1. Department of Electronic and Information Engineering, The Hongkong Polytechnic University, and also with College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, China
2. Department of Electronic and Information Engineering, The Hongkong Polytechnic University, Hong Kong
3. College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, China
4. College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China