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Define difference between rotation img and sample

Hello! I can't found a method for define difference between ratotation img and her reference (sample). For example, if we have a some artifacts (such as lines, dots or spots) - i need to find it with pinpoint accuracy! If image has a dot as one pixel - i must know about it! I have the homography transform matrix. And I use it to recovery img and after I calculate the difference between them by substract one from the other by pixels in one channel format. But opencv method "warpPerspective" has some error: each pixels has some displacement to one or two position in random direction. So I got a difference between them pixels and have a big error! Maybe anyone know how to resolve this task?