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I just got 2 Xiaomi Yi 4k+ cameras which I plan to use for RGBD input for neural network training. And got into this calibration domain. I will probably need to test multiple methods and I am interested in <1mm precision for sure.
I have found following paper: https://webserver2.tecgraf.puc-rio.br/~manuel/TeseDoutorado/ReferencePapers/HighPrecisionStereoCameraCalibration.pdf
There is also available Multi Cam Self Calibration package, which sounds promissing: https://github.com/strawlab/MultiCamSelfCal
I am interested in your results.
