laplacian.py

import numpy as np
import cv2
from matplotlib import pyplot as plt
img = cv2.imread("imgs/chapter5/sudoku.png", 0); 
img = cv2.blur(img, (3, 3));
laplacian = cv2.Laplacian(img,cv2.CV_8UC1)  #Binarized
f = plt.figure(figsize=(15,15))
f.add_subplot(1, 2, 1).set_title('Original Image');
plt.imshow(img, cmap = "gray")
f.add_subplot(1, 2, 2).set_title('Filtered Image');
plt.imshow(robert_filter, cmap = "gray");
plt.show();