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Method of updating reference background image, method of detecting entering objects and system for detecting entering objects using the methods

  • US 6,546,115 B1
  • Filed: 09/09/1999
  • Issued: 04/08/2003
  • Est. Priority Date: 09/10/1998
  • Status: Expired due to Term
First Claim
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1. A method of updating a reference background image for use in detecting an object entering an image pickup view field of an image pickup device based on a difference between an input image from said image pickup device and a reference background image of said input image, comprising the steps of:

  • displaying said image pickup view field on a display;

    dividing said image pickup view field into a plurality of view field areas based on at least one of predetermined position information and time information of said image pickup view field displayed on said display;

    detecting whether said object from said input image exists with each of said divided view field areas; and

    updating divided view field areas of the reference background image in which said object is not detected.

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