1. Institute for Communication Systems, University of Surrey, Guildford, U.K.
2. Centre for Vision, Speech, and Signal Processing, University of Surrey, Guildford, U.K.
3. School of Computer Science and Electronic Engineering, University of Essex, Colchester, U.K.
4. Department of Computer Science, Durham University, Durham, U.K.
5. Universiti Teknologi Malaysia, Skudai, Malaysia