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after convert image to binary image (black and white ) if there is any noise how can
i remove that unwanted noise
you can see below image have some white noise inside the black area how can i remove noise
using opencv
You can achieve it with Erode and Dilate.
Your image after
cvErode( in, eroded, NULL, 4):And after
cvDilate( eroded, dilated, NULL, 4):