Signal processing device for automatic-focusing video signal in

Details Signal processing device for automatic-focusing video signal in Signal processing device for automatic-focusing video signal in

1989-08-22

1991-04-02

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, H04N 5232, G03B 300, G03B 1318

Patent

active

050050877

ABSTRACT:
A signal processor for an AF video signal in an electronically controlled camera, including: a photosensor of the self-scanning type having an electric charge accumulating part for accumulating electric charge therein which corresponds to object brightness, an exposure monitor for accumulating electric charge therein which corresponds to the amount of signal electric charge accumulated in the electric charge accumulating part, and a dark charge monitor for accumulating dark charge therein. The photosensor is adapted to sequentially transmit the signal electric charge accumulated in the electric charge accumulating part for transfer to an A/D converter, and an automatic gain control circuit is provided for amplifying, and thereby automatically gain controlling, the AF video signal produced from the photosensor when the object contrast is low, in such a manner that a low-contract corresponding level difference, which is the difference between a high-luminance corresponding level and low-luminance corresponding level of an AF video signal arising from a low-contrast object, approaches a high-contrast corresponding level difference, which is the difference between a high-luminance corresponding level and a low-luminance corresponding level of an AF video signal arising from a high-contrast object.

REFERENCES:
patent: 4410258 (1983-10-01), Aoki et al.
patent: 4876603 (1989-10-01), Suzuki et al.

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