A VIEWPOINT PLANNING STRATEGY FOR DETERMINING TRUE ANGLES ON POLYHEDRAL OBJECTS BY CAMERA ALIGNMENT

The paper presents a viewpoint planning strategy which automatically g uides a movable camera from an arbitrary position io a position where the optical axis is perpendicular to a plane spanned by any two inters ecting edges on a polyhedral object, i.e., a junction. In related work it is common to use the changing length of edge segments to control s uch alignment, but we demonstrate the use of the apparent angle betwee n the edge segments oi the junction. By basing the control on the appa rent angle we achieve robustness as well as independence of distance t o the object. and focal length. The strategy is able to determine the true angle of a junction with an accuracy of approximately 1 degrees, and align with an accuracy of approximately 6 degrees.