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Apparatus for eliminating background noise

  • US 8,497,924 B2
  • Filed: 04/27/2011
  • Issued: 07/30/2013
  • Est. Priority Date: 04/27/2011
  • Status: Active Grant
First Claim
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1. An apparatus for eliminating background noise from a security marker authenticating system comprising:

  • a sensor which captures an image of a background with a security marker;

    a light source illuminating the security marker;

    wherein the sensor captures a plurality images of an optical response of the security marker;

    a computer which averages the plurality of optical response images;

    wherein the computer smoothes the background image; and

    wherein the computer subtracts the smoothed background image from the average of the plurality of optical response images.

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