Image reading apparatus having amplification factors vary in res

Details Image reading apparatus having amplification factors vary in res Image reading apparatus having amplification factors vary in res

1988-07-08

1990-12-18

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 80, 358464, H04N 146

Patent

active

049790277

ABSTRACT:
An image reading apparatus has an image scanner for photoelectrically reading an original image and outputting an image signal representing the original image and an amplifier for amplifying the image signal output from the image scanner. The image scanner reads the original image in units of lines and outputs a serial output signal. The amplification factor of the amplifier is changed in accordance with a frequency of the input image signal.

REFERENCES:
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patent: 4647961 (1987-03-01), Kammoto et al.
patent: 4734762 (1988-03-01), Aoki et al.
patent: 4736251 (1988-04-01), Sasaoka
patent: 4751567 (1988-06-01), Hashimoto
patent: 4839739 (1989-06-01), Tachiuchi et al.
patent: 4862286 (1989-08-01), Suda et al.
patent: 4891690 (1990-01-01), Hasegawa et al.

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