I want to apply a sobel filter to an image, but I want to apply it only inside a mask I have defined. I know I can do cv2.bitwise_and and obtain only the image inside the mask, but that would also gives me an edge between the mask and the inner image that sobel would detect as a border.
So how can I apply a filter (in my case cv2.Sobel(dni,cv2.CV_64F,1,0,ksize=5)) to an that part of an image that's only inside the mask?
Thanks!