An improved method of camera calibration

An improved calibration algorithms have been proposed in this paper. With studying Zhang´s calibration algorithm, we found that the distortion model contains only radial distortion, and the mathematical form of distortion model is not applicable. Using this model solving three-dimensional coordinates of the point in image will be calculated with greater error. The paper changed the mathematical form of the distortion model, and considered the tangential distortion, obtained a new distortion model. Experiments show that the average residual was less than 0.01mm in the calibration method, and the computing time is shorter.