cameraman=imread('cameraman.tif');
H=hadamard(256);
%hadamad矩陣
cameraman=double(cameraman)/255;
%數據類型轉換
hcameraman=H*cameraman*H;
%Hadamard變換
hcameraman=hcameraman/256;
subplot(121)
imshow(hcameraman);
title('cameraman圖像的二維離散Hadamard變換');
subplot(122)
ccameraman=dct2(cameraman);
%離散余弦變換
imshow(ccameraman);
title('cameraman圖像的二維離散余弦變換');