包括最后计算压缩图像的峰值信噪比和压缩效果的源码,是学习PCA特征提取的很好的学习资料，已经调试成功.内含m文件，可直接运行。- Including the final calculation of the compressed image peak signal to noise ratio and compression of the source, Is a good learning materials to learn PCA feature extraction, Has been successful debugging. M contains files can be directly run.