US5153576A
Expired / Lapsed
US
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Mapping of color images to black-and-white textured images
Assignee: Xerox Corp
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Filing: 1990-08-29
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Granted: 1992-10-06
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Expires: 2010-08-29
Abstract
Abstract Mapping an image comprised of 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 being comprised of a plurality of cells. Certain cells areas of each screen having 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
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:21
CPC Classifications
G; G06; G06K; G06K15/00; H; H04; H04N; H04N1/00; H04N1/40; H04N1/40012; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A method of mapping an image comprised of 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 of each pixel to its own halftone screen, each halftone screen being comprised of 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 of each pixel to yield a black-and-white textured image representing at least two of hue, luminance and saturation of each color component in the color image.
Claim 2
Independent Claim
130 words
A method of mapping an image comprised of 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 of each pixel to its own halftone screen, each halftone screen being comprised of 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 of each pixel to yield a black-and-white textured image representing at least two of hue, luminance and saturation of each color component in the color image.
Claim 3
Dependent Claim
27 words
The method as recited in claim 1, wherein: said determining step includes determining the amounts of the red, green and blue color components in the color image.
Claim 4
Dependent Claim
24 words
The method as recited in claim 1, wherein: said allocating step includes allocating cell areas according to the luminance contribution of each color component.
Claim 5
Independent Claim
136 words
An apparatus for mapping an image comprised of 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 of each pixel to its own halftone screen, each halftone screen being comprised of a plurality of cells, certain cells 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 of each pixel to yield a black-and-white textured image representing at least two of hue, luminance and saturation of each color component in the color image.
Claim 6
Independent Claim
136 words
An apparatus for mapping an image comprised of 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 of each pixel to its own halftone screen, each halftone screen being comprised of a plurality of cells, certain cells 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 of each pixel to yield a black-and-white textured image representing at least two of hue, luminance and saturation of each color component in the color image.
Claim 7
Dependent Claim
26 words
The apparatus as recited in claim 4, wherein: said determining means determines the amounts of the red, green and blue color components in the color image.
Claim 8
Dependent Claim
23 words
The apparatus as recited in claim 4, wherein: the cell areas have been allocated according to the luminance contribution of each color component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |