Vertical aperture correction circuit

Details Vertical aperture correction circuit Vertical aperture correction circuit

1980-12-17

1982-06-22

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358162, H04N 9535, H04N 514

Patent

active

043365523

ABSTRACT:
A video signal, such as may be generated by a television camera, is subjected to a delay, and then combined with a relatively undelayed version thereof, the combined signal being supplied to a clipping circuit, which passes at least that portion thereof that exceeds a predetermined clipping level, and also to a slicing circuit, which passes at least that portion thereof that is less than the predetermined clipping level. A mixing circuit mixes the video signal with the outputs of the clipping and slicing circuits, thereby to provide a vertical aperture-corrected output video signal which is substantially free of periodic fluctuations that might be present in the amplitude of the original video signal. A preferred use of this vertical aperture correction circuit is with a color image pickup device of the type which generates a video signal having a superimposed periodic, fluctuating index signal thereon that produces a line-crawling effect in the ultimately produced video picture.

REFERENCES:
patent: 3919470 (1975-11-01), Blom et al.

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