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Method and apparatus for flash correlation

  • US 5,583,950 A
  • Filed: 09/29/1994
  • Issued: 12/10/1996
  • Est. Priority Date: 09/16/1992
  • Status: Expired due to Term
First Claim
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1. A method of comparing an unknown pattern of dispersed elements of varying intensity values and a known pattern of dispersed elements of varying intensity values to determine the presence or absence of an artifact indicative of a similarity between the unknown and known patterns, said method comprising the steps:

  • a) overlaying in the spatial domain the unknown and known patterns and rotating one of the known and unknown patterns with respect to the other about a point, so that the known and unknown patterns are rotationally unaligned, to produce a composite pattern of the combined elements therefrom;

    b) sensing first and second average intensities respectively of all of the combined elements within a first area of said composite pattern and of all of the combined elements within a second area of said composite pattern disposed about said first area; and

    c) detecting the presence of said artifact produced by the combined elements of the composite pattern by determining a variation between said first and second average intensities greater than a selected threshold value and detecting the absence of said artifact by determining a variation of said first and second average intensities not greater than said selected threshold value;

    wherein the presence of an artifact is indicative of a similarity between the unknown and known patterns.

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