1. Department of Manufacturing and Civil Engineering, Norwegian University of Science and Technology, Gjøvik, Norway
2. Key Laboratory of Computer Vision and System of Ministry of Education, School of Computer Science and Technology, Tianjin University of Technology, Tianjin, China
3. Network Information Systems, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
4. Department of Technology, Management, and Economics, Technical University of Denmark, Lyngby, Denmark