多项选择题
A.cv2.morphologyEx()B.cv2.morphologyGradient()C.cv2.erode()D.cv2.dilate()
A.cv2.logical_and()B.cv2.logical_or()C.cv2.logical_xor()D.cv2.logical_not()
A.cv2.filter2D()B.cv2.Sobel()C.cv2.Laplacian()D.cv2.GaussianBlur()