Hiroki Watanabe Hideki Tanahashi Yutaka Satoh Yoshinori Niwa Kazuhiko Yamamoto Event Detection for a Visual Surveillance System Using Stereo Omni-directional System. 890-896 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2774&spage=890 2003 conf/kes/2003-2 KES db/conf/kes/kes2003-2.html#WatanabeTSNY03