A flexible stereo calibration for a structured-light profilometer

The paper proposes a novel method for the calibration of a 3-D scanner composed of a camera and a projector. The proposed method models the projector as a second camera, and then reduces the calibration of a camera - projector pair into the calibration of a stereo pair of cameras, with advantages in terms of simplicity, flexibility, accuracy and availability of known solutions. This approach is very advantageous overall for those scanners whose camera and projector can be moved by the operators in order to achieve the most suitable configuration for the specific object under measurement. Results are shown for different organizations of the procedure and for different geometrical configurations. The uncertainty of calibrated parameters is also discussed.