Analog reconstruction circuit and bar code reading apparatus emp

Details Analog reconstruction circuit and bar code reading apparatus emp Analog reconstruction circuit and bar code reading apparatus emp

1992-01-10

1994-03-15

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

435463, G06K 710

Patent

active

052947831

ABSTRACT:
A bar code detection circuit accepts as input the discretized analog output of a CCD array, and performs piecewise linear reconstruction to produces a continuous polylinear output signal. In the region of a bar/space transition, the output signal is a close approximation of the reflectance function of a bar code symbol convolved with the system transfer function of the bar code reader. Linear interpolation is performed in order to determine the offset of a given threshold value from an edge of the CCD analog output.

REFERENCES:
patent: 3892950 (1975-07-01), Dodson, III
patent: 3909594 (1975-09-01), Allais
patent: 4096992 (1978-06-01), Nojiri et al.
patent: 4335301 (1982-06-01), Palmer et al.
patent: 4682015 (1987-07-01), Ouan
patent: 4833309 (1989-05-01), Yomogida

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