Systems utilizing a high density two dimensional bar code symbol

Details Systems utilizing a high density two dimensional bar code symbol Systems utilizing a high density two dimensional bar code symbol

1993-09-27

1995-03-21

Willis, Davis L.

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

053998464

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.

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