| Feb.2013 | ?, A, CVWW, Org.com. |
| ? 2013 | Wien, A, GbR, Chair \yearsep |
| Feb.2012 | ?, SLO, CVWW, Prog.com. \yearsep |
| Feb.2011 | Mitterberg, A, CVWW, Prog.com. |
| April 2011 | Nancy, F, DGCI, Prog.com. |
| May 2011 | Münster, D, GbR, Prog.com. |
| May 2011 | Madrid, E, IWCIA, Prog.com. |
| May 2011 | Graz, A, ÖAGM, Prog.com. |
| Aug.2011 | Sevilla, E, CAIP, Co-chair with Pedro Real, Prog.com. |
| Sept.2011 | Ravenna, I, ICIAP, Prog.com. |
| Nov.2011 | Pucon, Chile, CIARP, Prog.com., Tutorial, Keynote \yearsep |
| Feb.2010 | Nove Hrady, CZ, CVWW, Progr.com., session chair. |
| Aug.2010 | Cesme, TR, S+SSPR workshops, Prog.com. . |
| Aug.2010 | Istanbul, TR, ICPR, Prog.com. |
| Nov.2010 | Chipiona, E, CTIC workshop, Prog.com. \yearsep |
| Feb.2009 | Eibiswald, A, CVWW, Co-chair with Adrian Ion. |
| May 2009 | Venice, I, GbR, Prog.com., session chair. |
| Aug.2009 | St.Kathrein/Offenegg, A, 'Computational Topology in Image Context', Co-Chair with Helena Molina Abril, Progr.com., session chair. |
| Sept.2009 | Münster, D, CAIP, Prog.com, session chair. |
| Oct.2009 | Montreal, Can, DGCI, Prog.com. |
| Nov.2009 | Guadalajara, Mexico, CIARP, Progr. Comm., session chair. |
| Nov.2009 | Playa del Carmen, Mexico, IWCIA, Progr. Comm., session chair. \yearsep |
| Feb.2008 | Moravske Toplice, Slo, CVWW 2008, Progr.com., session chair. |
| Feb.2008 | Soboth, A, Workshop on Structural Representations in Videos, chair. |
| April 2008 | Lyon, F, DGCI, Prog.com. |
| May 2008 | Linz, A, ÖAGM 2008, prog.com., session chair. |
| June 2008 | München, D, DAGM, Prog.com. |
| Sept.2008 | Havanna, Cu, CIARP, Co-chair with J. Shulclopper, Prog.com. |
| Dec.2008 | Orlando, USA, S+SSPR, Prog.com. |
| Dec.2008 | Tampa, USA, 19th ICPR, Prog.com. \yearsep |
| Feb.2007 | St.Lambrecht, A, CVWW 2007, Progr.com., session chair. |
| May 2007 | Krumbach, A, ÖAGM 2007, prog.com., session chair. |
| June 2007 | Alicante, E, GbR, Prog.com. |
| Sept.2007 | Wien, A, CAIP, Gen.chair, Co-chair M. Kampel, Prog.com. |
| Nov.2007 | Valparaiso, Chile, CIARP, Prog.com. \yearsep |
| Feb.2006 | Telc, CZ, CVWW 2006, Progr.com., session chair. |
| Mar.2006 | Obergurgl, A, ÖAGM 2006, prog.com., session chair. |
| Aug.2006 | Hong Kong, China, S+SSPR, Prog.com. |
| Aug.2006 | Hong Kong, China, 18th ICPR, Prog.com. |
| Sept.2006 | Berlin, D, DAGM, Prog.com. |
| Oct.2006 | Szeged, H, DGCI, Prog.com. |
| Nov.2006 | Cancun, Mex., CIARP, Prog.com. \yearsep |
| Feb.2005 | Zell an der Pram, A, ACVW 2005, Prog.com. |
| Feb.2005 | Zell an der Pram, A, CVWW 2005, Prog.com. |
| Apr.2005 | Poitiers, F, GbR5 2005, prog.com. |
| Apr.2005 | Poitiers, F, DGCI 2005, prog.com. |
| May 2005 | Veszprem, H, ÖAGM, Prog.com. |
| Aug.2005 | Wien, A, DAGM, Gen.chair, Co-chair R. Sablatnig, Prog.com. |
| Sept.2005 | Paris, F, CAIP, Prog.com. \yearsep |
| Feb.2004 | Piran, Slo, CVWW 2004, Prog.com. |
| May 2004 | Prague, Cz, ECCV, Prog.com. |
| June 2004 | Hagenberg, A, ÖAGM, Prog.com. |
| Aug.2004 | Cambridge, GB, ICPR, Prog.com. |
| Aug.2004 | Tübingen, D, DAGM, Prog.com. |
| Sept.2004 | Wien, A, EUSIPCO, Prog.com. \yearsep |
| Feb.2003 | Valtice, CZ, CVWW 2003, Prog.com. |
| June 2003 | Laxenburg, A, ÖAGM, Prog.com. |
| July 2003 | York, GB, GbR4 2003, prog.com. |
| Aug.2003 | Groningen, NL, CAIP 2003, Prog.com. |
| Sept.2003 | Magdeburg, D, DAGM 2003, Prog.com. |
| Nov.2003 | Naples, I, DGCI 2003, Prog.com. \yearsep |
| Feb.2002 | Bad Aussee, A, CVWW 2002, progr.chair |
| May 2002 | Graz, A, ÖAGM 2002, progr.com. |
| June 2002 | Bordeaux, F, DGCI 2002, prog.com., session chair. |
| Aug. 2002 | Windsor, Can, SPR/SSPR 2002 Workshop, Prog.com. |
| Aug. 2002 | Quebec City, Can, ICPR 2002, Prog.com., IAPR executive com. |
| Sep. 2002 | Zürich, Ch, DAGM 2002 Symposium, Prog.com., session chair. \yearsep |
| Feb.2001 | Bled, Slo, CVWW 2001, progr.com. |
| Mar.2001 | Rio de Janeiro, Brazil, ICAPR 2001, progr.co-chair |
| May 2001 | Ischia, I, Gbr3 2001, progr.co-chair |
| May 2001 | Capri, I, IWVF4 2001, progr.com. |
| June 2001 | Bordeaux, F, Representing Image Topology, gen.org. |
| June 2001 | Berchtesgaden, D, ÖAGM 2001, progr.com. |
| Sept.2001 | Munich, D, DAGM 2001, progr.com. \yearsep |
| Feb.2000 | Perslak, CZ, Czech Pattern Recognition Workshop, program committee. |
| May 2000 | Lyon, F, ERASMUS Intensive Program 2000, Co-Organizer and teacher. |
| May 2000 | Villach, A, 24th ÖAGM meeting, program committee, session chair. |
| Jun.2000 | Lucca, I, MPATHE, program committee, session chair. |
| Aug.2000 | Alicante, E, SPR/SSPR 2000 Workshop, program committee. |
| Sept.2000 | Barcelona, E, ICPR2000, program committee, session chair. |
| Dec.2000 | Uppsala, S, DGCI Workshop, program committee, session chair. \yearsep |
| Feb.1999 | Gh. Gamerith, A, CVWW, program committee, session chair. |
| Mar.1999 | Marne-La-Vallee, F, 9th DGCI, program committee. |
| May 1999 | Haindorf, A, 2nd Workshop of IAPR-TC15 on Graph-Based Representations, co-chair together with J.-M. Jolion. |
| May 1999 | Steyr, A, 23rd ÖAGM meeting, program committee. |
| May 1999 | Graz, A, WIPA meeting, session chair. |
| Sept.1999 | Bonn, G, DAGM99, program committee. |
| Sept.1999 | Venice, I, 10th ICIAP, program committee. |
| Sept.1999 | Budapest, H, FSPIPA, program committee. \yearsep |
| Feb.1998 | Gozd Martuljek, Slo, CVWW, program committee, session chair. |
| May 1998 | Illmitz, A, 22th ÖAGM, program committee, session chair. |
| Aug.1998 | Sydney, Aus, SSPR, program committee, session chair. |
| Sept.1998 | Stuttgart, G, DAGM98, program committee. \yearsep |
| Apr.1997 | Lyon, F, Workshop of IAPR-TC15 on Graph-Based Representations, co-chair together with J.-M. Jolion. |
| May 1997 | Hallstadt, A, 23rd ÖAGM meeting, program committee. |
| May 1997 | Capri, I, IWVF3, program committee, session chair. |
| Sept.1997 | Florence, I, 9th ICIAP, program committee, session chair. |
| Sept.1997 | Braunschweig, G, DAGM97, program committee. |
| Dec.1997 | Montpellier, F, 7th DGCI, program committee, session chair. \yearsep |
| July 1996 | Palermo, I, Workshop: Human and Machine Perception: Information Fusion, program committee, panel chair. |
| Aug.1996 | Wien, A, 13th ICPR, general conference chair, 1000 participants. |
| Sept.1996 | Heidelberg, G, 18th DAGM, program committee. \yearsep |
| Sept.1995 | Prag, CZ, CAIP'95, program committee, session chair, proceedings co-editor. |
| Sept.1995 | Bielefeld, G, 17th DAGM, program committee. |
| Sept.1995 | San Remo, I, ICIAP95, program committee. |
| Sept.1995 | Clermont Ferrand, F, DGCI95, program committee, session chair. \yearsep |
| March 1994 | Dagstuhl, G, Workshop Theobild 94, co-organizer, editor. |
| May 1994 | Capri, I, Intl. Workshop on Visual Form II, program committee, session chair. |
| Sept.1994 | Wien, A, 16th DAGM symposium, general conference chair. |
| Sept.1994 | Grenoble, F, DGCI94, program committee. \yearsep |
| Apr. 1993 | Wien, A, ERASMUS Intensive Program, program chair. |
| June 1993 | New York, USA, CVPR'93, program committee. |
| Sept.1993 | Budapest, H, CAIP'93, program committee, session chair, proceedings' co-editor. |
| Sept.1993 | Lübeck, G, 15th DAGM, program committee, session chair. \yearsep |
| May 1992 | Wien, A, 16th ÖAGM-Meeting, conference chair. |
| Aug. 1992 | The Hague, NL, 11th ICPR, program committees, session chairs. |
| Sept.1992 | Dresden, G, 14th DAGM, program committee, session chair. \yearsep |
| Sept.1991 | Wien, A, Eurographics '91 paper review, session chair. \yearsep |
| June 1990 | College Park, MD, IAPR-TC7 workshop, conference chairman. |
| June 1990 | Atlantic City, NJ, 10th ICPR, paper review. |
| Oct. 1990 | Oberkochen-Aalen, G, 12th DAGM, program committee, session chair. \yearsep |
| June 1989 | Oulu, Finland, 6th SCIA, session chair, panelist. |
| Oct. 1989 | Hamburg, G, 11th DAGM, program committee, session chair. \yearsep |
| Sept.1988 | Edinburgh, U.K., IGARSS'88, session chair. |
| Sept.1988 | Edinburgh, U.K., organizing and directing the IAPR-TC7 workshop on "Multisource Data Sets for Benchmarking Remote Sensing Algorithms". \yearsep |
| July 1986 | Graz, Austria, 10th ÖAGM-Meeting "Bildpyramiden", conference chair, invited speaker: A. Rosenfeld, USA. |
| Oct. 1986 | Paris, France, 8th International Conference for Pattern Recognition (ICPR), paper review and session chair. \yearsep |