Searching and hyperlinking using word importance segment boundaries in MediaEval 2013

This paper reports a set of experiments performed in the context of the Searching and Hyperlinking task of the MediaEval Benchmark Initiative 2013. The Searching part challenges to return a ranked list of video segments that are relevant given some textual user query, while for the Hy-perlinking task the aim is to return a ranked list of video segments that are relevant given some video segment. The main focus is on finding a way to compute flexible segment boundaries. This is performed by extending the term frequency part of tf-idf to include the temporal dimension of videos. Although the contribution is theoretically sound its performance is relatively poor, which we attribute to the focus on speech data and the hyperlinking process. We plan to refine our method in the future overcome these limitations.