I remember hearing about an algorithm to calculate some property of each pixel of an image which represents how noticeable that pixel is to a human, and so how likely they are to notice if that pixel was modified. I seem to remember the word sounded similar to the word "latency". Any ideas?
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What you are looking for is saliency and in the context of computer vision/image processing saliency maps provide a measure of this on a per-pixel basis.
