计算PSNR,可以计算变化前和变化后的图像的PSNR-Calculation of PSNR, the changes can be calculated before and after the Change Image PSNR

编程实现基于8×8子块的DCT图像变换，基于JPEG量化矩阵的量化与反量化，基于8×8子块DCT的图像重建；以一幅512×512、8比特/象素的图像为实验对象，计算重建后的PSNR。-Programming based on 8 × 8 sub-block of the DCT image transform, quantization matrix based on the JPEG quantization and anti-quantitative, based on the 8 × 8

评价图形的MSE,SNR，PSNR的GUI。-A　GUI　to evaluate the image s MSE,SNR and PSNR.