Facsimile and static presentation processing – Natural color facsimile – Color separation
Reexamination Certificate
2005-12-16
2010-06-22
Safaipour, Houshang (Department: 2625)
Facsimile and static presentation processing
Natural color facsimile
Color separation
C358S516000, C358S517000, C358S518000
Reexamination Certificate
active
07742205
ABSTRACT:
The invention relates to a color matching method for transforming a color representation of a first set of color primaries with a plurality of first signals to a second set of color primaries with a plurality of second signals in a first domain. The color matching method of the invention is to consider the characteristics of human visual perception. Since human is more sensitive to the luminous intensity than chrominance, the color matching method of the invention is considered to match the luminous intensity. The color matching method of the invention can minimize the intensity difference by utilizing the optimality of resource distribution. An additional step of smoothing the intensity difference among color primaries at the level of color primaries is appended. It enhances the visual quality especially for the images with a gradual change in numerous levels of color. Besides, when the color is outside the gamut, we keep the information of luminance by adding extra white. According to the invention, the color matching method of handling colors outside gamut can provide a higher contrast which is especially good for displaying a color change with numerous levels, such as sunrise or sunset scenes. The color matching method further considers color interactions of each color primary regarding the configuration of surrounding color primaries. With the consideration of exploiting the perceived luminous intensity instead of physical luminous intensity, a superior color matching algorithm can be made.
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Lor Wing Keung Felix
Phan Gia Chuong
Birch & Stewart Kolasch & Birch, LLP
Safaipour Houshang
VP Assets Limited Registered in British Virgin Islands
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