SYSTEM FOR DETECTING AN ITEM WITHIN A SPECIFIED ZONE
First Claim
1. A specified zone detection system comprising:
- an image acquisition module situated at a specified zone; and
a presence determination module connected to the image acquisition module; and
wherein;
the image acquisition module provides a current image of the specified zone;
the presence determination module comprises a reference image source;
the reference image source provides a reference image of the specified zone without a person present in the specified zone; and
the presence determination module indicates from a comparison of the current image and the reference image whether there is a person present in the specified zone.
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Accused Products
Abstract
The disclosure reveals a system for detecting one or more persons in a specified zone. A determination is whether there is a person in the zone. A presence determination module may indicate from a current image of the zone compared with a reference image of the zone, whether there is a person in or not in the zone. An illumination controller may assure that the zone is sufficiently illuminated for a current image sufficient for comparison with the reference image to determine a possible presence of a person in the zone. The illumination may be infrared. The system may be used to assure appropriate and adequate face velocity at a fume hood having the presence of a person and having minimal face velocity in the absence of a person at the fume hood.
13 Citations
20 Claims
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1. A specified zone detection system comprising:
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an image acquisition module situated at a specified zone; and a presence determination module connected to the image acquisition module; and wherein; the image acquisition module provides a current image of the specified zone; the presence determination module comprises a reference image source; the reference image source provides a reference image of the specified zone without a person present in the specified zone; and the presence determination module indicates from a comparison of the current image and the reference image whether there is a person present in the specified zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for determining a presence of a person in a zone, comprising:
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capturing a current image of a specified zone; capturing a reference image of the specified zone without any person present in the specified zone; comparing the current image of the specified zone with a reference image of the specified zone; seeking one or more differences between the current image and the reference image; determining whether the one or more of the differences exhibit a person in the specified zone; assuring that the specified zone is environmentally safe if a person is determined to be in the specified zone; providing and adjusting an airflow in the specified zone to assure that the specified zone is environmentally safe; adjusting the airflow in the specified zone if there an absence of a person in the specified zone to a level that is more economical than a level of airflow that assures that the specified zone is environmentally safe; and providing lighting as needed of the specified zone. - View Dependent Claims (14, 15, 16)
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17. A zone presence sensor system comprising:
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an image acquisition module situated in a fume hood operator zone; a microprocessor connected to the image acquisition module; and an illumination module connected to the microprocessor; and wherein; the microprocessor does a comparison of a current image of the operator zone from the image acquisition module with a reference image of the operator zone to determine if there is an item in the current image that is absent in the reference image; the comparison of the current and reference images is made on a pixel by pixel basis; the microprocessor provides an output based on pixel differences between the current and reference images to determine if there is an item in the current image that is absent in the reference image; and the illumination module provides infrared lighting at fume hood operator zone as needed for the microprocessor to do a comparison of a current image of the operator zone from the image acquisition module with a reference image of the operator zone to determine if there is an item in the current image that is absent in the reference image. - View Dependent Claims (18, 19, 20)
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Specification