School of Information Science and Engineering, Central South University, ChangSha 410083, China.|School of Information Science and Engineering, Central South University, ChangSha 410083, China.|School of Information Science and Engineering, Central South University, ChangSha 410083, China.|School of Information Science and Engineering, Central South University, ChangSha 410083, China.|Division of Biomedical Engineering, University of Saskatchewan, Saskatchewan S7N 5A9, Canada.