Bar code acquisition utilizing moire patterns

Details Bar code acquisition utilizing moire patterns Bar code acquisition utilizing moire patterns

1991-04-08

1993-03-23

Shepperd, John W.

Registers

Coded record sensors

Particular sensor structure

382 1, G06K 900, G06K 710

Patent

active

051966832

ABSTRACT:
A bar code detector or acquisition arrangement for detecting the presence and location of a bar code pattern in a field of view. The bar code pattern detector is not designed to decode a bar code pattern, but merely to be sensitive to and detect the presence of a bar code pattern or patterns so that a conventional bar code scanner can then be activated to perform a decoding operation thereon. The present invention is based upon the generation of Moire patterns, and includes an electro-optic system for detecting and locating a bar code pattern in which an image of a field of view is projected onto a reference bar code pattern or an image thereof while producing relative rotation between the image of the field of view and the reference bar code pattern or image thereof. An optical detector detects the optical interaction of the image of the field of view with the reference bar code pattern or image thereof, including any Moire patterns generated thereby. A processor is coupled to the output of the optical detector for detecting the generation of any such Moire patterns, which are indicative of the presence and location of a bar code pattern or patterns in the field of view.

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patent: 5120940 (1992-06-01), Willsie

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