Color image read apparatus with shading and color balance correc

Details Color image read apparatus with shading and color balance correc Color image read apparatus with shading and color balance correc

1988-05-23

1990-07-31

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 29, 358163, 358 80, H04N 140

Patent

active

049454056

ABSTRACT:
A color image read apparatus which makes efficient color balance correction and shading correction by a simple configuration in a manner that color balance correction of image signals of plural colors of a color image sensor using optoelectric transducers is made in A/D conversion on the basis of a reference voltage for each color, and shading correction thereof is made on the basis of one reference data obtained from image signals of plural colors of a reference white pattern read prior to an original.

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patent: 4554583 (1985-11-01), Saitoh et al.
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patent: 4663662 (1987-05-01), Sekizawa et al.
patent: 4675704 (1987-06-01), Yamamoto
patent: 4734762 (1988-03-01), Aoki et al.
patent: 4745467 (1988-05-01), Sekizawa et al.
patent: 4821099 (1989-04-01), Sakamoto
patent: 4829379 (1989-05-01), Takaki
patent: 4833533 (1989-05-01), Augusti et al.

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