1. School of Electronic Engineering, Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education, Xidian University, Xi’an, Shaanxi, China
2. Key Laboratory of Computational Intelligence and Chinese Information Processing, Ministry of Education, Shanxi University, Taiyuan, China
3. Department of Computing Technologies, Swinburne University of Technology, Hawthorn, VIC, Australia
4. Agency for Science, Technology and Research, and the School of Computer Science and Engineering, Nanyang Technological University, Singapore