion vector MVn of the nth layer of the F(t); respectively carrying out motion compensation to the other frequency bands of the nth layer of a reference frame F'(t-1), thus obtaining the frequency band side information of the nth layer of the F(t); respectively carrying out difference to the side information and the other frequency bands of the nth layer of the F'(t); after carrying out channel decoding and residual error reconstruction to the residual error information of the nth layer, carrying out summation to the residual error information of the nth layer of the F(t) and the frequency bands of the nth layer of the F'(t) , thus obtaining the frequency band information of the nth layer of the F(t); finally, carrying out wavelet conversion to the four frequency bands of the nth layer of the F(t), thus obtaining the lowest frequency band LLn-1(t) of the n-1th layer, and decoding an n-1 layer until outputting the current frame.

Description

technical field [0001] The invention relates to the problem of distributed video coding and decoding in the field of image communication, in particular to a distributed video coding and decoding method of wavelet domain residual at low code rate. Background technique [0002] In recent years, with the rapid development of digital video applications, digital video applications continue to develop in the direction of high definition, high frame rate, and high compression rate. The limitations of the current mainstream video compression standard protocol H.264 / AVC have become increasingly prominent. In 2003, a new generation of video compression coding protocol HEVC with higher definition, higher frame rate, and higher compression rate came into being. Compared with the mainstream H.264 standard, under the same rate-distortion condition, the compression rate of HEVC is nearly double that of H.264. However, the high compression rate of HEVC comes at the cost of sacrificing the ...

AI Technical Summary

Problems solved by technology

However, the current DVC system based on DWT does not fully consider the model of the image source, so the coding rate is not much improved compared with the typical DCT domain DVC, and the coding rate is still high

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