1. Institute of Computer Graphics and Algorithms; Vienna University of Technology; Vienna Austria
2. Department of Computer Science; Arizona State University; Tempe AZ USA
3. Geometric Modeling and Scientific Visualization Center; King Abdullah University of Science and Technology; Thuwal Saudi Arabia
4. Department of Computer Science; Purdue University; West Lafayette IN USA
5. Computer Vision Laboratory; Swiss Federal Institute of Technology (ETH Zürich); Zürich Switzerland
6. Centre for the Processing of Speech & Images; Katholieke Universiteit Leuven; Heverlee Belgium