基于小波变换的JPEG压缩算法研究  

Research on JPEG Compression Algorithm Based on Wavelet Transforms

作　　者：熊斌[1] 

机构地区：[1]成都理工大学工程技术学院自动化系,四川乐山614007

出　　处：《计算机与现代化》2009年第8期140-143,共4页Computer and Modernization

摘　　要：基于DCT变换的JPEG压缩算法在低比特率压缩时容易产生方块效应,严重影响解码图像的视觉效果。主要原因是DCT变换丢失的高频信息较多,本文尝试对其进行改进。主要方法是用小波变换代替JPEG算法中的DCT模块,并用MATLAB对其进行了仿真分析,取得了较好的视觉效果。JPEG compression algorithm based on DCT transform produces the diamonds effect when working at low bit rate trans- form, and it influences the vision effect of decoding image badly. The main reason is the DCT transform lose too many high fre- quency information, so this article tries to improve it. And the main methods is to replace the DCT module in JPEG arithmetic with wave transform, moreover simulates and analyzes it with MATLAB language, and obtaines a better vision effect.

关 键 词：小波变换 JPEG DCT编码 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]