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Method for enhancing the reliability of output data from a label reader

  • US 4,175,693 A
  • Filed: 03/29/1978
  • Issued: 11/27/1979
  • Est. Priority Date: 04/07/1977
  • Status: Expired due to Term
First Claim
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1. A method for enhancing the reliability of the output data from a label reader having a scanner and adapted to read a bar code consisting of a plurality of bars comprising the steps of:

  • obtaining a set of binary signals, each signal in said set being representative of a particular different point along a particular bar as scanned by the scanner;

    forming a first sum equal to the number of binary "1" signals in said set;

    forming a second sum equal to the number of binary "0" signals in said set;

    computing the ratio (R) of said first sum to said second sum;

    providing a binary "1" output decision for the particular bar if R>

    (1+α

    ) where α

    >

    0;

    providing a binary "0" output decision for the particular bar if R>

    (1-β

    ) where 0<

    β

    <

    1; and

    determining that a reliable output decision cannot be made for the particular bar if (1-β

    )≦

    R≦

    (1+α

    ).

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