Fei Wu is a senior member of CCF. He received the B.S. degree from Lanzhou University, China, the M.S. degree from Macao Univer- sity, China, and the Ph.D. degree from Zhejiang University, Hangzhou, China. His research interest includes multimedia retrieval and statistic learning. Ya-Hong Han received the B.S. degree in 2000 from Zhengzhou Uni- versity, China, the M.S. degree in 2003 from Hohai University, Nan- jing, China. He is currently pur- suing the Ph.D. degree at the Col- lege of Computer Science, Zhejiang University. His research interests are machine learning and multimedia retrieval. Yue-Ting Zhuang is a Member of IEEE. He received the B.S., M.S., and Ph.D. degrees from Zhe-jiang University, Hangzhou, China, in 1986, 1989, and 1998, respectively. Currently, he is a professor and Ph.D. supervisor at the College of Computer Science, Zhejiang University. His research interests include multimedia databases, artificial intelligence, and video-based animation.