Method and apparatus for locating and decoding machine-readable

Details Method and apparatus for locating and decoding machine-readable Method and apparatus for locating and decoding machine-readable

1996-05-29

1998-04-21

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

057420416

ABSTRACT:
A method and apparatus for locating and decoding machine-readable symbols such as Data Matrix symbols begins by storing an image of the symbol. The invention locates an edge point between the quiet zone and a solid boundary of the finder pattern for the symbol. Therefrom, the present invention locates at least portions of first and second solid boundaries, and preferably a solid corner therebetween. Thereafter, the present invention locates at least portions of dashed boundaries extending from the free ends of the solid boundaries. After locating the solid and dashed boundaries of the finder pattern for the symbol, the present invention determines the periphery and version of the symbol, and then applies the appropriate decode routine to decode the image of the symbol.

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