Bar code reading method and apparatus

Details Bar code reading method and apparatus Bar code reading method and apparatus

1985-10-17

1988-07-12

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235436, 235463, G06K 710

Patent

active

047572060

ABSTRACT:
A bar code reading method and apparatus. Comparison reference values are calculated based upon actual measurements of the width of bars and spaces which comprise the bar code pattern and upon a prestored constant. The measured bar and space widths are compared to the reference values to determine the information represented by the bar code. Since the reference values are generated from the measured values of the bars and spaces the scanning speed is irrelevant and errors are avoided. Similarly, minor width variations, caused by inaccurate printing, between like bars or spaces do not affect reading results.

REFERENCES:
patent: 4147295 (1979-04-01), Nojiri et al.
patent: 4528443 (1985-07-01), Smith
patent: 4578570 (1986-03-01), Mazumder et al.

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