Image reading apparatus provided with correction for shadings in

Details Image reading apparatus provided with correction for shadings in Image reading apparatus provided with correction for shadings in

1987-03-12

1989-03-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358282, H04N 514

Patent

active

048148776

ABSTRACT:
An image reading apparatus capable of shading correction by correcting obtained image signal of a determined number of bits with a characteristic signal of a smaller number of bits obtained from the same image reading device prior to image reading.

REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 4129853 (1978-12-01), Althauser et al.
patent: 4200934 (1980-04-01), Hofmann
patent: 4212072 (1980-07-01), Huelsman et al.
patent: 4499547 (1985-02-01), Inuiya et al.
patent: 4523229 (1985-06-01), Kanmoto

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