基于小波和阈值的矢量量化图像压缩方法

Image Compression Method of Vector Coding Based on Wavelet Transform

文章介绍一种新的矢量分类搜索算法 ,在保持较好分类效果的情况下 ,加快了码书的搜索速度 ,同时在给定失真测度的前提下 ,使码书的码元数量随不同的图像而变化 ,自适应地调整分类结果。分类完毕后对码书按照不同子带和特定顺序分级组织 ,再对相关数据进行游程编码和熵编码。实验表明 ,此方法具有很好的压缩效果和较快的计算速度。

A new vector classified searching method is proposed in this paper that can accelerate searching speed to the code book.If the distorted value is given,the number of code book vectors will vary with the differential image and the classified result is modified self_adaptively. After code book is found,the vectors are organized according to subband sequences,and then Run_Length Coding and Entropy Coding are adopted. Simulation shows better compression rate is obtained with less time_consumption.