Image reading device that adjusts for weakening of scanner...

Details Image reading device that adjusts for weakening of scanner... Image reading device that adjusts for weakening of scanner...

2005-10-04

2005-10-04

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S500000, C358S505000, C358S518000, C382S169000

Reexamination Certificate

active

06952285

ABSTRACT:
A reference image signal level curve V1and a predetermined coefficient are provisionally stored in a ROM of a main controller. The predetermined coefficient provides a threshold level curve by multiplying by the curve V1. A white color image signal level curve V2is formed upon reading a white reference surface by optical sensors. The white color image signal level curve V2is compared with the reference image signal curve V1. If at least a part of the curve V2is not coincident with at least a part of the curve V1, the curve V1is multiplied by ΔV percent, and this percentage is stored in a RAM. These are performed repeatedly until a part of the curve V2is coincident with a part of the curve V1as a result of increase in cumulative ΔV percent. Thus, a correction coefficient K is determined based on the cumulative ΔV percent to provide a corrected image signal level curve. The corrected image signal level curve is compared with the threshold level curve to obtain a binary image data.

REFERENCES:
patent: 4991116 (1991-02-01), Hohner
patent: 5479585 (1995-12-01), Komagine
patent: 5652412 (1997-07-01), Lazzouni et al.
patent: 5721626 (1998-02-01), Kimura
patent: 5796865 (1998-08-01), Aoyama et al.
patent: 6115136 (2000-09-01), Tsukamoto et al.
patent: 6115150 (2000-09-01), Nakamura et al.

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