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EP0043124A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for decoding bar-coded labels

Assignee: EIDP Inc
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Filing: 1981-06-26
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Granted: —
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Expires: 2001-06-26
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Abstract

Abstract A method for reading bar-coded labels by taking ratios of successive bars and spaces, then discriminating and categorizing the ratios of one of four possibilities. This output is combined and decoded into characters using a read-only-memory. The characters along with information on spacing between the characters is then passed to a microprocessor. The microprocessor decides which of the characters are valid and assembles a complete scans worth of information by making use of the data relating to the separation between characters. Handling the data in this fashion provides a means to assemble data from partial scans of the label into one complete scan.

Inventors

  • 👤 David Charles Bullis
  • 👤 Alan George Montross

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 21:12
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/14; G06K7/1404; G06K7/146; G06K7/1491; G06K7/01; G06K7/016; G06K7/0166

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 93 words
A method for decoding bar-coded labels characterized in that separate ratios between adjacent bars and between adjacent spaces are computed from an input data stream of bars and spaces; a two-bit binary code is assigned to each computed ratio in order to classify it as a greater than, less than, equal to or erroneous relation; the resultant string of binary bits of the classified ratios are decoded into corresponding tentative character identifications using associated bar count data; and the tentative character identifications are assembled into a most likely to have occurred character set.
Claim 2
Independent Claim 93 words
A method for decoding bar-coded labels characterized in that separate ratios between adjacent bars and between adjacent spaces are computed from an input data stream of bars and spaces; a two-bit binary code is assigned to each computed ratio in order to classify it as a greater than, less than, equal to or erroneous relation; the resultant string of binary bits of the classified ratios are decoded into corresponding tentative character identifications using associated bar count data; and the tentative character identifications are assembled into a most likely to have occurred character set.
Claim 3
Dependent Claim 51 words
The method as defined in claim 1 wherein computing separate ratios comprises counting the clock pulses of successive bar and space widths then converting count values into log values instantaneously and subtracting successive log values of said adjacent bars and successive log values of said adjacent spaces to obtain said ratios.
Claim 4
Dependent Claim 54 words
The method of claim 2 wherein assigning a two-bit binary code to each computed ratio comprises comparing the ratio values with predetermined limits and assigning two-bit-value weights of 10 for ratios greater than 1, of 01 for ratios less than 1, of 00 for a ratio of 1 and of 11 for erroneous ratio.

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