Camera center estimation
A fast camera calibration technique to estimate the center of perspective projection of an imaging camera has been described. The proposed technique requires a single image of two planar calibration charts arranged in a special manner. The special arrangement of the calibration charts simplifies the projection equations relating the 3-D scene coordinates to the 2-D image coordinates and they can be suitably combined to eliminate the unknown intrinsic parameters other than the desired center. We have analyzed the error in the center estimate due to various alignment errors in the experimental setup, and shown that the scheme is quite robust.