1. Bielefeld University, Bielefeld, Germany
2. Electronic Imaging Department, Fraunhofer IIS, Erlangen, Germany
3. Department of Computer Science, University of Augsburg, Augsburg, Germany
4. Faculty of Medical Sciences, University of Augsburg, Augsburg, Germany
5. Faculty of Human Sciences and Education, University of Bamberg, Bamberg, Germany
6. Faculty of Information Systems and Applied Computer Science, University of Bamberg, Bamberg, Germany