import cv2
import numpy as np
o=cv2.imread("tophat.bmp",cv2.IMREAD_UNCHANGED)
k=np.ones((5,5),np.uint8)
r=cv2.morphologyEx(o,cv2.MORPH_TOPHAT,k)
cv2.imshow("original",o)
cv2.imshow("result",r)
cv2.waitKey()
cv2.destroyAllWindows()

import cv2
import numpy as np
o=cv2.imread("blackhat.bmp",cv2.IMREAD_UNCHANGED)
k=np.ones((5,5),np.uint8)
r=cv2.morphologyEx(o,cv2.MORPH_BLACKHAT,k)
cv2.imshow("original",o)
cv2.imshow("result",r)
cv2.waitKey()
cv2.destroyAllWindows()