Image forming apparatus and calibration reference chart

Details Image forming apparatus and calibration reference chart Image forming apparatus and calibration reference chart

2005-12-29

2009-06-09

Haskins, Twyler L. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S518000, C358S520000, C358S517000, C345S589000

Reexamination Certificate

active

07545536

ABSTRACT:
Based on a read value of a calibration reference chart including achromatic patches and chromatic patches having different concentrations and a reference value of the calibration reference chart, a masking coefficient according to each hue area is calculated. A gradation conversion is performed on an image signal output from an image reading unit. The image signal is corrected based on the masking coefficient. Consequently, it is possible to reduce a difference in performance of a scanner between units.

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patent: 2003-60928 (2003-02-01), None
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