一种基于标准Walsh变换的改进SPIHT算法  

An Improved SPIHT Algorithm Based on Standard Walsh Transform

作　　者：万沛超[1] 路志宏[1] 

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《现代电子技术》2007年第14期125-126,132,共3页Modern Electronics Technique

摘　　要：在图像压缩领域,SPIHT被认为是目前最先进的嵌入式零树编码方法之一。利用SPIHT编码算法的优越性,结合Walsh变换的能够将矩阵能量向矩阵左上角集中的特点,提出了一种基于标准Walsh变换的改进SPIHT算法。仿真试验结果表明,在压缩比相同的情况下,算法的信噪比明显高于SPIHT算法信噪比。SPIHT is deemed to one of the most advanced embedded zerotree coding algorithm in the field of image compress. Using the superiority of SPIHT algorithm and the character of Walsh transformation which makes the energy of matrix to the upper left. This paper presents an improved SPIHT algorithm based on standard Walsh transform. The emulational experimental results show that,the PSNR of this algorithm is greater than that of SPIHT on the same compression ratio.

关 键 词：小波变换 图像压缩 SPIHT算法 WALSH变换 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]