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

1988-03-25

1989-10-24

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358228, H04N 5232

Patent

active

048766038

ABSTRACT:
A signal processor for an AF video signal in an electronically controlled camera, comprising: a photosensor (20) of the self-scanning type having an electric charge accumulating part (PD) for accumulating signal electric charge therein which corresponds to the object brightness, an exposure monitor (M1', M2', M3') for accumulating electric charge therein which corresponds to the amount of the signal electric charge accumulated in said electric charge accumulating part, and a dark charge monitor (DM1') for accumulating dark charge therein, said photosensor being adapted to sequentially transmit the signal electric charge accumulated in said electric charge accumulating part for transfer to an A/D converter (34); and an automatic gain control circuit (37) for amplifying, thereby automatically gain-controlling, the AF video signal produced from said photosensor when said object contrast is low, in such a manner that a low-contrast 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 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: 4500925 (1985-02-01), Hanma et al.
patent: 4609944 (1986-09-01), Nakada et al.

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