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You'll have to experiment with methods. The exact approach is likely to depend on the specifics of exactly what kinds of variations occur and you want to ignore. Start with https://en.wikipedia.org/wiki/Image_registration and https://en.wikipedia.org/wiki/Image_differencing and SSIM and MSE, and get some experience with in what ways they do or don't need ...


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Have a look at the h.264 spec. It’s for encoding movies, so it does a lot of comparing similar images. The model is that image2 = image1, translated, with some linear transformation of the pixels.


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