Segmentation method for use against moving objects

  • US 5,109,435 A
  • Filed: 03/04/1991
  • Issued: 04/28/1992
  • Est. Priority Date: 08/08/1988
  • Status: Expired due to Fees
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First Claim
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1. A method of detecting a moving object in a plurality of image frames taken at different times, each image frame containing the object and background clutter, the method comprising the steps of:

  • a) registering the background of at least three image frames;

    b) determining a median pixel value for each pixel position of the registered image frames to construct a registered image frame representative of only the background of the three image frames without the object;

    c) subtracting the median pixel values from pixels in a selected one of the image frames to form a difference image; and

    d) applying a threshold to the difference image whereby pixel values exceeding a given threshold level are associated with the position of the moving object.

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