System for encoding and decoding data in machine readable graphi

Details System for encoding and decoding data in machine readable graphi System for encoding and decoding data in machine readable graphi

1992-03-16

1993-09-07

Cain, David

Cryptography

Electric signal modification

Having production of printed copy

380 55, 380 3, 380 59, 235462, H04L 900

Patent

active

052436551

ABSTRACT:
A system for representing and recognizing data in machine readable graphic image form in which data to be encoded is entered into the system and a processor encodes the data into a two-dimensional bar code symbol and generates transfer drive signals representative of the symbol. A transferring device such as a printer transfers an image of the two-dimensional bar code symbol onto a carrier such as a card or paper document in response to the transfer drive signals. A recognition device converts the image on the carrier into electrical signals representative of the symbol by scanning the image. A low-level decoder decodes the signals by decoding each scan line into a vector of codeword values corresponding to the codewords in the two-dimensional bar code symbol, assigning a row number to each of the codeword values, and then filling in a two-dimensional matrix with the codeword values. A high-level decoder further decodes the codeword values into data which can then be output for processing or use.

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