Sharpening2.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))

kernel = [
            [-1, -1, -1],
            [-1, 9, -1],
            [-1, -1, -1]
]

kernel = np.array(kernel) #Normalized mean kernel

filtered = cv2.filter2D(img, -1, kernel)

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(filtered, cmap = "gray")
plt.show()