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Detection of a concealed object

  • US 7,834,802 B2
  • Filed: 04/28/2008
  • Issued: 11/16/2010
  • Est. Priority Date: 03/16/2001
  • Status: Expired due to Term
First Claim
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1. A method, comprising:

  • detecting electromagnetic radiation returned from a concealed surface associated with a person;

    generating image data from the detected electromagnetic radiation;

    segmenting the image data into image portions;

    performing a Fourier transform on each of the image portions;

    identifying the presence of a man-made object in one or more of the image portions based on spatial frequencies in the Fourier-transformed image portions, wherein the identifying the presence of the man-made object comprises applying at least one extraction filter to the image portion, thereby extracting features from the image portions, wherein the at least one extraction filter is a rotationally invariant extraction filter or a scale invariant extraction filter; and

    communicating the presence of the man-made object.

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