Method and apparatus for converting number of colors and...

Details Method and apparatus for converting number of colors and... Method and apparatus for converting number of colors and...

2005-05-10

2005-05-10

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060, C358S534000

Reexamination Certificate

active

06891641

ABSTRACT:
A method and an apparatus are provided in which a color of an input image can be reproduced with high accuracy by a small number of colors, and an image quality except the color reproducibility can be optimized. A color of each pixel of the input image is converted into one color selected from a plurality of reproducible colors, and an error due to the conversion is diffused into pixels surrounding the target pixel. In this conversion of the number of colors, a plurality of rules to be selected for a plurality of reproducible colors is prepared. One of the plural rules is selected to be applied for the whole or each part of the input image.

REFERENCES:
patent: 5402245 (1995-03-01), Motta et al.
patent: 5621546 (1997-04-01), Klassen et al.
patent: 5757517 (1998-05-01), Couwenhoven et al.
patent: 9-307776 (1997-11-01), None
patent: 10-93830 (1998-04-01), None

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