Bar code error scanner
First Claim
1. A method of scanning a bar code having a plurality of alternating bars and spaces of varying widths comprising:
- scanning said bar code sequentially across said bars and spaces for providing a bar code signature;
measuring said bar and space widths in said signature as multiples of a minimum width module; and
detecting a fractional width in adjoining ones of said bars and spaces for detecting error in said bar code.
4 Assignments
0 Petitions
Accused Products
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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Citations
22 Claims
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1. A method of scanning a bar code having a plurality of alternating bars and spaces of varying widths comprising:
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scanning said bar code sequentially across said bars and spaces for providing a bar code signature; measuring said bar and space widths in said signature as multiples of a minimum width module; and detecting a fractional width in adjoining ones of said bars and spaces for detecting error in said bar code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A scanner for scanning a bar code having a plurality of alternating bars and spaces of varying widths comprising:
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means for scanning said bar code sequentially across said bars and spaces for providing a bar code signature; means for measuring said bar and space widths in said signature as multiples of a minimum width module; and means for detecting a fractional width in adjoining ones of said bars and spaces for detecting error in said bar code. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification