Video signal white level corrector

Details Video signal white level corrector Video signal white level corrector

1982-04-19

1984-12-04

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 530, H04N 521

Patent

active

044867816

ABSTRACT:
A video signal white level corrector wherein a digital memory is used to store a correction signal which is applied to a signal multiplier to remove white level shading which results from optic and beam misalignment of a scanner. Video signals are applied to a multiplier 10, the output therefrom being the corrected video signal. The correction signal is stored for future use in a digital memory 14 after being compared to a reference voltage at comparator 20. In a first, or "store", mode, the output from the comparator 20 is coupled to an integrator 22, the output of which increases or decreases the gain of multiplier 10. In a second, or "operate", mode, the output from the digital memory is coupled to integrator 22 to also control the gain of multiplier 10.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran
patent: 3800079 (1974-03-01), McNeil
patent: 3830972 (1974-08-01), Siverling
patent: 4193093 (1980-03-01), ST. Clair
patent: 4343021 (1982-08-01), Frame

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