Image input method and apparatus

Details Image input method and apparatus Image input method and apparatus

1995-12-11

1998-07-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358407, 358463, 358513, 348272, H04N 104

Patent

active

057813124

ABSTRACT:
An image input apparatus capable of reliably reducing random noise and switching noise arising during a dummy pixel period using a simple circuit configuration and providing a high-quality video signal without horizontal lines. The image input apparatus is provided with a clamping circuit made up of a capacitor for feeding an analog image signal supplied from a CCD solid-state image pickup element via a first amplifier to a second amplifier through an alternating-current link, a reference voltage source for generating a predetermined reference voltage VR, and a first switch for effecting switching during the dummy pixel period of the CCD solid-state image pickup element. The clamping circuit is further provided with a resistor disposed between the capacitor and the second amplifier, and a second switch for selectively bridging across the resistor 152. This second switch is complimentarily activated in relation to the operation of the first switch.

REFERENCES:
patent: 4682211 (1987-07-01), Kaji
patent: 4914519 (1990-04-01), Hashimoto
patent: 5216509 (1993-06-01), Hirasawa
patent: 5483295 (1996-01-01), Kim et al.

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