opencv形态学梯度gradient

#膨胀与腐蚀的差
#结果看上去就像前景物体的轮廓
import cv2
import numpy as np
img = cv2.imread('1.jpg',0)

#用numpy生成卷积核
kernel = np.ones((5,5),np.uint8)
gradient = cv2.morphologyEx(img, cv2.MORPH_GRADIENT, kernel)

cv2.imshow('gradient',gradient)
cv2.waitKey(0)
cv2.destroyAllWindows()