Reading indicia by analysis of different light reflecting portio

Details Reading indicia by analysis of different light reflecting portio Reading indicia by analysis of different light reflecting portio

1995-07-28

1997-06-10

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235463, G06K 710

Patent

active

056378530

ABSTRACT:
A reader for reading a bar code symbol consisting of badly printed bars on a clean background generates a signal having portions corresponding to the different light reflectivities of the bars and the spaces. Those portions of the signal corresponding to the bars will include high frequency noise components owing to the badly printed bars whereas portions of the signal corresponding to the spaces will be noise-free. The information encoded in the bar code symbol can thus be recovered by identifying the noisy and noise-free portions of the signal.

REFERENCES:
patent: 3900832 (1975-08-01), Hanchett
patent: 5103080 (1992-04-01), Markan
patent: 5446272 (1995-08-01), Barken
patent: 5461223 (1995-10-01), Butturini et al.
patent: 5536927 (1996-07-01), Butturini et al.

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