Method of and arrangement for correcting vignetting

Details Method of and arrangement for correcting vignetting Method of and arrangement for correcting vignetting

1992-10-08

1995-01-10

Mancuso, Joseph

Television

Camera, system and detail

Camera connected to computer

348335, 348336, 348571, 348587, 348590, 348607, H04N 530, H04N 514

Patent

active

053811747

ABSTRACT:
For correcting vignetting in the upper or lower range of the pick-up area of optoelectric transducers of a multichannel color television camera with zoom lens are described, a representative signal is derived from the diaphragm aperture setting and from the zoom setting. Dependent on corresponding signals for the minimum diaphragm aperture, on the one hand, and the minimum values for wide-angle and telesetting of the zoom range, on the other hand, these representative signals generate control voltages with which the level of a field frequency sawtooth signal is controlled. Finally, this sawtooth-shaped control signal influences the video signal of each chrominance channel in the sense of a vignetting compensation.

REFERENCES:
patent: 4733296 (1988-03-01), Honbo et al.
patent: 4855814 (1989-08-01), Shiraishi et al.

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