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Use of correlation histograms for improved glyph decoding

  • US 6,714,677 B1
  • Filed: 12/17/1999
  • Issued: 03/30/2004
  • Est. Priority Date: 12/17/1999
  • Status: Expired due to Term
First Claim
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1. A method of decoding a plurality of glyphs comprising the steps of:

  • capturing an image of a group of said glyphs to form image data for expected glyph locations;

    for at least a portion of the image data indicating a subset of expected glyph locations;

    assigning, for each location in the subset, a first value indicative of the likelihood that location contains a glyph in a first state;

    assigning, for each location in the subset, a second value indicative of the likelihood that location contains a glyph in a second state;

    determining a difference value indicating a difference between said first and second values for each expected glyph location;

    producing a distribution analysis of counts of expected glyph locations for each difference value; and

    setting a decoding threshold based on said distribution analysis, and decoding the plurality of glyphs using the decoding threshold.

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