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Space-Time Tree Ensemble for Action Recognition and Localization

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Abstract

Human actions are, inherently, structured patterns of body movements. We explore ensembles of hierarchical spatio-temporal trees, discovered directly from training data, to model these structures for action recognition and spatial localization. Discovery of frequent and discriminative tree structures is challenging due to the exponential search space, particularly if one allows partial matching. We address this by first building a concise action word vocabulary via discriminative clustering of the hierarchical space-time segments, which is a two-level video representation that captures both static and non-static relevant space-time segments of the video. Using this vocabulary we then utilize tree mining with subsequent tree clustering and ranking to select a compact set of discriminative tree patterns. Our experiments show that these tree patterns, alone, or in combination with shorter patterns (action words and pairwise patterns) achieve promising performance on three challenging datasets: UCF Sports, HighFive and Hollywood3D. Moreover, we perform cross-dataset validation, using trees learned on HighFive to recognize the same actions in Hollywood3D, and using trees learned on UCF-Sports to recognize and localize the similar actions in JHMDB. The results demonstrate the potential for cross-dataset generalization of the trees our approach discovers.

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Notes

  1. To avoid notation clutter, we omit the action class label a for \(\mathcal {T}\), \(\mathbf {w}\), \(\Phi \), \(\phi \) and \(\varphi \).

  2. Note that we use notation \(\mathcal {T}\) to denote discovered tree structures of human actions, and notation \(\mathbf {T}\) to denote image segment trees from video frame hierarchical segmentation.

  3. We did not find previous works reporting action classification and localization results for these individual action classes for comparison.

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Acknowledgements

This work was supported in part through a Google Faculty Research Award and by US NSF grants 0855065, 0910908, and 1029430.

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Authors and Affiliations

  1. Computer Science, Boston University, Boston, MA, USA

    Shugao Ma & Stan Sclaroff

  2. Adobe Research, San Jose, CA, USA

    Jianming Zhang

  3. Computer Engineering, Hacettepe University, Ankara, Turkey

    Nazli Ikizler-Cinbis

  4. Disney Research, Pittsburgh, PA, USA

    Leonid Sigal

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  1. Shugao Ma
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  2. Jianming Zhang
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  4. Nazli Ikizler-Cinbis
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Correspondence to Shugao Ma.

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Communicated by Ivan Laptev and Cordelia Schmid.

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Ma, S., Zhang, J., Sclaroff, S. et al. Space-Time Tree Ensemble for Action Recognition and Localization. Int J Comput Vis 126, 314–332 (2018). https://doi.org/10.1007/s11263-016-0980-8

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