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Method and apparatus for determining image similarity and position

  • US 6,154,566 A
  • Filed: 05/15/1997
  • Issued: 11/28/2000
  • Est. Priority Date: 05/15/1996
  • Status: Expired due to Term
First Claim
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1. An image processing apparatus for determining a similarity between first image data and second image data conprising:

  • an edge direction unit for determining an edge direction at each pixel of said first image data and an edge direction at each pixel of said second image data;

    an edge magnitude unit for determining an edge magnitude at each pixel of one of said images; and

    a similarity unit for determining a similarity between said first and second images by reducing a background contrast by using the edge directions and magnitudes for each pixel of said one image and edge directions for each pixel of the other of said images.

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