1. School of Electronic, Electrical Engineering and Physics, Fujian University of Technology, Fuzhou, China
2. School of Computer Science and Mathematics, Fujian University of Technology, Fuzhou, China
3. Department of Information Engineering, Beijing Institute of Graphic Communication, Beijing, China
4. School of Computer Science and Technology, Hangzhou Dianzi University, Hangzhou, China
5. School of Computer and Cyber Sciences, Communication University of China, Beijing, China