1. School of Automation, Chengdu University of Information Technology, Chengdu, China
2. Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China
3. Department of Information and Electronic Engineering, Muroran Institute of Technology, Muroran, Japan
4. Department of Mathematics, Harbin Institute of Technology, Weihai, China
5. College of Information Science and Engineering, Northeastern University, Shenyang, China