Image reading unit with black level control

Details Image reading unit with black level control Image reading unit with black level control

1988-08-29

1990-03-06

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

35821316, H04N 516

Patent

active

049070843

ABSTRACT:
An image scanner for reading images from an original document or the like less susceptible to induced noise. An image output signal from a CCD sensor is sampled and held and the black level of the resulting signal is adjusted to a desired value. The black-level-adjusted signal is converted to digital form and transmitted to an external utilization unit after its timing has been properly adjusted.

REFERENCES:
patent: 3947631 (1976-03-01), Rhee et al.
patent: 4404462 (1983-09-01), Murray
patent: 4484223 (1984-11-01), Tsunekawa
patent: 4689679 (1987-08-01), Hinn
patent: 4704633 (1987-11-01), Matsumoto
patent: 4786969 (1987-03-01), Shouji et al.

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