Calibration issues for projector-based 3D-scanning

In this paper we want to introduce an approach to 3D scanning of dynamic scenes. This implementation enables the user not only to manually move a scan head over the object to scan but also to capture moving objects. Registration from scan to scan is done in real-time. The user interacts with the system and watches the scene assembling. He can immediately respond on shadings that occur due to undercuts in the scene. The chosen structured light scan method uses a primarily unknown speckle image that can be easily etched on a chrome-on-glass slide and projected using a strobe light. In the current large scale implementation we are using a standard video beamer and a standard digital camera. Miniaturization and adaptation for special purposes (i. e. medical applications) are scheduled for next year. Focus in this paper shall be laid on calibration issues regarding camera and projector.