Is a
Patent attributes
Current Assignee
0
Patent Jurisdiction
Patent Number
Patent Inventor Names
Koji Hayashi0
Date of Patent
June 9, 2009
0Patent Application Number
113196790
Date Filed
December 29, 2005
0Patent Primary Examiner
Patent 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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