如何在OpenCv中用单应矩阵拼接两幅图像？

import cv2
import numpy as np

image1 = cv2.imread('image1.jpg')
image2 = cv2.imread('image2.jpg')

gray1 = cv2.cvtColor(image1, cv2.COLOR_BGR2GRAY)
gray2 = cv2.cvtColor(image2, cv2.COLOR_BGR2GRAY)

sift = cv2.xfeatures2d.SIFT_create()
keypoints1, descriptors1 = sift.detectAndCompute(gray1, None)
keypoints2, descriptors2 = sift.detectAndCompute(gray2, None)

matcher = cv2.FlannBasedMatcher()
matches = matcher.knnMatch(descriptors1, descriptors2, k=2)

good_matches = []
for m, n in matches:
    if m.distance < 0.7 * n.distance:
        good_matches.append(m)

src_pts = np.float32([keypoints1[m.queryIdx].pt for m in good_matches]).reshape(-1, 1, 2)
dst_pts = np.float32([keypoints2[m.trainIdx].pt for m in good_matches]).reshape(-1, 1, 2)

H, mask = cv2.findHomography(src_pts, dst_pts, cv2.RANSAC, 5.0)

result = cv2.warpPerspective(image1, H, (image1.shape[1] + image2.shape[1], image1.shape[0]))
result[0:image2.shape[0], 0:image2.shape[1]] = image2

cv2.imshow('Stitched Image', result)
cv2.waitKey(0)
cv2.destroyAllWindows()