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Detecting small differences in objects

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Hello, I am fairly new to OpenCV library and was wondering what would be the best method find small differences in two images? What I am working on is a software that detect small differences between two objects, although the compared object may not be fully completed yet, I have made two mock-ups of this and attached it below. Trying to get my program to detect that the object is the same, at the same time detecting that is is different. I am planning on mainly using matchShapes, but am worried how well it would do with real world images. But I plan to divide my object into parts starting from the bottom, and matching it with the original image. So what I am asking is if there is a method that I may have missed that you would recommend me looking. any help or ideas would be very greatly appreciated! This would be the original image: ![image description](/upfiles/14416342361909278.jpg) and this would be the compared image: ![image description](/upfiles/14416343043160282.jpg)

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