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ilovecg

I am just wondering how can we measure how well two images "line up"? Is there a more rigorous way to explain what is "similar" and what is "different"?

qiqinl

You may view an image with m x n pixels and 3 channels as a 3mn-dimensional vector, and performing a normal dot product can tell you the answer. :)

Andy

For vectors, we have the notion of orthogonality, which corresponds to the case when the inner product is zero. Is there also a notion of orthogonality when we consider pictures as vectors? If so, what are the visual characteristics of two orthogonal pictures?