基于小波变换的分形预测图象编码方法

Wavelet Based Fractal Predictive Image Coding

提出一种把小波图象编码与分形图象编码相结合的新的编码方法。图象经过小波分解后，呈现出两种相似性：一种是子图象本身的自相似性，一种是同方向不同分辨率子图象之间的互相似性。利用第二种相似性，也即利用低分辨率子图象对同方向高分辨率子图象进行分形预测编码。由于小波分解后低分辨率子图象的范围比高分辨率子图象的范围小一倍，故该编码方法较一般的分形编码方法大大缩短了编码的时间；就编码的效果而言，该方法也比较令人满意。最后提供了在标准图象上的实验结果。

This paper presents a new image coding scheme which integrates the wavelet image coding and the fractal image coding together. There are two similarities emerging after an image has been decomposed with wavelet transform, one is the self similarity of each subimage and the other is the co similarity between the subimages with the same orientation at different resolution. It is the co similarity that we make use of in our scheme. The experimental results provided in this paper justifies the good performance as well as efficiency of our scheme.