“…Although there are a significant number of approaches to dynamic scene segmentation (Collins et al, 2000;Kim et al, 2005;Gutchess et al, 2001;Li et al, 2003;Paschos and Valavanis, 1999;Haritao˘glu et al, 2000;Bobick and Davis, 2001;Thirde et al, 2006) and abnormal action detection (Duque et al, 2006;Gong, 2006, 2008;Zhong et al, 2004;Hamid et al, 2005;Duong et al, 2005), the offline query-processing capabilities are rather limited in most of the existing video-surveillance systems. Retrieving video sequences related to a previously generated alarm is the basic way of querying the semantic content of surveillance videos (e.g., Lyons et al, 2000;Shet et al, 2005).…”