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Journal of Electronic Imaging

High-quality symmetric Wyner–Ziv coding scheme for low-motion videos
Author(s): Xianfeng Ou; Enrico Masala; Linbo Qing; Xiaohai He
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Paper Abstract

Traditional Wyner–Ziv video coding (WZVC) structures require either intra (Key) or Wyner–Ziv (WZ) coding of frames. Unfortunately, keeping the video quality approximately constant implies drastic bit-rate fluctuations because consecutive frames of different types (Key or WZ) present significantly different compression performances. Moreover, certain scenarios severely limit rate fluctuation. This work proposes a WZVC scheme with low bit-rate fluctuations based on a symmetric coding structure. First, this work investigates the performance of a generic nonasymmetric distributed source coding structure, showing that the low-density parity-check accumulate channel decoding method is best suited. This is used as a basis to design a symmetric WZVC scheme in which every input video frame is divided into four parallel subframes through subsampling, and then the subframes are encoded by using a symmetric method. Compared with the traditional asymmetric WZVC scheme, the proposed scheme can achieve higher bit-rate stability over time, which is a great advantage to guarantee a reliable transmission in many wireless communication application environments in which bit-rate fluctuations are strongly constrained. Simulation results show the effectiveness of the proposed symmetric WZVC scheme in maintaining a steady bit rate and quality, as well as a quality comparison with the traditional WZVC scheme.

Paper Details

Date Published: 15 September 2014
PDF: 12 pages
J. Electron. Imag. 23(6) 061112 doi: 10.1117/1.JEI.23.6.061112
Published in: Journal of Electronic Imaging Volume 23, Issue 6
Show Author Affiliations
Xianfeng Ou, Sichuan Univ. (China)
Enrico Masala, Politecnico di Torino (Italy)
Linbo Qing, Sichuan Univ. (China)
Xiaohai He, Sichuan Univ. (China)

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