Efficient way for SIFT descriptor matching

Question

There are 2 images A and B. I extract the keypoints (a[i] and b[i]) from them.
I wonder how can I determine the matching between a[i] and b[j], efficiently?

The ob

Answer 1

In OpenCV there are several strategies implemented to match sets of keypoints. Have a look at documentation about Common Interfaces of Descriptor Matchers.