1. Bonn-Rhein-Sieg University of Applied Sciences, Institute of Visual Computing, Germany
2. Cybernetics and Reality Engineering Laboratory, Nara Institute of Science and Technology, Japan
3. Cybernetics & Reality Engineering, Nara Institute of Science and Technology, Japan
4. Bonn-Rhein-Sieg University of Applied Sciences, Institute of Visual Computing, Germany and School of Interactive Arts and Technology, Simon Fraser University, Canada