Real-time crowd density estimation from video
First Claim
1. A method of video analysis comprising the steps of:
- estimating a background reference frame for representing a background;
estimating geometric parameters for representing a scale variation of objects in a given frame;
obtaining a change detection map for distinguishing the background from the objects in the given frame; and
combining the change detection map with the geometric parameters to determine a measure of congestion of the given frame.
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Accused Products
Abstract
A system and method for automated and/or semi-automated analysis of video for discerning patterns of interest in video streams. In a preferred embodiment, the present invention is directed to identifying patterns of interest in indoor settings. In one aspect, the present invention deals with the change detection problem using a Markov Random Field approach where information from different sources are naturally combined with additional constraints to provide the final detection map. A slight modification is made of the regularity term within the MRF model that accounts for real-discontinuities in the observed data. The defined objective function is implemented in a multi-scale framework that decreases the computational cost and the risk of convergence to local minima. To achieve real-time performance, fast deterministic relaxation algorithms are used to perform the minimization. The crowdedness measure used is a geometric measure of occupancy that is quasi-invariant to objects translating on the platform.
21 Citations
14 Claims
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1. A method of video analysis comprising the steps of:
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estimating a background reference frame for representing a background;
estimating geometric parameters for representing a scale variation of objects in a given frame;
obtaining a change detection map for distinguishing the background from the objects in the given frame; and
combining the change detection map with the geometric parameters to determine a measure of congestion of the given frame. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for video analysis comprising the steps of:
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estimating a background reference frame for representing a background;
estimating geometric parameters for representing a scale variation of objects in a given frame;
obtaining a change detection map for distinguishing the background from the objects in the given frame; and
combining the change detection map with the geometric parameters to determine a measure of congestion of the given frame. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification