Image analysis – Color image processing – Color correction
Reexamination Certificate
2005-01-25
2005-01-25
Couso, Yon J. (Department: 2625)
Image analysis
Color image processing
Color correction
C358S518000
Reexamination Certificate
active
06847732
ABSTRACT:
Disadvantages of conventional image processing devices using a vector error diffusion method include the generation of periodic texture noise of specific selected colors, resulting in marked reduction of graininess. A noise overlay unit is provided as a front stage of an error adding unit for adding error to input image data. If noise is superimposed on the L*a*b* color space or L*C*h color space, quantitative image evaluation matching human perception is possible, and overlay noise can be effectively optimized. If the total sum of the absolute amount of overlay noise is zero, the color tone of the entire image can be maintained.
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Couso Yon J.
Minolta Co. , Ltd.
Morrison & Foerster / LLP
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