对图像傅里叶变换，DCT变换及重构并求均方误差

clc; clear; close all; load woman.mat; a1=fft2(double(X)); a2=ifft2(a1); b1=dct2(double(X)); b2=idct2(b1); fmse=qmse(a2,X); dmse=qmse(b2,X); figure(1) subplot(1,3,1);imshow(uint8(X));title('原图像'); subplot(1,3,2);imshow(uint8(a2));title('傅立叶重构图像'); subplot(1,3,3);imshow(uint8(b2));title('DCT重构图像');