sumarize11_4_2ars.m

matlab DCT 较短的程序

%载入图像
RGB = imread('autumn.tif');
figure(1);
imshow(RGB);
%将真彩图转换为灰度图
I = rgb2gray(RGB);
figure(2);
imshow(I);
%进行余弦变换
J = dct2(I);
figure(3);
imshow(log(abs(J)),[]);
colormap(jet(64));
colorbar;
%将DCT变换值小于11的元素设为0
J(abs(J)<11) = 0;
%进行余弦反变换
K = idct2(J)/255;
figure(4);
imshow(K)