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Elevator passenger detector and door control system which masks portions of a hall image to determine motion and court passengers

  • US 5,387,768 A
  • Filed: 09/27/1993
  • Issued: 02/07/1995
  • Est. Priority Date: 09/27/1993
  • Status: Expired due to Fees
First Claim
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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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