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- W61129706 abstract "Unsupervised discovery of commonalities in images has recently attracted much interest due to the need to find correspondences in large amounts of visual data. A natural extension, and a relatively unexplored problem, is how to discover common semantic temporal patterns in videos. That is, given two or more videos, find the subsequences that contain similar visual content in an unsupervised manner. We call this problem Temporal Commonality Discovery (TCD). The naive exhaustive search approach to solve the TCD problem has a computational complexity quadratic with the length of each sequence, making it impractical for regular-length sequences. This paper proposes an efficient branch and bound (B&B) algorithm to tackle the TCD problem. We derive tight bounds for classical distances between temporal bag of words of two segments, including ℓ1, intersection and χ 2. Using these bounds the B&B algorithm can efficiently find the global optimal solution. Our algorithm is general, and it can be applied to any feature that has been quantified into histograms. Experiments on finding common facial actions in video and human actions in motion capture data demonstrate the benefits of our approach. To the best of our knowledge, this is the first work that addresses unsupervised discovery of common events in videos." @default.
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- W61129706 date "2012-01-01" @default.
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- W61129706 title "Unsupervised Temporal Commonality Discovery" @default.
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- W61129706 doi "https://doi.org/10.1007/978-3-642-33765-9_27" @default.
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