说明：  1 客观评价 图像质量的客观评价是指用畸变图像偏离原始图像的误差来衡量畸变图像的质量，目前人们最常用的指标是PSNR（李英明，2011，中国图象图形学报）设 和 分别表示原始图像和待评价图像，且有 PSNR值越大，表示畸变图像 和原始图像 越接近，视觉感知越好
(An objective evaluation Objective evaluation of image quality refers to the original image distorted image deviation error to measure the distortion of the image quality, currently one of the most commonly used indicator is the PSNR (Li YM, 2011, China Image and Graphics) Let and denote the original image and pending evaluation image, and there is   PSNR greater value represents the distorted image and the original image closer, better visual perception )