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Mediaeval benchmark: Social Event Detection using LDA and external resources

This article presents two methods for the automatic detection of social events that were evaluated on the annotated set of pictures as part of the 2011 Mediaeval benchmark [1]. The first method uses a set of web pages and a semantic space obtained by Latent Dirichelet Allocation (LDA, [2, 3]) to classify pictures from Flickr. The second approach uses the query to extract a subset of pictures and classify this subset. Theses approches are compared in the experimental framework of Mediaeval 2011 Social Event Detection task .