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answered 2020-05-20 03:31:40 -0600
opencv has some means of calibrating cameras, e.g. here or here but you will need the actual camera, it's not possible from images taken later
updated 2020-05-20 03:50:50 -0600
opencv has some means of calibrating cameras, e.g. here or here but you will need the actual camera, camera (and take images with a known calibration pattern, e.g. a chessboard),
it's not possible from images taken later
