Background light intensity compensation circuit for a line scan

Details Background light intensity compensation circuit for a line scan Background light intensity compensation circuit for a line scan

1979-07-25

1981-01-06

Cook, Daryl W.

Registers

Coded record sensors

Particular sensor structure

434358, 250466, G06K 714, G06K 710

Patent

active

042438764

ABSTRACT:
In a line scan camera system employed to extract information from marks or characters on a document, a memory circuit is used to store the average white and black video output from the camera so that a given white-to-black transition can be compared to adaptive white and black references to compensate for variations in document background light intensity and vignetting associated with the lens of the line scan camera system.

REFERENCES:
patent: 3560751 (1971-02-01), Buettner et al.
patent: 3628031 (1971-12-01), Azure, Jr.
patent: 3692983 (1972-09-01), Cucciati et al.
patent: 3789215 (1974-01-01), Penny
patent: 3820068 (1974-06-01), McMillin
patent: 4020357 (1977-04-01), Punis
patent: 4047023 (1977-09-01), Key et al.

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