机构地区: 华南理工大学电子与信息学院
出 处: 《华南理工大学学报(自然科学版)》 1999年第8期98-102,共5页
摘 要: 本文在分析了小波域内分形图象编码原理的基础上, 将零树思想引入到小波域的分形图象编码中, 通过定义方向性零( 子) 树的概念, 提出了一种小波域的分形图象编码的新算法.该算法简单实用、计算量小.实验表明, 对512 ×512 的8 比特Lena 图象在PNSR 等于29 .67 dB时, 压缩比达66 .48 , 远远优于JPEG的编码性能, Various wavelet_based fractal image coding algorithms are analyzed. A novel algorithm for wavelet_based fractal image coding is proposed through the introduction of zerotrees to wavelet_based fractal coding and the definition of oriented wavelet zerotrees(subtrees).The algorithms can achieve better coding performance in terms of PSNR and subjective quality as compared to JPEG and all of other algorithms of wavelet_fractal coding at roughly the same compression ratio.
领 域: [自动化与计算机技术] [自动化与计算机技术] [理学] [理学]