How do we extract an m*n matrix from a larger p*q matrix?
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I have an image which is divided into 8*8 blocks grid. I am finding DCT of each block in this image using blocproc which is followed by idct. This gives me idct of the entire image(a matrix of 512*512 is obtained). How do I extract dct of one block(i.e. dct of a single block out of 512*512 blocks) to obtain a 8*8 matrix out of 512*512 one.
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