UnboundLocalError: local variable 'H' referenced before assignment

[monkeycc]

Traceback (most recent call last):
  File "d:\Image-Stitching-OpenCV\Image_Stitching.py", line 92, in <module>
    main(imageA,imageB)
  File "d:\Image-Stitching-OpenCV\Image_Stitching.py", line 74, in main
    final=Image_Stitching().blending(imageA,imageB)
  File "d:\Image-Stitching-OpenCV\Image_Stitching.py", line 51, in blending
    H = self.registration(img1,img2)
  File "d:\Image-Stitching-OpenCV\Image_Stitching.py", line 31, in registration
    return H
UnboundLocalError: local variable 'H' referenced before assignment

[Narukara]

应该是因为不满足上面的 len(good_points) > min_match，匹配上的点不够多