1. Department of Computer Science, City University of Hong Kong, China and David R. Cheriton School of Computer Science, University of Waterloo, Canada
2. Department of Computer Science, City University of Hong Kong, China and Computational Media and Arts Thrust, The Hong Kong University of Science and Technology (Guangzhou), China
3. School of Creative Media, City University of Hong Kong, China and School of Information, University of Michigan Ann Arbor, USA
4. Department of Computer Science, City University of Hong Kong, China