多项选择题
A.cv2.fastNlMeansDenoising()B.cv2.fastNlMeansDenoisingColored()C.cv2.fastNlMeansDenoisingMulti()D.cv2.fastNlMeansDenoisingColoredMulti()
A.HOGB.SIFTC.SURFD.Canny
A.cv2.flip()B.numpy.flip()C.cv2.rotate()D.numpy.rot90()