中文说明：用matlab对一张图片进行DFT变换，DCT变换，比较保留20个DCT变换系数重构的图象与原始图像的差别.
English Description：
A picture is transformed by DFT and DCT with MATLAB, and the difference between the reconstructed image and the original image is compared
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中文说明：用matlab对一张图片进行DFT变换，DCT变换，比较保留20个DCT变换系数重构的图象与原始图像的差别.
English Description：
A picture is transformed by DFT and DCT with MATLAB, and the difference between the reconstructed image and the original image is compared