基于小波变换的简单变长编码图像压缩方法  

A new SVLC scheme for image compressing based on wavelet transform

作　　者：尚晓清[1] 宋国乡[1] 徐发国[1] 

机构地区：[1]西安电子科技大学理学院,陕西西安710071

出　　处：《西安电子科技大学学报》2002年第1期96-99,共4页Journal of Xidian University

基　　金：国家自然科学基金资助项目 (69972 0 3 4)

摘　　要：简单变长编码是一种高效的编码方法 ,在符号概率的几种分布上效率接近哈夫曼编码 ,误差不超过 1% ,且通常可用很少的比特数来传输码字 .针对哈夫曼编码软、硬件实现复杂、费时较长的缺点 ,通过对图像信号的小波分解 ,在不同的子带上采用改进的简单变长编码方案 ,获得了更高的压缩比 .结果表明 ,该算法简单有效、易于编程实现 。The SVLC(simple variable length code) scheme is very efficient. It is shown to approach the efficiency of Haffman coding for several distributions of symbol probabilities, typically within 1%. Furthermore, it is often possible to transmit the SVLC code with very few bits. Higher compressing ratio can be achieved when this coding scheme is performed in different subbands of an image decomposed by wavelet transformation. The experimental results show that this algorithm is a remarkably effective compressing scheme, having the property that it is not only efficient, but also can be easily fulfilled in software programming.

关 键 词：简单变长编码 小波变换 图像压缩 图像编码 

分 类 号：TN919.81[电子电信—通信与信息系统]