Method and apparatus for quantizing a color image through a...

Details Method and apparatus for quantizing a color image through a... Method and apparatus for quantizing a color image through a...

2005-03-01

2005-03-01

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S518000, C358S530000, C358S534000, C358S003190, C345S597000, C345S604000

Reexamination Certificate

active

06862111

ABSTRACT:
This invention relates to a color image dithering method and apparatus for producing an output point in an output color space corresponding to a selected vertex in a tetrahedron of a three-dimensional cubic subinterval of a pixel point in a source color space. The device includes a truncating logic for truncating a value of a pixel having a point in a color space of the source image, for locating a three-dimensional cubic subinterval containing the point; a random number generator for generating a random number as a threshold value for dithering each pixel value of the source image; a first comparator for locating a tetrahedron having four vertices in the three-dimensional cubic subinterval that contains the pixel point; a second logic for assigning a probability density corresponding to each of the vertex; a second comparator for selecting a vertex provided by the threshold value through an inverse probability distribution function derived from the probability densities of said vertices; and a third logic for locating an output point in an output color space corresponding to the selected vertex.

REFERENCES:
patent: 5377041 (1994-12-01), Spaulding et al.
patent: 5497180 (1996-03-01), Kawakami et al.
patent: 5959631 (1999-09-01), Knittel

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