Yi Zhuang is a Ph.D. candidate in College of Computer Science, Zhejiang University. He received his M.S. degree in computer science from Hangzhou Dianzi University. His main research interests are metricbased high-dimensional indexing, retrieval and indexing of large crossmedia databases, grid computing, etc.E-mail:zhuangyi@cs.zju.edu.cn Yue-Ting Zhuang is a professor in College of Computer Science, Zhejiang University. He received his Ph.D. degree from Zhejiang University. His main research interests focus on multimedia retrieval, computer animation, digital library, etc. Prof. Zhuang serves as a PC member of many conferences. He is also the cochair of PCM'06 and serves on the editorial board of Science in China (Series F).E-mail: yzhuang@cs.zju.edu.cn Fei Wu is an associate professor in College of Computer Science, Zhejiang University. He obtained the Ph.D. degree from Zhejiang University, M.S. degree from Macao University and B.S. degree from Lanzhou University all in computer science. His main research interests include machine learning, multimedia retrieval, digital library, etc.E-mail:wufei@cs.zju.edu.cn