一种基于小波变换各尺度相似性的静止图象压缩方法  

A Still Image Compression Method Based on Structural Similarity of Wavelet Transform Among Different Scales

作　　者：王平[1] 俞恒永[1] 王勇 牟轩沁[1] 

机构地区：[1]西安交通大学图象处理与识别研究所,西安710049

出　　处：《中国图象图形学报（A辑）》2000年第9期739-743,共5页Journal of Image and Graphics

摘　　要：小波变换具有良好的空间 -频率局部化性能 ,主要表现在频率压缩特性、空间压缩特性、系数分布的相似性 3个方面 ,这些特性都有利于进行图象压缩 .但是早期的小波压缩算法大多没有利用系数分布的相似性 .该文借鉴了零树算法和 Rinaldo块预测的思想 ,提出了一种新的旨在压缩重要小波系数结构性冗余的静止图象压缩方法 ,实验结果证明了这种方法的有效性 .Wavelet transform has very good spatial frequencial localization characteristics which show itself mainly at three aspects: frequency compression feature, space compression feature and structural similarity of wavelet coefficients among different scales. All these characteristics are propitious to compress still images. But classical compression methods based on wavelet transform seldom make good use of the structural similarity of significant wavelet coefficients. This paper uses the idea of zero tree compression algorithm and Rinaldo's block predicting method for reference and presents a new still image compression method to eliminate the structural redundancy of significant wavelet coefficients on different scales. The experiment results are satisfactory and prove the validity of this method.

关 键 词：图象压缩 小波变换 结构相似性 零树压缩 熵编码 

分 类 号：TN919.81[电子电信—通信与信息系统]