1. State Key Laboratory
of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing 100048, China
4. Department of Advanced Robotics, Chiba Institute of Technology, Chiba 275-0016, Japan
5. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong