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cactus1920*1080的第一帧图
1、对cactus1920*1080的第一帧图进行整个DCT变换
RGB = imread('Cactus_1920x1080_50_0_rgb.bmp');
I = rgb2gray(RGB);
J = dct2(I);
dlmwrite('test.txt', a);
imshow(log(abs(J)),[]),
colormap(jet(64)),
colorbar
2、对cactus1920*1080的第一帧图划分成8*8块大小单独做DCT变换
RGB = imread('Cactus_1920x1080_50_0_rgb.bmp');
I = rgb2gray(RGB);
dlmwrite('dct2.txt', I);
I=im2double(I);
t=dctmtx(8);
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fun = @(block_struct) ...
t * (block_struct.data) * t';
y = blockproc(I, [8 8], fun);
figure(1);imshow(log(abs(y)),[]);title('DCT系数');
dlmwrite('dct11.txt', y);
imshow(log(abs(y)),[]), colormap(jet(64)), colorbar;
具体可以参考https://blog.csdn.net/rachelkong/article/details/54376968