基于小波变换的吸引子快速图像编码

自然图像自相似性不强，直接压缩效果不佳且压缩速度慢，但图像经过行小波变换后，不同分辨率子带图像中相同空间位置的图像块、同分辨率子带中的图像块具有相似性，而分形维数基本上反映了图像灰度变化的复杂度。在图像小波子带本身相似的基础上，提出了利用分形维数作为衡量相似图像子块是否匹配的依据，并给出了编码方法。最后通过仿真证明，该方法不仅有效的压缩了图像，而且减少了编码时间。

Fast attractor image coding method based on wavelet transform

The natural image is not strongly alike,the direct compression is ineffective and compress speed is slow,when decomposed with wavelet transform,it is divided into a number of sub-images of different frequency bands,and of different spatial orientations.The neighboring sub-images of the same orientation are strongly alike.The sub-images of different orientations,though few similarities were presented between them.Because the fractal dimension basically reflect a complications for variety of the image grey scale,so fractal dimension was used to evaluate the matching degree of similar image block.It's obtained an additional increase in compression ratio and reduced the code time.