1. Department of Computer System and Information Technology, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Mathematical Sciences, University of Malaya, Kuala Lumpur, Malaysia
3. Faculty of Information Technology and Electrical Engineering, IIK, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
4. Computer Vision and Pattern Recognition Unit, Indian Statistical Institute, Kolkata, India
5. National Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, China
6. School of Computer Science, University of Technology Sydney, Ultimo, NSW, Australia