Guest Editor for the IEEE Transactions on Big Data, Special Issue on Big Media Data: Understanding, Search, and Mining, Summer 2016.
Guest Editor for the Journal on Multimodal User Interfaces, Special Issue on Emotion Recognition in the Wild Fall 2015.
Guest Editor for the Image and Vision Computing Journal, Special Issue on Event-based Media Processing and Analysis , Fall 2015.
Guest Editor for Machine Vision and Applications, Special Issue on Contextual Visual Computing, vol. 25, issue 7, October 2014.
Guest Editor for IEEE MultiMedia, Special Issue on Large Scale Geo-Social Multimedia Computing, vol. 21, issue 3, July-September 2014.
Guest Editor for IEEE Transactions on Multimedia, Special Issue on Socio-Mobile Media Analysis and Retrieval, vol. 16, issue 3, April 2014.
Guest Editor for Computer Vision and Image Understanding, Special Issue on Learning from Multiple Evidences for Large Scale Multimedia Analysis vol. 118, issue 1, January 2014.
Guest Editor for International Journal of Computer Vision, Special Issue on Human-Computer Interaction: Real-Time Vision Aspects of Natural User Interfaces vol. 101, issue 3, February 2013.
Guest Editor for the Journal of Visual Communication and Image Representation, Special Issue on Large-Scale Multimedia Search, vol. 21, issue 8, November 2010.
Guest Editor for the IEEE Transactions on Multimedia, Special issue on Multimodal Affective Interaction vol. 12, issue 6, October 2010.
Guest Editor for the Image and Vision Computing Journal, Special Issue on Face and Gesture Recognition, vol. 28, nr. 5, May 2010.
Guest
Editor for the ACM Transactions on Multimedia Computing Communication and
Applications Special Issue on Multimedia Analysis, Vol 4, No 4, 2008.
Guest
Editor for Computer Vision and Image Understanding, Special Issue on
Similarity Matching, Vol 110, No 3, June 2008.
Guest
Editor for the Image and Vision Computing Journal Special Issue on
Human-computer Interaction, Vol 25, No. 12, December 2007.
Guest
Editor for the IEEE Computer, Special Issue on Human-centered Computing,
Vol 40, No 5, May 2007.
Guest
Editor for the ACM Transactions on Multimedia Computing Communication and
Applications Special Issue on Multimedia Information Retrieval, Vol 2,
No.1 February 2006.
Guest
Editor for the ACM Multimedia Systems Journal Special Issue on Systems and
Architectures of Multimedia Information Retrieval, Vol 10, No. 6, October
2005.
Guest
Editor for Computer Vision and Image Understanding Special Issue on Video
Retrieval and Summarization, Vol. 92, No. 2-3, November/December, 2003
Program Chair, International Conference on Computer Vision (ICCV), Venice, October 2017
General Chair, International Conference on Multimedia Retrieval, Bucharest, June 2017
Program Chair, European Conference on Computer Vision (ECCV), Amsterdam, October 2016
General Chair, International Conference on Multimedia Modelling, Miami, January 2016
Area Chair for International Conference on Computer Vision, Santiago, Chile, December 2015
Area Chair for ACM Multimedia, Brisbane (Australia), October 2015
General Chair, ACM Multimedia, Barcelona, October 2013
General Chair, International Conference on Affective Computing and Intelligent Interaction (ACII), Geneva, September 2013
Program Chair, International Conference on Multimedia Modelling, Huangshan, January 2013
Area Chair for ACM Multimedia, Nara (Japan), October 2012
Program Chair for the International Conference on Multimodal Interfaces (ICMI), Alicante, November 2011
Program Chair, ACM Multimedia, Scottsdale, December 2011
Area Chair for the Asian Conference on Computer Vision (ACCV), Queenstown (NZ), November 2010
Track Chair International Conference on Pattern Recognition (ICPR), Istanbul, August 2010
General Chair of the International Conference on Image and Video Retrieval (CIVR), Beijing, July 2010 (B ranking).
Area Chair European Conference on Computer Vision (ECCV), Heraklion, September 2010 (A ranking).
Area Chair Asian Conference on Computer Vision (ACCV), Xian, September 2009 (B ranking).
Track Chair for the International World Wide Web conference (WWW), Madrid, April 2009 (A* ranking).