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How to calibrate two cameras whose field of View is 180 deg apart

I have two cameras which are fixed back to back and they view exactly opposite directions. How can I calibrate them.

Options which I could think of (by adding intermediate cameras with overlapping views):

  1. Multi camera calibration: Bo LI IROS 2013
  2. Pairwise Stereo calibration with checker board

Ha s anyone solved this problem?

How to calibrate two cameras whose field of View is 180 deg apart

I have two cameras which are fixed back to back and they view exactly opposite directions. How can I need to find the extrinsics between the two cameras. They dont have fish eye lenses. The cameras are two primesense RGBD sensors. I am trying to calibrate them.the two RGB cameras or two IR cameras in the respective sensors

Options which I could think of (by adding intermediate cameras with overlapping views):

  1. Multi camera calibration: Bo LI IROS 2013
  2. Pairwise Stereo calibration with checker board

Ha s anyone solved this problem?