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Display monitoring system for detecting and tracking an intruder in a monitor area

  • US 5,243,418 A
  • Filed: 11/27/1991
  • Issued: 09/07/1993
  • Est. Priority Date: 11/27/1990
  • Status: Expired due to Term
First Claim
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1. A display monitoring system comprising:

  • image pickup means for picking up an image including at least one of an object to be picked up and a background;

    change detecting means for detecting an area in which a portion of the picked up changes,said change detecting means includingreference image storage means for storing a background image, as a reference image, which corresponds to the background picked u by said image pickup means,difference calculating means for obtaining differences between the reference image and the image including the object and the background, and outputting difference values,binarizing means for binarizing difference values higher than a predetermined threshold value, and extracting the binarized values as a plurality of changing areas, andlabeling means for providing different labels for a plurality of blocks associated with each other as the changing areas, obtaining the area, position of center of gravity, and circumscribed rectangle of each of the blocks, and outputting measurement data;

    tracking means for tracking the changing areas,said tracking means including at least one tracking element havingtracking area setting means which moves upon movement of the block and sets a rectangular area including the rectangle as a tracking area, with the rectangle located in the center of the tracking area,small moving direction detecting area setting means for setting a plurality of small areas in the tracking area, andmoving vector calculating means for calculating movement amounts of the changing areas in accordance with changes in parameter of each of the small areas; and

    display monitoring system control means for controlling said tracking means, performing determination of a tracking result, and performing predetermined processing by using the output from said labeling means,said display monitoring system control means includingtracking section control means for controlling said tracking means andtracking result processing means for determining on the basis of the tracking result from said tracking means whether the changing areas originate from an intruding object, and performing predetermined processing.

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