Image reading apparatus

Details Image reading apparatus Image reading apparatus

1992-04-17

1993-01-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358498, 358461, 355234, H04N 140, H04N 104

Patent

active

051794543

ABSTRACT:
An image reading apparatus includes a carrying unit for carrying a sheet original and a book original to a reading position, an original urging member including a reference member, closed when a sheet original is carried by the carrying unit and opened when a book original is carried by the carrying member, a reading unit for reading an image of an original carried to the reading position and the reference member of the original urging member in a closed state, and a correcting unit for correcting nonuniformity of an image signal obtained by reading an original image on the basis of a reference signal obtained by reading the reference number. When the original urging member is open, the correcting unit corrects nonuniformity of an image signal on the basis of the reference signal used upon reading of a previous original image.

REFERENCES:
patent: 4439790 (1984-03-01), Yoshida
patent: 4554592 (1985-11-01), Hattori
patent: 4556915 (1985-12-01), Shibata et al.
patent: 4717963 (1988-01-01), Koizumi
patent: 4745491 (1988-05-01), Kishi et al.
patent: 4766404 (1988-08-01), Ishida et al.
patent: 4870500 (1989-09-01), Nagashima
patent: 4870501 (1989-09-01), Yoshida

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