一种改进的分形图像压缩算法  

A Modification of Fractal Image Compression Algorithm

作　　者：罗瑞丁[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《计算机与现代化》2009年第4期30-34,共5页Computer and Modernization

摘　　要：分形图像压缩方法具有一些很好的特点,如:与分辨率无关、快速解码并且失真率非常小。但由于需要人工干预,压缩时间长,一直没有得到广泛的应用。本文针对分形编码耗时过长的不足,结合DCT变换的滤波特性与能量保持和紧缩特性,提出了一种基于离散余弦变换(DCT)的压缩技术来减少编码时间。实验结果表明,本文的方法比传统的分形编码法有着更好的压缩效果。Fractal image compression gives some desirable properties like resolution independence, fast decoding, and very competitive rate-distortion curves, but still suffers from a （ sometimes very） high encoding time, depending on the approach being used. Based on energy preservation and the compactness characteristics and the filtering characteristics of DCT（ Discrete Cosine Transform）, this thesis presents a method to reduce the encoding time of this technique by using DCT. Experimental results on standard images show that the proposed method yields superior performance over conventional fractal encoding.

关 键 词：分形 图像压缩 离散余弦变换 压缩比率 压缩时间 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]