1. Department of Electronic and Information Engineering, College of Engineering, the Guangdong Provincial Key Laboratory of Digital Signal and Image Processing, and the Key Laboratory of Intelligent Manufacturing Technology, Ministry of Education, Shantou University, Shantou, China
2. College of Automation Science and Engineering, South China University of Technology, Guangzhou, China
3. School of Electrical Engineering, Guangxi University, Nanning, China
4. Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing, China