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Pose Estimation and Feature Detection

Hi all,

I am trying to make a fiducial (QR marker) based pose estimation program which would be able to track multiple markers. I have started by building upon the OpenCV documentation example.

To do so I started by finding key points and descriptors using the SIFT algorithm. Then a used Brute Force matching to find good matches (used ratio test as well).

Now I need to use solvePnpRansac to find the pose estimation. However, as per my understanding the pose estimation algorithm requires coordinates between the real world object and 2D scene. How can I get the coordinates of the keypoints which have been matched by the SIFT algorithm?

Thanks.