K-Space at TRECVid 2007
Wilkins, Peter and Adamek, Tomasz and Byrne, Daragh and Jones, Gareth J.F. and Lee, Hyowon and Keenan, Gordon and McGuinness, Kevin and O'Connor, Noel E. and Smeaton, Alan F. (2007) K-Space at TRECVid 2007. In: TRECVid 2007 - Text REtrieval Conference TRECVid Workshop, 5-6 November 2007, Gaithersburg, Maryland.
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In this paper we describe K-Space participation in
TRECVid 2007. K-Space participated in two tasks, high-level feature extraction and interactive search. We present our approaches for each of these activities and provide a brief analysis of our results. Our high-level feature submission utilized multi-modal low-level features which included visual, audio and temporal elements. Specific concept detectors (such as Face detectors) developed by K-Space partners were also used. We experimented with different machine learning approaches including logistic regression and support vector machines (SVM). Finally we also experimented with both early and late fusion for feature combination. This year we also participated in interactive search, submitting 6 runs. We developed two interfaces which both utilized the same retrieval functionality. Our objective was to measure the effect of context, which was supported to different degrees in each interface, on user performance.
The first of the two systems was a ‘shot’ based interface,
where the results from a query were presented as a ranked
list of shots. The second interface was ‘broadcast’ based,
where results were presented as a ranked list of broadcasts.
Both systems made use of the outputs of our high-level feature submission as well as low-level visual features.
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