Shading corrections device with white color reference member per

Details Shading corrections device with white color reference member per Shading corrections device with white color reference member per

1990-08-30

1992-03-31

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358494, 358496, 358498, H04N 110, H04N 112

Patent

active

051012847

ABSTRACT:
In a shading correction device of an image reading machine, for example, a Xerography unit or a thermal transfer unit, a platen roller is provided so as to engage and disengage from a platen glass. A reference white color member is provided. The reference white color member is movable up to a position between the platen glass and the platen roller along the circumferential side of the platen roller and with rotation of the platen roller.

REFERENCES:
patent: 4970606 (1990-11-01), Shima

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