High density two dimensional symbology

Details High density two dimensional symbology High density two dimensional symbology

G - Physics

06

K

352/57, 354/67,

G06K 7/00 (2006.01) G06E 1/00 (2006.01) G06E 3/00 (2006.01) G06F 3/00 (2006.01) G06F 9/44 (2006.01) G06F 9/445 (2006.01) G06K 1/12 (2006.01) G06K 7/14 (2006.01) G06K 17/00 (2006.01) G06K 19/06 (2006.01) H04N 1/00 (2006.01) H04N 1/32 (2006.01)

Patent

CA 2026387

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.

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