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> Each 8×8 block is turned into a short DCT (Discrete Cosine Transform) feature vector; distance is measured there instead of raw pixels.<p>Was this your idea or the agent's? Because it feels peculiar to essentially describe JPEG, modulo the entropy coding, without mentioning its name. It was released in 1992 -- before C+C. Which makes me wonder why Westwood didn't just use JPEG too...<p>Fun fact, DCT's inventor: <a href="https://en.wikipedia.org/wiki/Nasir_Ahmed_(engineer)" rel="nofollow">https://en.wikipedia.org/wiki/Nasir_Ahmed_(engineer)</a>