1. School of Artificial Intelligence and Automation, the Engineering Research Center of Autonomous Intelligent Unmanned Systems, the Key Laboratory of Image Processing and Intelligent Control, and the State Key Lab of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, China
2. School of Robotics, Hunan University, Hunan, China
3. Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
4. Institute of Engineering and Technology, University of Groningen, Groningen, Netherlands