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Apparatus and method for determining the location and orientation of a reference feature in an image

  • US 6,240,218 B1
  • Filed: 03/14/1995
  • Issued: 05/29/2001
  • Est. Priority Date: 03/14/1995
  • Status: Expired due to Term
First Claim
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1. A method for determining the location and orientation of a reference feature in an image, the method comprising:

  • acquiring at least one run-time image having a reference feature, the reference feature including a plurality of substantially straight lines;

    determining from said at least one run-time image a principal axis of said reference feature such that the principal axis is parallel to most of the substantially straight lines of the reference feature, said principal axis being oriented at a principal angle; and

    performing projection upon the reference feature at said principal angle by summing substantially along each substantially straight line of the plurality of substantially straight lines to provide a one-dimensional feature image of the reference feature;

    performing a global match of said one-dimensional feature image with a one-dimensional template image to provide a position value of said global match; and

    using said position value to determine the location of said reference feature.

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