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I'm new to image processing and trying to figure out best way to identify 'moved' and 'dirty' areas between two desktop screenshots.Basically, lets say there is a round circle moving in a browser window and there is a text that is updating. The moving circle should be identified as 'moved' region (with associated bounding rectangle) and updating text should be identified as 'dirty' region (with associated bounding rectangle). There could be a multiple of dirty & moved regions so the technique should be very fast on typical computer hardware (i5 processor) and be able to hit 30+ fps. I'm open to using GPU/iGPU for speeding up the process, but at this point not sure about the right image processing algorithm.

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