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US5689350A
Expired / Lapsed
US
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Color printer calibration method for accurately rendering selected colors
Assignee: Xerox Corp
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Filing: 1994-12-12
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Granted: 1997-11-18
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Expires: 2014-12-12
Abstract
Abstract A color printer calibration method for improving printer accuracy for particular colors provides a look up table with a plurality of nodes useful as table indices. In such a table, nodes are provided specifically indexing selected colors, so that such colors are obtainable without interpolation. The planes in which the selected colors are found replace the nearest standard planes, so the spacing of the table through the space is approximately retained.
Inventors
- 👤 Robert J. Rolleston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:14
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033; H04N1/6016; H04N1/6019
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
A color printer calibration method for improving printer accuracy for specific colors includes the steps of: a) empirically deriving a set of mappings, each mapping indicating a conversion from a printer color space color to colorimetric color space color; b) identifying a first set of colors in colorimetric color space, for which mappings without interpolation from colorimetric space to device independent space are desired; c) identifying a second set of colors in colorimetric color space, dispersed through said space in accordance with a predetermined spacing function; d) identifying from said first and second sets, colors which are near each other in color space, and replacing identified second set colors with corresponding identified first set colors, to generate a new final set of colors; e) deriving from said empirically derived set of mappings an inverted set of mappings required for printer calibration at each of the colors in said final set of colors.
Claim 2
Dependent Claim
152 words
A color printer calibration method for improving printer accuracy for specific colors includes the steps of: a) empirically deriving a set of mappings, each mapping indicating a conversion from a printer color space color to colorimetric color space color; b) identifying a first set of colors in colorimetric color space, for which mappings without interpolation from colorimetric space to device independent space are desired; c) identifying a second set of colors in colorimetric color space, dispersed through said space in accordance with a predetermined spacing function; d) identifying from said first and second sets, colors which are near each other in color space, and replacing identified second set colors with corresponding identified first set colors, to generate a new final set of colors; e) deriving from said empirically derived set of mappings an inverted set of mappings required for printer calibration at each of the colors in said final set of colors.
Claim 3
Dependent Claim
18 words
The calibration method as described in claim 1, wherein said first set colors comprises fully saturated primary colors.
Claim 4
Dependent Claim
18 words
The calibration method as described in claim 1, wherein said first set colors comprises fully saturated secondary colors.
Claim 5
Dependent Claim
35 words
The calibration method as described in claim 1 and additionally identifying and adding to the final set of colors sufficient additional colors to provide a filled, rectangular array of colors in device colorimetric color space.
Claim 6
Dependent Claim
11 words
A printer, calibrated in accordance with the method of claim 1.
Claim 7
Dependent Claim
61 words
The method as defined in claim 1, wherein the addition of said first set of colors to said second set of colors creates a final set of colors which maintains a regular array of colors, with a set of nodes on each of any axes forming said regular array, each said set of nodes different than each of the other sets.
Claim 8
Dependent Claim
156 words
A color printer calibration method for improving printer accuracy for specific colors includes the steps of: a) empirically deriving a set of mappings, each mapping indicating a conversion from a printer color space color to colorimetric color space color; b) identifying a first set of colors in colorimetric color space, for which mappings without interpolation from colorimetric space to device independent space are desired; c) identifying a second set of colors in colorimetric color space, dispersed through said space in accordance with a predetermined spacing function; d) to said set of empirically derived mappings, adding members of said first set of colors, or replacing members of said second set of colors with members of said first set of colors, to generate a new final set of colors; e) deriving from said empirically derived set of mappings an inverted set of mappings required for printer calibration at each of the colors in said final set of colors.
Claim 9
Dependent Claim
156 words
A color printer calibration method for improving printer accuracy for specific colors includes the steps of: a) empirically deriving a set of mappings, each mapping indicating a conversion from a printer color space color to colorimetric color space color; b) identifying a first set of colors in colorimetric color space, for which mappings without interpolation from colorimetric space to device independent space are desired; c) identifying a second set of colors in colorimetric color space, dispersed through said space in accordance with a predetermined spacing function; d) to said set of empirically derived mappings, adding members of said first set of colors, or replacing members of said second set of colors with members of said first set of colors, to generate a new final set of colors; e) deriving from said empirically derived set of mappings an inverted set of mappings required for printer calibration at each of the colors in said final set of colors.
Claim 10
Dependent Claim
18 words
The calibration method as described in claim 7, wherein said first set colors comprises fully saturated primary colors.
Claim 11
Dependent Claim
18 words
The calibration method as described in claim 7, wherein said first set colors comprises fully saturated secondary colors.
Claim 12
Dependent Claim
35 words
The calibration method as described in claim 7 and additionally identifying and adding to the final set of colors sufficient additional colors to provide a filled, rectangular array of colors in device colorimetric color space.
Claim 13
Dependent Claim
11 words
A printer, calibrated in accordance with the method of claim 7.
Claim 14
Dependent Claim
61 words
The method as defined in claim 6, wherein the addition of said first set of colors to said second set of colors creates a final set of colors which maintains a regular array of colors, with a set of nodes on each of any axes forming said regular array, each said set of nodes different than each of the other sets.
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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) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |