Image reading apparatus

Details Image reading apparatus Image reading apparatus

1989-01-23

1990-09-04

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358453, 358451, 358468, H04N 104

Patent

active

049549138

ABSTRACT:
An image reading apparatus providing boundary shading correction includes reading circuitry for reading an image line by line and outputting image data, a first moving device for repeatedly moving the reading position of the reading circuitry in a main scanning direction a plurality of times, and a second moving device for moving the reading position of the reading circuitry in a subscanning direction every time the reading position of the reading circuitry is moved in the main scanning direction. Detection circuitry is provided for detecting a difference between image data outputted from the reading circuitry during a preceding movement of the reading position in the main scanning direction and image data outputted from the reading circuitry during a current movement of the reading position in the main scanning direction. Finally, correction circuitry is provided for correcting the image data outputted from the reading circuitry based on the difference detected by the detection circuitry.

REFERENCES:
patent: 3976982 (1976-08-01), Eiselem
patent: 4282550 (1981-08-01), Coviello
patent: 4580171 (1986-04-01), Arimoto
patent: 4631596 (1986-12-01), Yaguchi
patent: 4723172 (1988-02-01), Matsumoto

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