Method of reading a barcode representing encoded data and dispos

Details Method of reading a barcode representing encoded data and dispos Method of reading a barcode representing encoded data and dispos

1994-09-23

1996-04-23

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

055106048

ABSTRACT:
In a method of, and apparatus for, reading a barcode, a barcode symbol is optically scanned into a memory (13), and a plurality of scans across the stored image are made and processed to determine the barcode. The scans are made at interleaved positions across the barcode, and are stored in a storage device (87) and tested in a testing unit (88) for a consensus of at least 2 scans, further scans being made if necessary. Preferably, more than half the scans should be in matching agreement to determine that a consensus has been reached. Each scan may be averaged from several sub-scans. The scans may be decoded into symbols. Various validity tests may be made on the scans. The scans are analysed by measuring the positions of the black-to-white and white-to-black transitions in them; the positions of the transitions may be interpolated between pixel positions.

REFERENCES:
patent: 4044227 (1977-08-01), Holm et al.
patent: 4873426 (1989-10-01), Sarna et al.
patent: 5216231 (1993-06-01), Ouchi
patent: 5268580 (1993-12-01), He Duanfeng
IBM Technical Disclosure Bulletin, vol. 36, No. 06A, Jun. 1993, New York, USA, pp. 241-246, XP 000372419, "Locating and Recognizing Barcodes on Scanned-in Forms".
AT&T Global Information Solutions Company (fka NCR Corporation) Patent Application Ser. No. 07/960,177, filed Oct. 9, 1992, Docket No. 4574-B.

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