Planar vanishing points based camera calibration

An easy and high accurate camera calibration technique using the planar vanishing points is proposed in the paper. According to the geometrical properties of the vanishing points and the square planar model, two constraints between vanishing points and the focal lengths can be found, from which a closed-form solution to focal lengths can be computed. At last, a nonlinear optimization technique is used to refine the parameters. Both computer simulation and real data are used to test the proposed technique.