一种改进的基于零树编码的小波压缩图像算法  

An Improved Wavelet Compression Algorithm Based on Zerotree Codec

作　　者：刘利章[1] 史浩山[1] 刘晨亮[1] 

机构地区：[1]西北工业大学电子信息学院,陕西710072

出　　处：《计算机工程与应用》2005年第34期59-61,共3页Computer Engineering and Applications

摘　　要：在SPIHT算法的基础上,提出一种改进的基于零树编码的小波压缩图像编码算法。基本思想是综合了FrederickW.Wheeler和WilliamA.Pearlman提出的线性索引技术及LZC采用的标志位图,采用了与SPIHT类似的扫描顺序,与SPIHT不同的是,本文算法不用列表,硬件实现非常容易。最后经实验证明,本文算法的峰值信噪比仅比SPIHT算法略低,而对内存空间的要求则大大减少,因此在几乎没有降低恢复图像质量的前提下,使零树编码算法的硬件实现成为可能。On the base of SPHIT algorithm ,the paper implements an improved wavelet Compression algorithm based on zerotree codec.The basic idea integrates the linear indexing technique which Frederick W.Wheeler and William A. Pearlman implement and flag map which LZC adopts,uses the scan order which is same of SPIHT algorithm,unlike SPIHT,the algorithm of the paper doesn＇t adopt list,and it is very easy to accomplish on the hardware.At last, experiment testifies that the PSNR of the algorithm of the paper is nearly the same of SPIHT algorithm,but the algorithm of the paper largely decreases the need to memory space.So on the precondition of no obviously decreasing image quality,the paper makes it possible that zero codec algorithm accomplishes on the hardware.

关 键 词：SPIHT算法 LZC算法 线性索引技术 标志位图 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]