BP神经网络的图片压缩，注释很清楚，附有测试lena图片，压缩比例已经注释了，很好用-BP neural network image compression, the notes are very clear, with the test Lena images, the compression ratio has been annotated, very easy to use!!

基于主成分分析的图像压缩，通过传入图像矩阵、主成分配置、子块大小来进行PCA处理，可得到压缩重构的图像矩阵、压缩比、贡献率信息-Image compression based on principal component analysis, by passing the image matrix, the main component configuration, the sub-block size to PCA processing, compression can be obtained

Matching Pursuit and orthogonal matching pursuit, Including compression ratio, image restoration computing uptime and peak signal to noise ratio, A relatively before correction and after correction PMUSIC.