Journal
INTERNATIONAL JOURNAL OF COMPUTER VISION
Volume 103, Issue 1, Pages 60-79Publisher
SPRINGER
DOI: 10.1007/s11263-012-0594-8
Keywords
Action recognition; Dense trajectories; Motion boundary histograms
Categories
Funding
- National Natural Science Foundation of China (NSFC) [60825301]
- National Basic Research Program of China (973 Program) [2012CB316302]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA06030300]
- Microsoft/INRIA
- European integrated project AXES
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This paper introduces a video representation based on dense trajectories and motion boundary descriptors. Trajectories capture the local motion information of the video. A dense representation guarantees a good coverage of foreground motion as well as of the surrounding context. A state-of-the-art optical flow algorithm enables a robust and efficient extraction of dense trajectories. As descriptors we extract features aligned with the trajectories to characterize shape (point coordinates), appearance (histograms of oriented gradients) and motion (histograms of optical flow). Additionally, we introduce a descriptor based on motion boundary histograms (MBH) which rely on differential optical flow. The MBH descriptor shows to consistently outperform other state-of-the-art descriptors, in particular on real-world videos that contain a significant amount of camera motion. We evaluate our video representation in the context of action classification on nine datasets, namely KTH, YouTube, Hollywood2, UCF sports, IXMAS, UIUC, Olympic Sports, UCF50 and HMDB51. On all datasets our approach outperforms current state-of-the-art results.
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