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I got a error "Incorrect type of self (must be 'Feature2D' or its derivative)" from line7(keypoints~~)

import cv2 as cv import numpy as np

im = cv.imread("mini.jpg", cv.IMREAD_GRAYSCALE)

detector = cv.SimpleBlobDetector() keypoints = detector.detect(im) im_with_keypoints = cv.drawKeypoints(im, keypoints, np.array([]), (0,0,255), cv.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)

cv.imshow("keypoints", im_with_keypoints) k = cv.waitKey(0) cv.destroyAllWindows()

I got a error "Incorrect type of self (must be 'Feature2D' or its derivative)" from line7(keypoints~~)

import cv2 as cv import numpy as np

im = cv.imread("mini.jpg", cv.IMREAD_GRAYSCALE)cv.IMREAD_GRAYSCALE) detector = cv.SimpleBlobDetector() keypoints = detector.detect(im) im_with_keypoints = cv.drawKeypoints(im, keypoints, np.array([]), (0,0,255), cv.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS)cv.DRAW_MATCHES_FLAGS_DRAW_RICH_KEYPOINTS) cv.imshow("keypoints", im_with_keypoints) k = cv.waitKey(0) cv.destroyAllWindows()cv.destroyAllWindows()