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Code rate control method for distributed video coding

A distributed video and distributed technology, applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as deviation

Active Publication Date: 2015-06-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] Technical problem: For the residual coefficients of the original Wyner-Ziv (WZ) frame and the corresponding side information in the transform domain distributed video coding, there are large residuals and small residual coefficients. The statistical distribution of the residual coefficients has a certain deviation from the traditional Laplace distribution. question

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  • Code rate control method for distributed video coding
  • Code rate control method for distributed video coding
  • Code rate control method for distributed video coding

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[0041] 1) For the current decoding subband b k , each coefficient and the absolute value of its distance from the subband residual mean square form a 2-dimensional feature vector, that is, the subband bk The nth residual eigenvector in is expressed as in D b k ( μ , v ) = C R XY b x ( μ , v ) - E ( C R XY b k ) ;

[0042] 2) Use the K-Medoids clustering algorithm to divide the residual feature vector into large residual class and small residual class

[0043] ...

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Abstract

The invention discloses a method for building related noise model and estimation model parameters in distributed video coding. A hybrid model uses K-Mediods to divide residual coefficients into small residual and large residual, uses improved Laplacian distribution to describe the distribution of small residual coefficients and uses cauchy distribution to describe large residual coefficients. The hybrid model (Hybrid Distribution Correlation Noise Model, HDCNM) is capable of precisely describing the residual coefficient distribution between WZ frame and side information, and accordingly the rate-distortion performance of the transform domain distributed type video coding is effectively improved, and the computation complexity of the decoding end of a system is reduced.

Description

technical field [0001] The invention relates to a code rate control method in distributed video coding, which belongs to the field of video compression. Background technique [0002] Distributed Video Coding (DVC) is based on the information theory proposed by Slepian.Wolf and Wyner.Ziv in the 1970s, which transfers the computational complexity of the encoder to the decoder. It is characterized by simple encoding, complex decoding, compression performance close to traditional encoding methods, strong anti-error capability, and is suitable for video encoding equipment with limited resources in wireless networks. [0003] In distributed video coding, channel coding such as Turbo code or LDPC code is often used to code WZ frames. Although both Turbo codes and LDPC codes are channel coding schemes close to the theoretical world, some research results show that the overall performance of LDPC codes is better than that of Turbo codes. For videos with intense motion, the LDPC sche...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/61H04N19/625
Inventor 张登银蔡睿
Owner NANJING UNIV OF POSTS & TELECOMM