1Key Laboratory of Pattern Recognition and Intelligent Image Processing, College of Information Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 0 14010, China
2Institute of Information Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 0 10051, China
3College of Computer Engineering and Science, Shanghai University, Shanghai 200444, China
4College of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning 116026, China