1. School of Computer Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, China
2. Intelligent Media Processing Group, College of Information Engineering, Northwest A&F University, Yangling, Shaanxi, China
3. College of Computer Science and Engineering, Tianjin University of Technology, Tianjin, China
4. School of Computer Science, The University of Adelaide, Adelaide, SA, Australia