计算机工程 ›› 2012, Vol. 38 ›› Issue (01): 273-275.doi: 10.3969/j.issn.1000-3428.2012.01.090

• 开发研究与设计技术 • 上一篇    下一篇

DVC中基于DCT系数统计特性的量化算法

莫望华,杨春玲   

  1. (华南理工大学电子与信息学院,广州 510641)
  • 收稿日期:2011-05-20 出版日期:2012-01-05 发布日期:2011-01-05
  • 作者简介:莫望华(1987-),男,硕士研究生,主研方向:分布式视频编码;杨春玲,教授、博士
  • 基金项目:
    国家自然科学基金资助项目(60972135);中央高校基本科研业务费专项基金资助项目(2009ZM0231);“现代信息科学与网络技术”重点实验室暨铁道部“铁路信息科学与工程”开放实验室开放基金资助项目(XDXX1009)

Quantization Algorithm Based on Statistical Characteristics of DCT Coefficients in Distributed Video Coding

MO Wang-hua, YANG Chun-ling   

  1. (School of Electronic and Information, South China University of Technology, Guangzhou 510641, China)
  • Received:2011-05-20 Online:2012-01-05 Published:2011-01-05

摘要: 针对变换域分布式视频编码问题,提出一种自适应量化算法AQSC。根据视频帧离散余弦变换系数的分布特点,确定各子带的重要性,只对重要的子带进行量化及编解码,不重要的子带不进行量化及编码,且在译码时直接用边信息代替。实验结果表明,AQSC算法可提高分布式视频编码系统的率失真性能,减少译码码率,解码后视频序列的整体质量有所提高。

关键词: 变换域Wyner-Ziv视频编码, 分布式视频编码, 离散余弦变换, DCT系数统计特性, 子带分组, 自适应量化

Abstract: This paper proposes an adaptive quantization algorithm named AQSC in transform-domain Distributed Video Coding(DVC). Only the important Discrete Cosine Transform(DCT) bands determined by the statistical characteristics of DCT coefficients are quantized and coded, while the less important ones are not quantized and coded, but replaced directly by the side information in the decoder side. Experimental results show that AQSC achieves rate-distortion improvements and reduces the decoding rates, compared to IST-TDWZ scheme.

Key words: transform-domain Wyner-Ziv video coding, Distributed Video Coding(DVC), Discrete Cosine Transform(DCT), statistical characteristics of DCT coefficients, sub-band grouping, adaptive quantization

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