Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Akitoshi Yamada0
Kentaro Yano0
Fumitaka Goto0
Masao Kato0
Date of Patent
September 25, 2007
0Patent Application Number
103685920
Date Filed
February 20, 2003
0Patent Citations Received
Patent Primary Examiner
Patent abstract
Upon outputting halftone image data to an output device, density transformation is prevalently done to improve image quality. Density transformation corresponds to linear gamma correction, and cannot correct any color fog and the like of a photo image. Hence, lightness/color difference information of halftone image data is acquired on the basis of low-frequency components of frequency data obtained by transforming halftone image data into spatial frequency components, and a lightness/color difference transform amount of the halftone image data is set on the basis of the acquired lightness/color difference information.
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