GOP layer coding method based on Wyner-Ziv video coding system

Abstract

The invention discloses a group-of-picture (GOP) layer coding method of a coding end in a Wyner-Ziv video coding system based on rate distortion optimization, and mainly solves the problems that the conventional code rate allocation technology cannot flexibly distribute a code rate allocation proportion of the GOP layer and cannot be applied to a practical system. The coding process comprises thefollowing steps of: estimating the relationship of a code rate allocation proportion factor k and a distortion D at the coding end; estimating the optimal proportion factor k* which meets the optimaloverall performance of a distributed video coding (DVC) system by utilizing a key frame reconfigured by the coding end and estimated side information; allocating a key frame code rate Rk and a WZ frame code rate Rwz by using the optimal proportion factor k* in the GOP; and coding the current GOP by using the key frame code rate Rk and the WZ frame code rate Rwz. By the GOP layer coding method, the optimal proportion of code rate allocation in the GOP which meets the specific distortion requirement can be flexibly determined, so that the blindness of rate allocation is avoided; distortion prediction and the code rate allocation can be performed at the coding end; and the GOP layer coding method can be applied to the practical DVC system.

Description

technical field [0001] The invention belongs to the technical field of video coding, and mainly relates to a GOP (Group-of-Picture, Group-of-Picture) layer coding method in distributed video coding based on rate-distortion optimization-based non-feedback coding rate control, which can be used in practical distributed video coding systems and A video communication system with limited terminal encoding equipment resources. Background technique [0002] With the rapid development of information technology and the Internet, multimedia has become the most important carrier for people to obtain information, and multimedia services will be the key services of wireless broadband networks in the future. According to statistics, 80% of data traffic on broadband networks in the future will be video-based multimedia data traffic. In order to adapt to the increasing development of wireless networks, more and more mobile video terminals are used in multimedia communications, such as wire...

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Problems solved by technology

Although the use of the no-feedback rate control method can basically cancel the feedback channel required in the feedback rate control without increasing or lessly increasing the complexity of the encoding end, and enhance the practicability of the DVC system, but in the traditional no-feedback In the rate control method, because the bit rate control of the top-level GOP is only based on some simple criteria, such as the correlation of adjacent images, the key frame and WZ frame bit rates in the GOP are allocated at a fixed ratio, without considering the impact of this allocation ratio on decoding recovery. The influence of the sequence quality, which leads to the blindness of the code rate allocation, and the final decoding quality cannot reach the overall optimal

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