canny检索边缘轮廓

很懒所以给个代码

def canny(img):   cv2.imwrite('canny.jpg', cv2.Canny(img, 200, 300))   image = cv2.imread('canny.jpg')   cv2.imshow('canny', image)   return image   while cv2.waitKey(1) != 27:      continue   cv2.destroyWindow('canny')