Where calibration starts.
ChArUco vs checkerboard vs AprilGrid: which one, when Three patterns cover almost every calibration job. The right one depends on how much of the board your camera can see, how wide the lens is, and which software reads the result. 8 min Composite, ceramic or glass: picking a substrate Flatness, thermal expansion, cost and field of view — when each material is the right call. 7 min Why your printed target is costing you 0.5 px Paper stretches, inkjets scale, foam board bows. What that does to reprojection error, measured. 6 min