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I’m doing a binary thresholding on an image using opencv, while moving or animating for example a circle on a binary image, there are few noise that appears around the moveable object. An image to illustrate what I mean is attached. How can I get rid of those artifacts?
You could try to apply several cycles of the erosion algorithm (until there is only one object left) followed by same number of cycles of the dilation algorithm (the erosion/dilation pair is called opening)
See here: http://en.wikipedia.org/wiki/Mathematical_morphology