A camera calibration method based on non-metric distortion correction is proposed. In this method, single
parameter division model is used to correct lens distortion, and based on the same geometric type between straight line and
its projection image, the LM(Levenberg Marquardt) scheme is applied to obtain the distortion parameter and the principal
point by optimization. Then, the actual image point is corrected in order to satisfy the pinhole camera model. Based on the
two basic constraint equations about camera intrinsic parameters, the remaining camera parameters can be solved linearly.
Experimental results show that this method has better robustness in the non-metric distortion correction process. And by the
comparison with Zhang’s method, camera can be calibrated by using only single image, which avoids the coupling between
intrinsic and extrinsic camera parameters, and the efficency of calibration is improved.