Two dimensional data encoding structure and symbology for use wi

Details Two dimensional data encoding structure and symbology for use wi Two dimensional data encoding structure and symbology for use wi

1995-05-15

1997-01-07

Hajec, Donald T.

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Particular code pattern

235462, G06K 710

Patent

active

055919561

ABSTRACT:
A two dimensional (2D) matrix symbology for use with bar code and other optical readers. A finder structure includes a center square and a plurality of nested squares having centers that approximately coincide with the center square. A symbol descriptor located adjacent to the finder structure encodes data indicating the size of the symbol and the length of the message encoded therein. A reference grid extends throughout the symbol to facilitate the location of individual data elements with respect to the finder structure thereof. The data structure of the symbol is filled with data blocks which are organized into layers which surround the finder structure. Data encoded in the data blocks may be read sequentially within layers and between layers. The symbology is a versatile symbology in that the number of check data blocks is user selectable to provide the desired level of error correction.

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