Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1985-11-14
1988-03-15
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 29, H04N 146, H04N 973, G03F 308
Patent
active
047316616
ABSTRACT:
A color document reader comprises a plurality of different-colored light sources which sequentially illuminate a color document, and a light sensor which receives light reflected from the document. Prior to reading the document, a white balance operation is performed by sequentially illuminating a white reference area with the different-colored light sources and directing light reflected from the document to the light sensor. The peak value of an output signal produced by the light sensor is monitored, and light emission periods for each of the different-colored light sources and corresponding integration periods for the light sensor are determined so that the peak value of the output signal is substantially equal to a predetermined reference value when the white reference area is illuminated by each of the different-colored light sources. The light emission periods are longer than the integration periods to allow the light output of the light sources to stabilize before the integration periods begin. The determined light emission periods and integration periods are stored in a memory, and the light sources and the light sensor are controlled in accordance with the stored light emission periods and integration periods while the color reader reads the color document.
REFERENCES:
patent: 4479143 (1984-10-01), Watanabe et al.
patent: 4500914 (1985-02-01), Watanabe et al.
patent: 4633301 (1986-12-01), Saitoh
patent: 4642679 (1987-02-01), Nagano
patent: 4654723 (1987-03-01), Nagano
patent: 4658289 (1987-04-01), Nagano et al.
patent: 4658303 (1987-04-01), Nagano
patent: 4670779 (1987-06-01), Nagano
Groody James J.
Sharp Kabushiki Kaisha
Svihla Randall S.
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