1. What is a calibration board? --Detection lens

Calibration plates are used in machine vision, image measurement, photogrammetry, 3D reconstruction and other applications to correct lens distortions for vision machines; determine the physical size and conversion relationship between pixels; and determine the 3D geometric position of a point on the surface of a space object and its presence in the image The correlation between the corresponding points requires the establishment of a geometric model of the camera imaging. By taking a camera with a fixed-pitch patterned array plate and calculating by a calibration algorithm, a geometric model of the camera can be obtained, thereby obtaining high-precision measurement and reconstruction results. The plate with a fixed pitch pattern array is the calibration plate.