1. National Engineering Research Center for Multimedia Software, School of Computer Science, Institute of Artificial Intelligence, Wuhan University, Wuhan, China
2. Hubei Key Laboratory of Transportation Internet of Things, School of Computer Science and Artificial Intelligence, Wuhan University of Technology, Wuhan, China
3. Department of Information Engineering and Computer Science, University of Trento, Trento, Italy
4. Digital Content and Media Sciences Research Division, National Institute of Informatics, Tokyo, Japan