He received the B.E., M.E., and Ph.D degrees in communication engineering from Tohoku University, Japan, in 1998, 2000 and 2003, respectively. His research interests include fundamental techniques including approximate nearest neighbor search through applications including document image retrieval, object recognition, character recognition, face recognition, video retrieval, reading behavior analysis and wearable devices. He has co-authored over 110 peer reviewed publications in peer-reviewed conferences and journals in these areas.