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Techniques for reading postal code

  • US 6,176,428 B1
  • Filed: 04/07/1999
  • Issued: 01/23/2001
  • Est. Priority Date: 04/07/1999
  • Status: Expired due to Term
First Claim
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1. A method for identifying and reading postal code in image data obtained by an optical code reader, the postal code including a clock track of regular, parallel bars, comprising the steps of:

  • defining a subregion in the image data which contains a characteristic indicative of the presence of postal code therein;

    using image data from the subregion identifying within the image data a baseline which crosses the clock track of the postal code from one margin of the postal code to the other;

    locating bars intersecting the baseline;

    tracking each bar above and below the baseline to obtain a string of states based on bar length; and

    decoding the string of states.

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