Two-dimensional bar code symbology using gray code encodation sc

Details Two-dimensional bar code symbology using gray code encodation sc Two-dimensional bar code symbology using gray code encodation sc

1996-10-16

1999-09-28

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235494, G06K 710

Patent

active

059592850

ABSTRACT:
A electro-optical memory includes a substrate on which is printed (or otherwise inscribed) a complex symbol or "label" or "bar code" with a high density two-dimensional symbology utilizing gray coding scheme for at least part of its content. The bar code contains component symbols or "codewords" placed in row and column formation, a variable number of codewords per row, and a variable number of rows. Codewords indicating spacial arrangement are encoded using gray code, and codewords representing actual information are encoded using any two-dimensional code having at least three subsets of codewords, with each subset containing a full information character set. The memory may be used in conjunction with a scanner and a suitable control system in a number of applications, e.g., robotics operations or automated object searching.

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"PDF417 Specification" as submitted to AIM's Technical Symbology Committee for review, Symbol Technologies, 1991.

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