VIDEO SURVEILLANCE SYSTEM EMPLOYING VIDEO PRIMITIVES
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Accused Products
Abstract
A video surveillance system is set up, calibrated, tasked, and operated. The system extracts video primitives and extracts event occurrences from the video primitives using event discriminators. The system can undertake a response, such as an alarm, based on extracted event occurrences.
64 Citations
40 Claims
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1-20. -20. (canceled)
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21. A method of video surveillance, comprising:
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receiving, by a computer system, video images from a video sensor the computer system performing the steps of; analyzing the video to detect stationary objects in the video using background subtraction of a background model; analyzing the video to detect people in the video by using frame differencing to detect foreground objects; upon detecting a first stationary object in the video, defining a zone as a portion of the video around the first stationary object, defining the zone being responsive to a location of the first stationary object, the zone being defined to be larger than an outer boundary of the first stationary object and smaller than a field of view of the video, a size of the zone allowing detection of multiple non-overlapping objects; tracking a duration that the first stationary object remains stationary; issuing an alert in response to determining that the duration of time the first stationary object has remained stationary exceeds a threshold while no person of interest detected in the video has been inside the zone; and permitting a user to set, via a user interface, at least one parameter selected from the group consisting of;
a size of the zone, a shape of the zone, and the duration of time. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification