PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Probabilistic Latent Sequential Motifs: Discovering temporal activity patterns in video scenes
Jagan Varadarajan, Rémi Emonet and Jean-Marc Odobez
In: British Machine and Vision Conference (BMVC), Sept 2010, Aberystwyth, UK.


This paper introduces a novel probabilistic activity modeling approach that mines recurrent sequential patterns from documents given as word-time occurrences. In this model, documents are represented as a mixture of sequential activity motifs (or topics) and their starting occurrences. The novelties are threefold. First, unlike previous ap- proaches where topics only modeled the co-occurrence of words at a given time instant, our topics model the co-occurrence and temporal order in which the words occur within a temporal window. Second, our model accounts for the important case where activities occur concurrently in the document. And third, our method explicitly models with latent variables the starting time of the activities within the documents, enabling to implicitly align the occurrences of the same pattern during the joint inference of the temporal topics and their starting times. The model and its robustness to the presence of noise have been validated on synthetic data. Its effectiveness is also illustrated in video activity analysis from low-level motion features, where the discovered topics capture frequent patterns that implicitly represent typical trajectories of scene objects.

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EPrint Type:Conference or Workshop Item (Oral)
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Machine Vision
ID Code:7133
Deposited By:Jean-Marc Odobez
Deposited On:05 March 2011