Welcome to the proceedings of the 7th Paci?c-Rim Conference on Multimedia (PCM2006)heldatZhejiang University,Hangzhou,China,November2-4,2006. Following the success of the previous conferences, PCM 2000 in Sydney, PCM 2001 in Beijing, PCM 2002 in Hsinchu, PCM 2003 in Singapore, PCM 2004 in Tokyo, and PCM 2005 in Jeju, PCM 2006 again brought together researchers, developers, practitioners, and educators in the ?eld of multimedia from around the world. Both theoretical breakthroughs and practical systems were presented at the conference. There were sessions from multimedia retrieval to multimedia coding to multimedia security,coveringa wide spectrum of multimedia research. PCM2006featuredacomprehensiveprogramincludingkeynotetalks,regular paper presentations, and special sessions. We received 755 submissions and the number was the largest among all the PCMs. From such a large number of submissions,weacceptedonly116oralpresentations.Wekindlyacknowledgethe great support provided by the Program Committee members in the reviewing of submissions, as well as the additional reviewers who generously spent many hours. The many useful comments provided by the reviewing process are very useful to authors’ current and future research.