There has been recent interest in using video cameras along with computer vision and photogrammetric techniques to aid in the daily positioning of patients for radiation therapy. We describe here a method to calibrate video cameras to the beam coordinate system of a radiation therapy treatment machine. Standard camera calibration relates the threedimensional coordinate system of a calibration p...

A set S of vertices of a connected graph G is convex, if for any pair of vertices u, v ∈ S , every shortest path joining u and v is contained in S . The convex hull CH(S ) of a set of vertices S is defined as the smallest convex set in G containing S . The set S is geodetic, if every vertex of G lies on some shortest path joining two vertices in S, and it is said to be a hull set if its convex ...

During the 88th and 96th Conferences of the Working Committee of the Surveying Authorities of the States of the Federal Republic of Germany (AdV) in 1991 and 1995 the resolution was passed to introduce the European Terrestrial Reference System 1989 (ETRS89) with the universal transversals Mercator projection (UTM) as map projection of GRS80 Ellipsoid in Germany and Europe uniformly. The task of...