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Intruding object detection method and intruding object monitor apparatus which automatically set a threshold for object detection

  • US 7,035,430 B2
  • Filed: 10/26/2001
  • Issued: 04/25/2006
  • Est. Priority Date: 10/31/2000
  • Status: Active Grant
First Claim
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1. An object detection method for detecting an object present in an image obtained from an imaging device by comparing at least two images, comprising the steps of:

  • generating a first comparison image representing a result of comparison made between a first input image from said imaging device and a reference image stored in a storage device;

    threshold-processing said first comparison image using a predetermined threshold value, changing said threshold value until a noise level of said threshold-processed image becomes not greater than a predetermined value and setting the threshold value with which the noise level of said threshold-processed image becomes not greater than the predetermined value, as a first threshold value;

    generating a second comparison image which represents a result of comparison made between a second input image including an object from said imaging device and said reference image stored in said storage device;

    threshold-processing said second comparison image using a predetermined threshold, changing said threshold until the size of the object in the threshold-processed image becomes not greater than a predetermined value and setting the threshold value with which the size of said object in said threshold-processed image becomes not greater than the predetermined value, as a second threshold value;

    setting a third threshold value within a range including said first and second threshold values anddetecting an object based on said third threshold value.

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