Discrete Cosine Transform in image processing -

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given vector f , scalar s difference between dct(f) , dct(f+s)

and between dct(f) , dct(f*s)

adding scalar equivalent adding zero-frequency component signal transform, you'll having larger 0th index of dct -- 'peak' if want, of value s/k k constant depending bit on particular implementation.

check out this wikibook link well.


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