1. Engineering Research Center of Learning-Based Intelligent System (Ministry of Education), the Key Laboratory of Computer Vision and Systems (Ministry of Education), and the School of Computer Science and Engineering, Tianjin University of Technology, Tianjin, China
2. Instituto de Biomecánica de Valencia, Universitat Politècnica de València, Valencia, Spain
3. Key Laboratory of Computer Vision and Systems (Ministry of Education), Tianjin University of Technology, Tianjin, China