Calibration of stereo 3D scanners with minimal number of views using plane targets and vanishing points

A new calibration methodology of photogrammetric stereo scanners using minimal number of views of plane targets is introduced which can be applied with small effort in equipment and time. It is especially interesting for the fast re-calibration of measurement systems which should be frequently adjusted (changing focus distances, variable focal lengths) or can be easily disturbed. A novel technique is introduced for the determination of the intrinsic camera parameters using only two images of a plane pattern or one image showing two planes. The determination of the extrinsic parameters is obtained using a two-step algorithm. Results of the accuracy of the calibration parameter determination are given as well as examples of 3D reconstruction errors.