Imaging surveillance system and method for event detection in low illumination
First Claim
Patent Images
1. A surveillance system for detecting an event, comprising:
- a sensor for capturing a current image using a first exposure time to produce sensor values representing said current image and capturing an event image using a second exposure time less than said first exposure time; and
an image processing system for performing a comparison of at least a portion of said sensor values representing said current image and spatially corresponding sensor values of a stored reference image captured using said first exposure time, said image processing system further for detecting said event in said current image based upon said comparison and instructing said sensor to capture said event image.
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Abstract
A surveillance system and method is provided for detecting and event and then capturing an image of the event under low illumination conditions. A camera captures a current image and a prior reference image under low illumination conditions using a long exposure time and compares the current and reference images to determine whether an event has occurred in the current image. An illumination source is activated upon the detection of an event to provide artificial illumination. The illumination allows an additional event image to be captured using a shorter exposure time.
76 Citations
20 Claims
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1. A surveillance system for detecting an event, comprising:
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a sensor for capturing a current image using a first exposure time to produce sensor values representing said current image and capturing an event image using a second exposure time less than said first exposure time; and
an image processing system for performing a comparison of at least a portion of said sensor values representing said current image and spatially corresponding sensor values of a stored reference image captured using said first exposure time, said image processing system further for detecting said event in said current image based upon said comparison and instructing said sensor to capture said event image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for performing event detection within a surveillance system, the method comprising:
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comparing a current image with a reference image, said current image and said reference image being captured using a first exposure time;
detecting an event based upon said comparing; and
capturing an event image using a second exposure time less than said first exposure time. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for capturing an image of an event by a surveillance system, the method comprising:
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comparing a current image with a reference image, said current image and said reference image being captured using a first exposure time;
detecting an event based upon said comparing;
in response to said detecting, providing artificial illumination; and
capturing an event image under the artificial illumination using a second exposure time less than said first exposure time. - View Dependent Claims (18, 19, 20)
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Specification