1. School of Information and Communication Engineering, Hainan University, Haikou, China
2. School of Electrical and Mechanical Engineering, Weifang Vocational College, Weifang, China
3. Multimedia Video Product Department, Corporation of Zhongxing Telecommunication Equipment, Nanjing, China
4. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China
5. School of Engineering, University of Kent, Canterbury, U.K.