Munawwar

import numpy as np
import cv2

def getSobel (channel):

    sobelx = cv2.Sobel(channel, cv2.CV_16S, 1, 0, borderType=cv2.BORDER_REPLICATE)
    sobely = cv2.Sobel(channel, cv2.CV_16S, 0, 1, borderType=cv2.BORDER_REPLICATE)
    sobel = np.hypot(sobelx, sobely)

    return sobel;