1. Department of Computer Science and Engineering, Jaypee Institute of Information Technology, Noida, India
2. Laboratoire Informatique, Image et Interaction (L3i), University of La Rochelle, La Rochelle, France
3. Department of Computer Science, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
4. School of Computer Science and Electronic Engineering, University of Essex, Colchester, U.K.