CCD camera linear calibration method with a feature of calibration plate

In this paper, we present an algorithm for the camera linear calibration after considering the lens distortion. First, Choosing high-precision HALCON calibration board as calibration model board, we conducted a one-time shooting against CCD camera calibration board needed calibration. And then our algorithm used the SIFT algorithm for the effective extraction of coordinate of feature point from calibration board image that can reach the sub-pixel accuracy. At last, all linear calibrations of parameters of the camera are completed step by step which based on Radial-Array-Constraints and first-order radial distortion model, and the complication of nonlinear optimization is avoided. We improves the original algorithm that tz is calibrated independently, and leads to a better results in the convergence of the focal length f. Experiments show that the precision is higher for most of the camera calibration.