Side Information Generation System and Method Based on Distributed Video Coding

Abstract

The invention discloses a system and method for generating side information based on distributed video coding, which belongs to the technical field of video coding and mainly solves the problem of lack of original image information when a distributed video coding system generates side information. The method consists of four parts: correlation calculation in encoder, motion estimation in decoder, motion smoothing and motion compensation. The encoder calculates the inter-frame correlation of the original image and transmits it to the decoder; with the assistance of the correlation, the decoder uses the previous and subsequent decoded key frames to perform forward and backward motion estimation, and detects and compares the obtained motion vectors. Correction; then use overlapping block bi-directional motion estimation and motion smoothing to obtain accurate motion vectors; finally use overlapping block bi-directional motion compensation to generate side information. The invention greatly improves the subjective and objective quality of side information, further improves the quality of decoded and restored images, and can be applied to video communication systems with simple terminal equipment.

Description

technical field [0001] The invention belongs to the technical field of video coding, relates to a distributed video coding system and motion estimation, smoothing and frame interpolation by using a predecessor and a subsequent decoded key frame, and can be used in a distributed video coding system and other frame interpolation fields. Background technique [0002] Traditional video coding standards such as MPEG-X and H.26X series mainly rely on the encoder to use the statistical characteristics of the encoded signal to achieve compression encoding, resulting in the computational complexity of the encoder being 5 to 10 times that of the decoder. In recent years, some new video applications, such as wireless video sensor network, mobile video phone and wireless video surveillance, etc. are rapidly integrating and changing people's lives. However, these emerging multimedia applications put forward different requirements for the video codec system. That is, the encoder needs to ...

AI Technical Summary

Problems solved by technology

[0008] The side information generated by the interpolation of the existing search methods lacks the information of the original Wyner-Ziv frame on the encoding side, and does not use its accurate correlation with the original image of the adjacent key frame to assist the motion estimation and smoothing of the decoding side, resulting in motion at the decoding end Estimation is easy to fall into local optimization, and the searched motion vectors are not accurate enough; the motion vectors are optimized uniformly, and no separate measures are taken for unreliable motion vectors; motion compensation only uses simple mean interpolation, and the generated side information has obvious block effect

These shortcomings all affect the quality of side information generation, further affecting the rate-distortion performance of the entire system

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