Feedback-free code rate optimization distributed video encoding and decoding method and system

Abstract

The invention discloses a feedback-free optimized code rate distributed video encoding and decoding method and a feedback-free code rate optimization distributed video encoding and decoding system. The method comprises the following steps of: 1, dividing a video sequence into a key frame K and a key frame WZ at an encoding end; 2, reconstructing the frame K in an inner-frame encoding and decoding manner, and outputting a frame K'; and 3, performing discrete cosine transformation, quantification and channel encoding on the frame WZ, generating information bit data and checking bit data, sending a selected sequence to a decoding end by a code rate optimizer according to the information bit data and the checking bit data, decoding by the decoding end according to edge information generated by the frame K and a sending sequence, and finally reconstructing the frame WZ to output a frame WZ'. By utilizing the method and the system, the quality of edge information is improved, so that the performance for reconstructing the frame WZ is improved, and the distributed video encoding scheme is simplified; and furthermore, under the condition of keeping the reconstruction quality, the encoding efficiency of distributed video encoding can be effectively improved.

Description

technical field [0001] The present invention relates to the field of video coding and decoding, in particular to a distributed video coding and decoding method and system for optimizing code rate without feedback. Background technique [0002] With the rapid development of wireless communication and terminal technology, the terminal's demand for video processing will become increasingly urgent. However, for wireless and portable terminals, it is difficult to apply high computational complexity coding technology at the sending end with limited storage, computing, and power resources (such as wireless video surveillance systems, mobile camera phones, notebooks with camera functions, etc.). [0003] Therefore, distributed video coding technology with low complexity, low power consumption, and good fault tolerance is emerging at the historic moment, which has unique technical characteristics: First, distributed video coding is quite different from traditional video coding techno...

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Problems solved by technology

[0004] In a distributed video coding system, the quality of side information has a crucial impact on the performance of distributed video coding. However, in the existing distributed video coding research results, there are no more than two ways to improve the quality of side information: One is to use various complex motion estimation algorithms at the decoding end, and then perform motion compensation on the side information to update the side information. The disadvantage of this method is that it greatly increases the complexity of the decoding end. Second, when the decoding does not achieve the required reconstruction When the demand is required, the feedback demand is sent to the encoding end, and the encoding end continuously sends additional check digits to the decoding end. The disadvantage of this method is that a feedback channel is required, which makes it difficult to apply distributed video coding to the actual video system. At the same time When the video sequence moves violently, the noise variance between the side information and the WZ frame is relatively large, and the efficiency of this method is relatively low

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