1. School of Automation, Xi’an University of Posts and Telecommunications, Xi’an, Shaanxi, China
2. Xi’an Key Laboratory of Advanced Control and Intelligent Process, Xi’an, Shaanxi, China
3. Automatic Sorting Technology Research Center, Xi’an University of Posts and Telecommunications, State Post Bureau of the People’s Republic of China, Xi’an, Shaanxi, China
4. Beijing Hangxing Machinery Manufacturing Co., Ltd, Dongcheng, Beijing, China
5. School of Communications and Information Engineering, Xi’an University of Posts and Telecommunications, Xi’an, Shaanxi, China