Patent EP0473433A2 successfully refreshed from Google Patents.
EP0473433A2
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Mapping of color images to black-and-white textured images
Assignee: Xerox Corp
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Filing: 1991-08-29
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Granted: —
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Expires: 2011-08-29
Abstract
Abstract Mapping an image comprising a plurality of pixels from color to black-and-white includes determining, on a pixel-by-pixel basis, the amount of a plurality of color components in a color image. Each color component is applied to its own halftone screen, each screen comprising of a plurality of cells. Certain cells areas of each screen have been allocated to a single color component to yield texture patterns. The halftone screens of the color components are combined to yield a black-and- white textured image.
Inventors
- 👤 Steven J. Harrington
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 10:01
CPC Classifications
G; G06; G06K; G06K15/00; H; H04; H04N; H04N1/00; H04N1/40; H04N1/40012; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A method of mapping an image comprising a plurality of pixels from color to black-and-white, the method comprising the steps of: on a pixel-by-pixel basis, determining the amount of each of a plurality of color components in a color image; applying each of the plurality of color components to its own halftone screen, each halftone screen comprising a plurality of cells; allocating certain cell areas of each halftone screen to a single color component to yield corresponding texture patterns, in accordance with the location of the allocated cell areas; and combining the halftone screens of the color components to yield a black-and-white textured image.
Claim 2
Dependent Claim
25 words
The method of claim 1, wherein: said determining step includes determining the amounts of the red, green and blue color components in the color image.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein: said allocating step includes allocating cell areas according to the luminance contribution of each color component.
Claim 4
Independent Claim
110 words
An apparatus for mapping an image comprising a plurality of pixels from color to black-and-white comprising: determining means for determining the amount of each of a plurality of color components in a color image on a pixel-by-pixel basis; applying means for applying each of the plurality of color components to its own halftone screen, each halftone screen comprising a plurality of cells, certain cell areas of each halftone screen having been allocated to a single color component to yield corresponding texture patterns in accordance with the location of the allocated cell areas; and combining means for combining the halftone screens of the color components to yield a black-and-white textured image.
Claim 5
Dependent Claim
24 words
The apparatus of claim 4, wherein: said determining means determires the amounts of the red, green and blue color components in the color image.
Claim 6
Dependent Claim
21 words
The apparatus of claim 4, wherein: the cell areas have been allocated according to the luminance contribution of each color component.
References Cited (Backward Citations)
No citation records indexed.
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