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Well, this seems as a classical texture analysis problem.
There are some robust texture descriptors which can be used to differenciate between the two classes without prior training... or with a simple classifier, like SVM.
Check the Haralick descriptors on the image, Gabor filters, tensors, LBP (local binary pattern) etc. and see if there is a descriptor which can differenciate the cut/uncut textures.
P.S. the OptFlow estimates the movement speed of the different areas of the image. There is a difference between the (higher) uncut and cut parts. However this depends on the distance from the camera(distant parts move slower) and the distance from the center. It's also unreliable on zones with few caracteristic points (like uniform textures).
