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 Checkerboard calibration plate, the 200x200 correction sheet, calibration plate, the calibration plate design total length accuracy: ± 3.0μm; graphics dimensional accuracy: ± 1.0 to ± 3.0μm graphics positional accuracy: ± 1.0μm ~ ± 3.0μm line accuracy: ± 1μm; calibration plate (Calibration Target) applications in machine vision, image measurement, photogrammetry, 3D reconstruction, for the correction of lens distortion; determine the conversion relationship between the physical size and pixel; identification of space objects at a point on the surface of the three-dimensional geometry positions in relationship between corresponding points in the image, the need to create a geometric model of the camera imaging. Through the camera with a the fixed pitch pattern array tablet, calibrated calculation of the algorithm, we can draw the geometric model of the camera, resulting in high-precision measurement and reconstruction results. Tablet with a fixed spacing pattern array calibration plate (calibration template Calibration Target). Camera calibration technology needs accurate camera parameters and external parameters as input and prerequisites of the reconstruction algorithm, currently the most popular camera calibration algorithm is proposed by Tsai in 1987 [Tsai1987] Tsai method with a non-coplanar dedicated calibration identification of three-dimensional calibration object to provide a point corresponding image point and the corresponding three-dimensional space and calculate the calibration parameters. Zhang made in 1999 another practical method [Bouguet2007] is, this method needs to be calibrated at least two different views of the calibration pattern on a plane. Caltech camera calibration tools are made effective realization of the above two methods, and has been integrated into Intel's vision algorithms library OpenCV [OpenCV2004]. By the calibration algorithm, the camera projection matrix can be calculated, and the scene information of three-dimensional measure. In the case of not given real scene absolute translation, rotation, and zoom parameters, can reach the measure of the level of similarity transform Reconstruction. One three three eight zero one nine four one nine zero buttoned two eight two five nine one zero one December