Image registration by means of 3D octree correlation. - Christian Ruwwe; Bjoern Keck; Oliver Rusch; Udo Zölzer; Xavier Loison (MMSP, 2008)

Computing camera orientation relative to a world coordinate frame by detecting its projected axes. - Matthias Lieberei; Christian Ruwwe; Bjoern Keck; Oliver Rusch; Udo Zölzer (SIGGRAPH Posters, 2008)