Problem 2: Sometimes we see it sometimes we don't

We humans are a little quirky in that we are not completely consistent. One time we may notice a difference between two images, but other times we may not. The is especially noticeable for things that are barely visible. Often times we won't see them even though they are just as much there as other times when we do see them. On the other hand, machines are designed so that given the same input they consistently produce the same output. In order to account for this variability in humans, we modify our question to now be: "For a particular image block, what is the probability of noticing a difference between the printed image and the ideal print?"

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