Elevator passenger detector and door control system which masks portions of a hall image to determine motion and court passengers
First Claim
Patent Images
1. A method for detecting motion in the vicinity of an open elevator hall door, comprising:
- a. providing an image of an elevator door sill and a hall in front of an elevator includingproviding an old image of the elevator door sill and hallproviding a new image of the elevator door sill and hallsubtracting the old image from the new image forproviding a difference image;
b. providing a motion detected signal in response to said difference image;
c. over a time period masking out a portion of said difference image, so long as no motion detected signal is provided, thereby providing a masked difference image; and
thend. providing a motion detected signal in response to said masked difference image if a number of pixels in the masked difference image exceeds a selectable thresholde. commanding the elevator door to close when said motion detected signal is no longer provided.
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Abstract
Passengers approaching an elevator are distinguished from other people standing in front of an elevator door by obtaining an image signal of an area in front of the elevator door and masking out of the image signal increasing with time greater portions thereof when no motion is indicated by the image signal for controlling door movement when motion is detected in an unmasked portion of the image.
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Citations
13 Claims
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1. A method for detecting motion in the vicinity of an open elevator hall door, comprising:
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a. providing an image of an elevator door sill and a hall in front of an elevator including providing an old image of the elevator door sill and hall providing a new image of the elevator door sill and hall subtracting the old image from the new image for providing a difference image; b. providing a motion detected signal in response to said difference image; c. over a time period masking out a portion of said difference image, so long as no motion detected signal is provided, thereby providing a masked difference image; and
thend. providing a motion detected signal in response to said masked difference image if a number of pixels in the masked difference image exceeds a selectable threshold e. commanding the elevator door to close when said motion detected signal is no longer provided. - View Dependent Claims (2)
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3. A method for controlling an elevator door, comprising:
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a. providing an image of an elevator door sill and a hall in front of an elevator; b. providing a motion detected signal in response to said image; c. over a time period masking out increasingly greater portions of said image so long as said motion detected signal is provided; d. commanding the elevator door to close when said motion detected signal is no longer provided. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. An apparatus for elevator door control, comprising:
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a camera for providing an image of an elevator door sill and a hall in front of an elevator; an image buffer for storing an old image; a summer for adding said old image and a new image and providing a difference image including a plurality of pixels of variable brightness and providing said motion detected signal in response to said difference image; a mask generator for masking out, increasingly with time, measured from the most recent of motion being detected or the door opening, greater portions of said difference image so long as said motion detected signal is provided; means for commanding said door to close when said motion detected signal is no longer provided. - View Dependent Claims (11, 12, 13)
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Specification