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System and method for using normalized gray scale pattern find

  • US 20040136611A1
  • Filed: 01/09/2003
  • Published: 07/15/2004
  • Est. Priority Date: 01/09/2003
  • Status: Active Grant
First Claim
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1. A system for utilizing a normalized gray scale pattern find within a machine vision system, the system comprising:

  • (a) means for correlating a reference image having a first spatial resolution having no particular degree of rotation within a first search region of interest of an acquired image to find a potential match location;

    (b) means for correlating a rotated reference image having the first spatial resolution at a particular degree of rotation within the first search region of interest to find a potential match location;

    (c) means for selecting the potential match location and the particular degree of rotation corresponding to the highest correlation value;

    (d) means for increasing the spatial resolution of the reference image at the particular degree of rotation to generate a new reference image and correlating the new reference image within a second search region of interest centered at the selected potential match location;

    (e) means for selecting an updated potential match location corresponding to a location having the highest correlation value that is completely within the search region of interest;

    (f) means for repeating steps (d) and (e) for all available resolutions for the reference image. (g) means for selecting a match location and orientation of a reference image within the acquired image corresponding to the location having the highest correlation value.

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