Video surveillance system in which trajectory hypothesis spawning allows for trajectory splitting and/or merging
First Claim
1. A method for use in a video surveillance system, the method comprising generating a first plurality of hypotheses, each said hypothesis comprising a respective set of hypothesized trajectories of objects hypothesized to have been moving through an area under surveillance at a previous time, hypothesizing the presence of particular objects in the surveillance space at a present time, and generating a second plurality of extended hypotheses each associated with a respective one of said first plurality of hypotheses, at least one of the extended hypotheses including at least one of a) at least two of the trajectories of the associated first hypothesis extended to the same one of said particular objects or b) at least one of said trajectories of the associated first hypothesis extended to at least two of said particular objects.
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Abstract
A video surveillance system uses rule-based reasoning and multiple-hypothesis scoring to detect predefined behaviors based on movement through zone patterns. Trajectory hypothesis spawning allows for trajectory splitting and/or merging and includes local pruning to managed hypothesis growth. Hypotheses are scored based on a number of criteria, illustratively including at least one non-spatial parameter. Connection probabilities computed during the hypothesis spawning process are based on a number of criteria, illustratively including object size. Object detection and probability scoring is illustratively based on object class.
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Citations
4 Claims
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1. A method for use in a video surveillance system, the method comprising
generating a first plurality of hypotheses, each said hypothesis comprising a respective set of hypothesized trajectories of objects hypothesized to have been moving through an area under surveillance at a previous time, hypothesizing the presence of particular objects in the surveillance space at a present time, and generating a second plurality of extended hypotheses each associated with a respective one of said first plurality of hypotheses, at least one of the extended hypotheses including at least one of a) at least two of the trajectories of the associated first hypothesis extended to the same one of said particular objects or b) at least one of said trajectories of the associated first hypothesis extended to at least two of said particular objects.
Specification