1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
2. College of Computer Science, Chongqing University, Chongqing, China
3. Faculty of Engineering, The University of Sydney, Sydney, NSW, Australia
4. School of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China
5. Chongqing Key Laboratory of Image Cognition, Chongqing University of Posts and Telecommunications, Chongqing, China