import cv2
import numpy as np
from scipy import ndimage

kernel_3x3 = np.array([[-1, -1, -1],
                       [-1,  8, -1],
                       [-1, -1, -1]])

kernel_5x5 = np.array([[-1, -1, -1, -1, -1],
                       [-1,  1,  2,  1, -1],
                       [-1,  2,  4,  2, -1],
                       [-1,  1,  2,  1, -1],
                       [-1, -1, -1, -1, -1]])

img = cv2.imread("../images/statue_small.jpg",
                 cv2.IMREAD_GRAYSCALE)

k3 = ndimage.convolve(img, kernel_3x3)
k5 = ndimage.convolve(img, kernel_5x5)

blurred = cv2.GaussianBlur(img, (17, 17), 0)
g_hpf = img - blurred

cv2.imshow("3x3", k3)
cv2.imshow("5x5", k5)
cv2.imshow("blurred", blurred)
cv2.imshow("g_hpf", g_hpf)
cv2.waitKey()
cv2.destroyAllWindows()