基于小波域的两阶段多描述图像编码

doi:10.3969/j.issn.1000-3428.2012.19.053

计算机工程 ›› 2012, Vol. 38 ›› Issue (19): 206-209.doi: 10.3969/j.issn.1000-3428.2012.19.053

基于小波域的两阶段多描述图像编码

王红艳^1a，金炜东^1b，万小磊²

(1. 西南交通大学 a. 信息科学与技术学院；b. 电气工程学院，成都 610031；2. 南阳理工学院，河南南阳 473000)

收稿日期:2011-12-08 出版日期:2012-10-05 发布日期:2012-09-29
作者简介:王红艳(1986－)，女，硕士研究生、CCF会员，主研方向：图像压缩编码，智能信息处理；金炜东，教授、博士生导师；万小磊，讲师、硕士
基金项目:
国家自然科学基金资助项目(60971103)

Two-stage Multiple Description Image Coding Based on Wavelet Domain

WANG Hong-yan^1a, JIN Wei-dong ^1b, WAN Xiao-lei ²

(1a. School of Information Science and Technology; 1b. School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Nanyang Institute of Techonology, Nanyang 473000, China)

Received:2011-12-08 Online:2012-10-05 Published:2012-09-29

摘要/Abstract

摘要： 为加强图像在不可靠网络上传输的鲁棒性，提出基于小波域的两阶段图像多描述编码方案。第1阶段对原始图像经小波变换后的系数进行SPIHT编码，形成第1部分描述；第2阶段对SPIHT编码后的系数进行解码，与原始小波系数作差分，实现差值信号的四叉树抽样，通过SPIHT编码形成第2部分描述。将2部分描述复制并同步传送到两信道中。实验结果表明，该方案冗余调节方便，编码后的数据流能适应各种网络传输状况。

关键词: 图像编码, 小波域, 两阶段结构, 多描述编码, 冗余, 边路, 中心路

Abstract: To improve the robustness of image transmission on unreliable networks, this paper presents a two-stage multiple description image coding scheme based on wavelet domain. In the 1st stage, the wavelet coefficients of the original image are coded with Set Partitioning in Hierarchical Trees(SPIHT) coding algorithm, which form the first part of the descriptions. In the 2nd stage, the coefficients are decoded after the SPIHT coding, and it makes difference with the original wavelet coefficients. The difference signal are sampled by the quadtree method, and coded with SPIHT algorithm in the bit rate, which form the second part of the descriptions. Two parts of descriptions are copied and synchronize delivered to two channels. Experimental results show that this scheme can adjust redundancy conveniently, and the encoded data stream is more resilient for usual packet loss situation over different networks.

Key words: image coding, wavelet domain, two-stage structure, Multiple Description Coding(MDC), redundancy, side channel, center channel

中图分类号:

TN919.81

王红艳, 金炜东, 万小磊. 基于小波域的两阶段多描述图像编码[J]. 计算机工程, 2012, 38(19): 206-209.

WANG Gong-Yan, JIN Wei-Dong, MO Xiao-Lei. Two-stage Multiple Description Image Coding Based on Wavelet Domain[J]. Computer Engineering, 2012, 38(19): 206-209.

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基于小波域的两阶段多描述图像编码

Two-stage Multiple Description Image Coding Based on Wavelet Domain

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