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My process would be: 1. find contours 2. filter contours (e.g. by area, by convexity, etc...) in order to obtain the square ones 3. pass it a rotated rectangle structure 4. rotate rectangles 5. subtract rectangles and obtain differences

My process would be: 1. be:

1. find contours 2. contours
2. filter contours (e.g. by area, by convexity, etc...) in order to to obtain the square ones 3. ones
3. pass it a rotated rectangle structure 4. structure
4. rotate rectangles 5. rectangles
5. subtract rectangles and obtain differences