Following the eleven successful previous events of CBMI (Toulouse 1999, Brescia 2001, Rennes 2003, Riga 2005, Bordeaux 2007, London 2008, Chania 2009, Grenoble 2010, Madrid 2011, Annecy 2012, and Veszprem 2013), It is our pleasure to welcome you to CBMI 2014, the 12th International Content Based Multimedia Indexing Workshop , in Klagenfurt, Austria on June 18-20 2014. CBMI 2014 is organized in cooperation with IEEE Circuits and Systems Society and ACM SIG Multimedia. The 12th International CBMI Workshop aims at bringing together the various communities involved in all aspects of content-based multimedia indexing, retrieval, browsing and presentation. The scientific program of CBMI 2014 will include invited keynote talks and regular, special and demo sessions with contributed research papers.