Method and apparatus for decoding two-dimensional bar code using

Details Method and apparatus for decoding two-dimensional bar code using Method and apparatus for decoding two-dimensional bar code using

1992-03-16

1994-06-07

Dolinar, Andrew M.

Registers

Coded record sensors

Particular sensor structure

G06K 710, G06K 900

Patent

active

053191811

ABSTRACT:
A method and apparatus for decoding a two-dimensional bar code symbol using a charge-coupled device (CCD) camera or a charge-modulation device (CMD) camera. The CCD/CMD camera takes pictures of the symbol and the picture is converted into digital data. The location and orientation of the two-dimensional bar code symbol is determined and verified. Defects and damages on the symbol are detected and corrected. The symbol is scanned to read the codewords of the two-dimensional bar code symbol.

REFERENCES:
patent: 3774014 (1973-12-01), Berler
patent: 4794239 (1988-12-01), Allais
patent: 4988852 (1991-01-01), Krishnan
patent: 5124537 (1992-06-01), Chandler et al.
Wang et al., "Postal Applications of a High Density Bar Code" (Sep. 1990) (Symbol Technologies).
Wang "PDF417 Specification" (1991) Symbol Technologies, Inc. month unknown.

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