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              <p>A semantic indexing system capable of detecting both spatial appearance and motion-related semantic concepts requires the use of both spatial and motion descriptors. However, extracting motion descriptors on very large video collections requires great computational resources, which has caused most approaches to limit themselves to a spatial description. This paper explores the use of motion descriptors to complement such spatial descriptions and improve the overall performance of a generic semantic indexing system. We propose a framework for extracting and describing trajectories of tracked points that keeps computational cost manageable, then we construct Bag of Words representations with these trajectories. After supervised classification, a late fusion step combines information from spatial descriptors with that from our proposed Bag of Trajectory Words descriptors to improve overall results. We evaluate our approach in the very difficult context of the TRECVid Semantic Indexing (SIN) dataset.</p>
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