Image pick-up device correcting offset errors from a plurality o

Details Image pick-up device correcting offset errors from a plurality o Image pick-up device correcting offset errors from a plurality o

1991-11-27

1994-06-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358463, 348241, H04N 104

Patent

active

053215281

ABSTRACT:
A multi-chip linear image sensor for use in, for example, a facsimile machine or a photocopier comprises several chip image sensors, each including photosensors and an output amplifier. To correct for the offset error of the output amplifier caused by processing variations, each chip includes a circuit enabling the amplifier to be isolated, so that its output can be sampled independently of the image signal. To eliminate the offset error a correction circuit is provided as part of the video clamp circuit, for sampling the amplifier output and subtracting it from the subsequent image signals readout through the amplifier.

REFERENCES:
patent: 4580170 (1986-04-01), Levine
patent: 4602291 (1986-07-01), Temes
patent: 4763007 (1988-08-01), Takahashi
patent: 4785353 (1988-11-01), Seim
patent: 4868405 (1989-09-01), Nakamura
patent: 4908875 (1990-03-01), Assael et al.
patent: 4920428 (1990-04-01), Lin
patent: 5105276 (1992-04-01), Schrock
patent: 5157500 (1992-10-01), Gusmano

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