TUW @ MediaEval 2015 Retrieving Diverse Social Images Task

This paper describes the contributions of Vienna University of Technology (TUW) to the MediaEval 2015 Retrieving Diverse Social Images challenge. Our approach consists of 3 phases: (1) Precision-oriented-phase: in which we focus only on the relevance of the documents; (2) Recall-orientedphase: in which we focus only on the diversity aspect; (3) Merging phase: in which we explore ways to nd a balance between the relevance and diversity factors. We use two fusion methods for this last part. Our best run reached a F1@20 of 0.582.