How can I extract only the compressed image from that code? (not the reconstructed one)

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Khaled
Khaled 2022-12-12
评论： Khaled 2022-12-12
I followed the link and i got the reconstructed one but i also need to extract the compressed one : https://www.mathworks.com/help/images/discrete-cosine-transform.html

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cui,xingxing
cui,xingxing 2022-12-12
Ran in:
hi, the reconstructed one is you want the compressed one.
or use B to recover origin image.
I = imread('cameraman.tif');
I = im2double(I);
T = dctmtx(8);
dct = @(block_struct) T * block_struct.data * T';
B = blockproc(I,[8 8],dct);
invdct = @(block_struct) T' * block_struct.data * T;
I_recover = blockproc(B,[8 8],invdct);
figure;
err = immse(I,I_recover)
err = 1.1837e-30
imshowpair(I,I_recover,'montage')
you see, I and I_recover are the same

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