Vignetting compensating circuit for a video camera

Details Vignetting compensating circuit for a video camera Vignetting compensating circuit for a video camera

1988-11-02

1989-11-28

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, 358160, 35821313, H04N 5208, H04N 514, H04N 5235, H04N 5335

Patent

active

048841404

ABSTRACT:
A vignetting compensating circuit for a video camera utilizing the horizontal synchronizing signal and the vertical synchronizing signal. The circuit prevents vignetting on the screen from a signal generated by a video camera with a zoom lens by obtaining and adding inverse parabolic wave form voltages corresponding to the cycles of the horizontal synchronizing signal and the vertical synchronizing signal and controlling the amplification factors of a voltage controlled amplifier for the video signal by the added voltage.

REFERENCES:
patent: 3941925 (1976-03-01), Busch et al.
patent: 3989888 (1976-11-01), Busch et al.
patent: 4240103 (1980-12-01), Poetsck et al.
patent: 4628362 (1986-12-01), Waehner
patent: 4639781 (1987-01-01), Rucci et al.
patent: 4665432 (1987-05-01), Shima

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