Semantic Multimedia 4th International Conference on Semantic and Digital Media Technologies, SAMT 2009 Graz, Austria, December 2-4, 2009 Proceedings - Chua, Tat-Seng; Kompatsiaris, Yiannis; Mérialdo, Bernard; Haas, Werner; Thallinger, Georg; Bailer, Werner (Springer Berlin Heidelberg, 2009)