Quanfu Fan Kobus Barnard Arnon Amir Alon Efrat Ming Lin Matching slides to presentation videos using SIFT and scene background matching. 239-248 2006 conf/mir/2006 Multimedia Information Retrieval http://doi.acm.org/10.1145/1178677.1178710 db/conf/mir/mir2006.html#FanBAEL06