1. College of Electrical and Information Engineering Hunan University Changsha China
2. National Engineering Laboratory for Robot Visual Perception and Control Technology Hunan University Changsha China
3. School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing China
4. Department of Advanced Design and Systems Engineering City University of Hong Kong Kowloon Hong Kong
5. Institute for Automatic Control and Complex Systems (AKS) University of Duisburg‐Essen Duisburg Germany