Affiliation: | 1. Institute for Analysis and Algebra, TU Braunschweig, 38092?, Braunschweig, Germany 2. Institute for Computer Graphics and Vision, Graz University of Technology, Inffeldgasse 16, 8010?, Graz, Austria 3. The Safety & Security Department, AIT Austrian Institute of Technology GmbH, Donau-City-Stra?e 1, 1220?, Vienna, Austria
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