Calibration of Catadioptric Sensors by Polarization Imaging

A new efficient method of calibration for catadioptric sensors is presented in this paper. It is based on an accurate reconstruction of the mirror by means of polarization imaging and it permits to relax most of the constraints related to the calibration of the catadioptric systems. No image processing and no calibration pattern are required so that the calibration can be performed in "one click". As a result, the coordinates of the projection rays and a mapping between projection rays and image pixels is obtained. Besides, two methods of triangulation have been adapted to catadioptric sensors and tested. Experiments prove the validity of the method with some preliminary results on 3D reconstruction.