Bar code error scanner

Details Bar code error scanner Bar code error scanner

1996-09-17

1998-06-16

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235494, 235462, G06K 710

Patent

active

057674981

ABSTRACT:
A method and apparatus are disclosed for scanning for a defective bar code having a plurality of alternating bars and spaces of varying widths. A bar code is scanned for providing a bar code signature which is used for measuring the bar and space width as multiples of a minimum width module. By detecting fractional width of adjoining bars and spaces, error in the bar code is correspondingly detected. The measured bar code signature may be corrected by respectively increasing and decreasing the fractional width of an adjoining bar and space for obtaining substantially integer multiple modules thereof. The corrected signature may then be decoded.

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patent: 3969613 (1976-07-01), Vinal
patent: 4146046 (1979-03-01), Dobras
patent: 4757206 (1988-07-01), Ohta
patent: 5036183 (1991-07-01), Ouchi et al.
patent: 5077463 (1991-12-01), Sato
patent: 5412196 (1995-05-01), Surka
patent: 5486689 (1996-01-01), Ackley
patent: 5489767 (1996-02-01), Billington
patent: 5602382 (1997-02-01), Ulvr et al.

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