CERTH @ MediaEval 2011 Social Event Detection Task

This paper describes the participation of CERTH in the“Social Event Detection Task @ MediaEval 2011”, which aims at discovering social events in a large photo collection. The task comprises two challenges: (i) identification of soccer events in the cities of Barcelona and Rome, and (ii) identification of events taking place in two specific venues. We adopt an approach that combines spatial and temporal filters with tag-based location classification models and an efficient photo clustering method. In our best runs, we achieve F-measure and NMI scores of 77.4% and 0.63 respectively for Challenge 1, and 64% and 0.38 for Challenge 2.