Method and system for enhanced portal security through stereoscopy
First Claim
Patent Images
1. A portal security system, comprising:
- a sensor capturing plural 2D images of a field of view about a portal;
a 3D imaging system generating a target volume from the plural 2D images of the field of view about the portal, the portal defining a moving volume through which a person passes from an entrance to an exit; and
a processor dynamically varying a position of the target volume within the field of view as the moving volume moves through the field of view, the processor varying the position to correspond to the moving volume according to a position of the portal, the processor detecting and tracking people candidates moving through the target volume to detect a portal access event.
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Abstract
Enhanced portal security is provided through stereoscopy, including a stereo door sensor for detecting and optionally preventing access violations, such as piggybacking and tailgating. A portal security system can include a 3D imaging system that generates a target volume from plural 2D images of a field of view about a portal; and a processor that detects and tracks people candidates moving through the target volume to detect a portal access event.
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Citations
36 Claims
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1. A portal security system, comprising:
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a sensor capturing plural 2D images of a field of view about a portal; a 3D imaging system generating a target volume from the plural 2D images of the field of view about the portal, the portal defining a moving volume through which a person passes from an entrance to an exit; and a processor dynamically varying a position of the target volume within the field of view as the moving volume moves through the field of view, the processor varying the position to correspond to the moving volume according to a position of the portal, the processor detecting and tracking people candidates moving through the target volume to detect a portal access event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A portal security system, comprising:
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a 3D imaging system generating an entry target volume and an exit target volume, the entry target volume being generated from plural 2D images of a field of view about an entry of a portal, the exit target volume being generated from plural 2D images of a field of view about an exit of the portal, at least a subset of the exit target volume being locally distinct from the entry target volume; and a processor dynamically varying position of the entry target volume and the exit target volume within the respective fields of view to correspond to respective moving volumes defined by the portal, the respective moving volumes moving through the respective fields of view, the processor detecting and tracking people candidates moving through the entry target volume and the exit target volume to detect a portal access event.
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12. A method of providing portal security, comprising:
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capturing plural 2D images of a field of view about a portal; generating a target volume from the plural 2D images of the field of view about the portal, the portal defining a moving volume through which a person passes from an entrance to an exit; dynamically varying a position of a target volume within the field of view as the moving volume moves through the field of view, a processor varying the position to correspond to the moving volume according to a position of the portal, detecting people candidates within the target volume; and tracking the people candidates moving through the target volume to detect a portal access event. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of providing portal security, comprising:
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generating an entry target volume from plural 2D images of a field of view about an entry of a portal; generating an exit target volume from plural 2D images of a field of view about an exit of the portal, at least a subset of the exit target volume being locally distinct from the entry target volume; dynamically varying position of the entry target volume and the exit target volume within the respective fields of view to correspond to respective moving volumes defined by the portal, the respective moving volumes moving through the respective fields of view; detecting people candidates within the entry target volume and the exit target volume; and tracking the people candidates moving through the entry target volume and the exit target volume to detect a portal access event. - View Dependent Claims (33, 34)
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35. A method of providing portal security, comprising:
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generating a target volume from plural 2D images of a field of view about a portal; and detecting people candidates within the target volume; tracking the people candidates moving trough the target volume to detect a portal access event, wherein tracking the people candidates comprises; generating confidence scores corresponding to numbers of people candidates being within the target volume; and detecting the portal access event from a series of the generated confidence scores; and generating confidence scores corresponding to only one person being within the target volume by; generating a target volume in three dimensional space; removing a portion of the target volume that corresponds to one of the people candidates in the target volume; generating individual scores for three dimensional points remaining within the target volume, each of the individual scores corresponding to a height of one of the remaining three dimensional points relative to a height threshold; generating a cumulative score from the individual scores; and computing a confidence score corresponding to only one person being within the target volume based on the cumulative score and a second threshold.
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36. A method of providing portal security, comprising:
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generating a target volume from plural 2D images of a field of view about a portal, the portal defining a moving volume through which a person passes from an entrance to an exit; dynamically varying a position of a target volume to correspond to the moving volume according to a position of the portal; detecting people candidates within the target volume; and tracking the people candidates moving through the target volume to detect a portal access event; wherein tracking the people candidates comprises; generating confidence scores corresponding to numbers of people candidates being within the target volume; detecting the portal access event from a series of the generated confidence scores; generating a set of traces over a sequence of frames, each trace in the set corresponding to a trajectory of a people candidate during the sequence of frames; assigning weights to the sequence of frames, such that the weights are a uniform weight unless the set of traces includes a first trace and a second trace with the second trace being generated over a set of frames that is substantially less than the first trace, the weights assigned to the set of frames that generated the second trace being assigned a weight less than the uniform weight; and applying the assigned weights of the sequence of frames to the confidence scores of corresponding frames.
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Specification