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A simple search in the documentation gave me this http://docs.opencv.org/2.4/modules/imgproc/doc/filtering.html?highlight=sobel#cv2.Sobel

A simple search in the documentation gave me this http://docs.opencv.org/2.4/modules/imgproc/doc/filtering.html?highlight=sobel#cv2.Sobel

scale is the scaling factor for the computed derivatives while delta is the delta that can be added to the output image before it is stored. borderType should be the way the border pixels are extrapolated(I'm not a 100% sure on this)