Bar code reading method and apparatus

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

1986-01-02

1987-08-18

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235462, G06F 710

Patent

active

046879129

ABSTRACT:
Bar code reading method and apparatus which is insensitive to scanning speed and to minor variations in width, caused by inaccurate printing, between like bars and spaces and which is suitable in particular to hand held manual scanners. The width of all the bars and spaces in a bar code are measured and stored in a memory. Selected ones of the stored measured width values are summed up to provide one or more sum values. For each bar and space whose binary status "0" or "1" is to be determined, a respective quotient is generated by dividing one of the stored sum values by the measured width of the bar or space whose binary status is being determined. The quotient, thus obtained, is compared to a prestored reference constant and on that basis the binary status of the bar or space is ascertained.

REFERENCES:
patent: 4411016 (1983-10-01), Wakezand

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