1. Department of Electrical Engineering and Electronics, Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, China
2. School of Computer Science, The University of Manchester, Manchester, U.K.
3. Science and Technologies Facilities Council, Rutherford Appleton Laboratory, Oxon, U.K.
4. HuBei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, China
5. School of Information Science and Technology, University of Science and Technology of China, Hefei, China
6. Huazhong University Science and Technology, Wuhan, China
7. Department of Computer Science, The University of Liverpool, Liverpool, U.K.