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Method and apparatus for alignment of images for template elimination

  • US 5,793,887 A
  • Filed: 06/30/1995
  • Issued: 08/11/1998
  • Est. Priority Date: 11/16/1993
  • Status: Expired due to Fees
First Claim
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1. A method of aligning a reference template image with a filled-in template image comprising the steps of:

  • a) correlating lines in said reference template image to lines in said filled-in template image by finding corresponding pairs of projections in a first direction of said lines;

    b) determining a displacement of the two projections of lines of each of said corresponding pairs in a second direction perpendicular to said first direction and evaluating the number of picture elements each line of said filled-in template image has to be shifted to achieve a match between said pairs of projections, said step of determining including using f(a,b)=1+MIN(a,b), where a represents picture elements in each of said lines in said reference template and b picture elements in each of said lines in said filled-in template, as a matching function to evaluate quality of said match; and

    c) generating a new input image by shifting the picture elements of lines of said filled-in template image perpendicular to said first direction using the determined displacement.

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