High density two-dimensional bar code symbol

Details High density two-dimensional bar code symbol High density two-dimensional bar code symbol

1990-01-05

1994-04-19

Weinhardt, Robert A.

Registers

Coded record sensors

Particular sensor structure

235456, G06K 710

Patent

active

053047869

ABSTRACT:
A nonvolatile electro-optical read-only memory includes a substrate on which is printed (or otherwise inscribed) a complex symbol or "label" with a high density two-dimensional symbology, a variable number of component symbols or "codewords" per row, and a variable number of rows. Codewords in alternating rows are selected from mutually exclusive subsets of a mark pattern such as a (17,4) mark pattern. The subsets are defined in terms of particular values of a discriminator function, which is illustrated as being a function of the widths of bars and spaces in a given codeword. In the illustrated embodiment, each subset includes 929 available codewords; that, plus a two-step method of decoding scanned data, permitting significant flexibility in defining mappings of human-readable symbol sets into codewords. The memory may be used in conjunction with a scanner and a suitable control system in a number of applications, e.g., robotic operations or automated microfilm searching.

REFERENCES:
patent: 3832686 (1974-08-01), Bilgutay
patent: 4283622 (1981-08-01), Passer et al.
patent: 4707612 (1987-01-01), Martin
patent: 4782221 (1988-11-01), Brass et al.
patent: 4786792 (1988-11-01), Pierce et al.
patent: 4794239 (1988-12-01), Allais
patent: 4889982 (1989-12-01), Young et al.
patent: 4926035 (1990-05-01), Fujisaki
patent: 4939354 (1990-07-01), Priddy et al.
patent: 4947383 (1990-08-01), Hudson
The Characteristics and Decodability of the Universal Product Code Symbol by D. Savir and G. J. Laurer, IBM Systems Journal vol. 14, No. 1, pp. 16-34, 1975.
The title page, the table of contents, and Chapters 3 & 4 of Error Control Coding: Fundamentals and Applications by Shu Lin and Daniel J. Costello, Jr., Prentice-Hall, 1983.
The title page, the table of contents, Chapter 1, 2, Sections 2 & 3 and Chapter 3, Sections 5-9 of Time Warps, String Edits and Macromolecules: The Theory and Practice of Sequence Comparison, edited by D. Sankoff and J. B. Kruskal, Addison-Wesley, 1983.
Allais, David, "Code 49 (Revision C) Symbology Description and Explanation," cover date Dec. 9, 1987.
Bobker, Steven, "The Software Strip," MacUser Magazine, Apr. 1986.
ICS Identcode-Systeme, "Code A Block Identcode MLS-2D Description Jul. 1989".
ICS Identcode-Systeme, "Identcode MLS-2D Specification Copyright IBO-1280689".
Laserlight Systems, Inc., "Code 16K," running header date Oct. 6, 1988.
Pavlidis, Theo, "Getting the Most from Your Bar Code Real Estate, or, Information Theoretical Aspects of Bar Coding," Nov. 3, 1988.
SCAN Newsletter, Ltd., Nov., 1989.
Vericode Identification System-The Electronic Fingerprint (undated).

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