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A Bit Rate Control Method for Non-Feedback Distributed Video Coding

A distributed video and rate control technology, applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve problems such as limiting the application of DVC video communication system, increasing system complexity and delay, and improving rate distortion. The effect of performance and small amount of calculation

Active Publication Date: 2018-04-10
NANJING UNIV OF POSTS & TELECOMM
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  • Application Information

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Problems solved by technology

This feedback mechanism-based code rate control method can improve coding efficiency, but it also greatly increases the complexity and delay of the entire system, which limits the application of DVC video communication systems

Method used

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  • A Bit Rate Control Method for Non-Feedback Distributed Video Coding
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  • A Bit Rate Control Method for Non-Feedback Distributed Video Coding

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Embodiment Construction

[0026] The present invention will be further exemplified and described below in conjunction with the accompanying drawings and specific embodiments.

[0027] figure 1 It is a system frame diagram of the present invention. The present invention considers adding a code rate control module at the decoding end of distributed video coding, and the specific implementation method of this module is as follows: figure 2 shown. The specific implementation steps are as follows:

[0028] ① Source WZ frame X t and adjacent keyframe X b and x f The DCT transformation of 4*4 blocks is carried out respectively, and 16 coefficient bands are generated.

[0029] ② Use the formula

[0030] in, and Respectively represent the value on the corresponding WZ frame and the key frame of the kth coefficient band of the DCT domain; M and N represent the length and width of the frame respectively; B is the block size of the DCT transformation, and B=4 in the present invention. Calculate sour...

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Abstract

The invention discloses a code rate control method for non-feedback distributed video coding, which mainly solves the problem of realizing code rate control of Wyner-Ziv frames at the coding end in a non-feedback distributed video coding system. The method is to add a code rate control module at the encoding end, which includes two parts: (1) Calculate the correlation between the source WZ frame and the adjacent key frames in the DCT domain of each coefficient band, and select the quantization matrix according to the correlation coefficient; (2) Perform low-complexity side information estimation and bit-plane code rate allocation. The method of the invention realizes the control of code rate on the basis of ensuring the low computational complexity of the coding end, and reduces the complexity and decoding time delay of the decoding end.

Description

technical field [0001] The invention relates to a code rate control method of a coding end of a non-feedback distributed video coding, and belongs to the field of distributed video coding. Background technique [0002] The traditional video encoding method is to perform complex motion estimation at the encoding end to remove the time redundancy of adjacent video frames, resulting in much higher computational complexity at the encoding end than at the decoding end. This encoding method is not conducive to low-power encoding implementation of the device. In order to solve the above problems, based on the lossless coding theory of Slapian and Wolf and the lossy coding theory of Wyner and Ziv, a Distributed Video Coding (DVC, Distributed Video Coding) technology is produced. At present, the typical distributed video coding system is the transform domain-based Wyner-Ziv video coding system proposed by Stanford University's Bernd Girod et al., and the transform domain-based PRISM...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/146H04N19/147H04N19/124H04N19/30H04N19/625
Inventor 马腾张登银王雪梅
Owner NANJING UNIV OF POSTS & TELECOMM