He is the author of the following books: Robust Computer Vision―Theory and Applications (Kluwer, April 2003) and Machine Learning in Computer Vision (Springer, May 2005). He was a guest editor of a CVIU special issue on video retrieval and summarization (December 2003) and was the co-chair of ACM Multimedia Information Retrieval Workshops, MIR’03 & MIR'04 (in conjunction with ACM Multimedia conferences). He also was the co-chair of the first Human Computer Interaction Workshop, HCI ’04 (in conjunction with ECCV 2004) and of the IEEE Workshop on Human computer Interaction Workshop (in conjunction with ICCV 2005).