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OpenCV and Bundle adjustment


I have an estimate of camera internal calibration done using calibratecamera, and an estimated trajectory computed using solvepnp. The issue is that it's not accurate enough for my purpose, so I would like to refine it with bundle adjustment.

My camera is 1:1 aspect ratio and the principal point is definitely off the center.

What would you recommend? Seems like I have the options - ceres solver. I will need to write my own conversion code from/to OpenCV - cvsba: already integrated with OpenCV - others?