如何在OpenCV 3.1上绘制具有SIFT特征的检测对象？

import cv2
import numpy as np

image = cv2.imread('image.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

sift = cv2.xfeatures2d.SIFT_create()
keypoints, descriptors = sift.detectAndCompute(gray, None)

image_with_keypoints = cv2.drawKeypoints(image, keypoints, None)

cv2.imshow('Image with Keypoints', image_with_keypoints)
cv2.waitKey(0)
cv2.destroyAllWindows()