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    Large-scale statistical modeling of motion patterns: A Bayesian nonparametric approach

    Access Status
    Fulltext not available
    Authors
    Rana, S.
    Phung, D.
    Pham, DucSon
    Venkatesh, S.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
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    Citation
    Rana, S. and Phung, D. and Pham, D. and Venkatesh, S. 2012. Large-scale statistical modeling of motion patterns: A Bayesian nonparametric approach, in Proceedings of the Eighth Indian Conference on Computer Vision, Graphics and Image Processing, Mumbai, India, Dec 16-19, 2012. ACM.
    Source Title
    Indian Conference on Computer Vision, Graphics and Image Processing
    DOI
    10.1145/2425333.2425340
    ISBN
    9781450316606
    School
    Multi-Sensor Proc & Content Analysis Institute
    URI
    http://hdl.handle.net/20.500.11937/55762
    Collection
    • Curtin Research Publications
    Abstract

    We propose a novel framework for large-scale scene understanding in static camera surveillance. Our techniques combine fast rank-1 constrained robust PCA to compute the foreground, with non-parametric Bayesian models for inference. Clusters are extracted in foreground patterns using a joint multinomial+Gaussian Dirichlet process model (DPM). Since the multinomial distribution is normalized, the Gaussian mixture distinguishes between similar spatial patterns but different activity levels (eg. car vs bike). We propose a modification of the decayed MCMC technique for incremental inference, providing the ability to discover theoretically unlimited patterns in unbounded video streams. A promising by-product of our framework is online, abnormal activity detection. A benchmark video and two surveillance videos, with the longest being 140 hours long are used in our experiments. The patterns discovered are as informative as existing scene understanding algorithms. However, unlike existing work, we achieve near real-time execution and encouraging performance in abnormal activity detection. © 2012 ACM.

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