Image reading apparatus

Details Image reading apparatus Image reading apparatus

1990-03-12

1992-04-14

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358483, 358461, H04N 138

Patent

active

051052865

ABSTRACT:
An image reading apparatus includes a plural number of line image sensors disposed on a read line, a background detection circuit for detecting a background level of an original document on the basis of an image signal from a sample portion of a reference line image sensor as a line image sensor facing the original document. The sample portion is predetermined as a portion facing the original document. The apparatus also includes a conversion circuit for converting image signals output from the line image sensors, into image data expressed as a relative level when the background level detected by the background detection circuit is used as a white reference level.

REFERENCES:
patent: 4001500 (1977-01-01), Lavery et al.
patent: 4539600 (1985-09-01), Takahashi et al.
patent: 4578715 (1986-03-01), Yamaguchi
patent: 4641357 (1987-02-01), Satoh
patent: 4835618 (1989-05-01), Shimizy
patent: 4868685 (1989-09-01), Ueno
patent: 4974098 (1990-11-01), Miyakawa et al.

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