He received the Ph.D. degree in electrical engineering from Beijing Jiaotong University, Beijing, China, in 1995. He was a Post-Doctoral Research Fellow with the National Laboratory on Machine Perception, Peking University, Beijing, from 1995 to 1997. He has been an associate professor with the Key Laboratory of Machine Perception(MOE), School of Electronics Engineering and Computer Science, Peking University since 1997. His current research interests include image processing, statistical pattern recognition, and visual recognition. He has published more than 60 papers in refereed journals and conferences in these areas, and received 6 national invention patents.