噪后经常用的评价指标，峰值信噪比，信噪比，相似度、等效视数，边缘保持指数 ENL SSIM PSNR SNR EPI

代码说明：

  包含去噪后经常用的评价指标，峰值信噪比，信噪比，相似度、等效视数，边缘保持指数(After uation often contain de-noising, the peak signal to noise ratio, SNR, similarity, ENL, edge retention index)

文件列表：

去噪评价指标ENL, SSIM, PSNR,SNR,EPI
...................................\ENL.m,175,2015-04-28
...................................\EPI.m,4439,2015-04-30
...................................\psnr.m,501,2015-08-12
...................................\snr2.m,701,2015-08-12
...................................\ssim_index.m,5911,2012-11-19