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A Bayesian Nonparametric Approach to Modeling Motion Patterns

Author(s)
Joseph, Joshua Mason; Doshi-Velez, Finale P.; Huang, Albert S.; Roy, Nicholas
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Abstract
The most difficult—and often most essential— aspect of many interception and tracking tasks is constructing motion models of the targets to be found. Experts can often provide only partial information, and fitting parameters for complex motion patterns can require large amounts of training data. Specifying how to parameterize complex motion patterns is in itself a difficult task. In contrast, nonparametric models are very flexible and generalize well with relatively little training data. We propose modeling target motion patterns as a mixture of Gaussian processes (GP) with a Dirichlet process (DP) prior over mixture weights. The GP provides a flexible representation for each individual motion pattern, while the DP assigns observed trajectories to particular motion patterns. Both automatically adjust the complexity of the motion model based on the available data. Our approach outperforms several parametric models on a helicopter-based car-tracking task on data collected from the greater Boston area.
Date issued
2011-08
URI
http://hdl.handle.net/1721.1/61734
Department
Massachusetts Institute of Technology. Computer Science and Artificial Intelligence Laboratory; Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
Journal
Autonomous Robots
Publisher
Kluwer Academic Publishers
Citation
Joseph, Joshua, et al. "A Bayesian Nonparametric Approach to Modeling Motion Patterns" Autonomous Robots, 2011, 31.4 p.383–400. (From the issue entitled "Special Issue: Search and Pursuit-evasion with Mobile Robots")
Version: Original manuscript
ISSN
0929-5593
1573-7527

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