Image reading means with controllable shading correction

Details Image reading means with controllable shading correction Image reading means with controllable shading correction

1986-08-12

1989-04-11

Blum, Theodore M.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514, H04N 5228

Patent

active

048210994

ABSTRACT:
There is disclosed an image reader capable of releasing constant output regardless of fluctuation in circumferential factors. Output of the image sensor is amplified by an amplifier, of which the factor of amplification is regulated to provide a predetermined level when the image sensor reads a reference image.

REFERENCES:
patent: 3568151 (1971-03-01), Majima
patent: 4408231 (1983-10-01), Bushaw et al.
patent: 4556916 (1985-12-01), Matsunawa
patent: 4675533 (1987-06-01), Shimizu
patent: 4691365 (1987-09-01), Nagashima

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