US5740076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for describing a color gamut in a graphical data processing system
Assignee: PICTOGRAPHICS INTERNATIONAL Corp
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Filing: 1995-11-30
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Granted: 1998-04-14
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Expires: 2015-11-30
Abstract
Abstract An improved method is described for obtaining, processing and displaying information relating to the ability of a display system to render any candidate color. This method is comprised of a Gamut Signal Encoder which produces a signal that is separately processed by a Distance Encoder, a Distance Classifier and Color Encoder and a Gamut Test Encoder, thus providing three processed signals for assisting in the understanding of a display device's ability to render the color.
Inventors
- 👤 Bruce J. Lindbloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:59
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6058
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A system for characterizing a color gamut, comprising: a gamut signal encoder, receiving an input color signal and producing a gamut signal; a distance encoder, receiving the gamut signal and producing a distance signal; a distance classifier and color encoder, receiving the gamut signal and producing a color coded difference signal; and a gamut test encoder, receiving the gamut signal and producing an inside/outside signal.
Claim 2
Independent Claim
65 words
A system for characterizing a color gamut, comprising: a gamut signal encoder, receiving an input color signal and producing a gamut signal; a distance encoder, receiving the gamut signal and producing a distance signal; a distance classifier and color encoder, receiving the gamut signal and producing a color coded difference signal; and a gamut test encoder, receiving the gamut signal and producing an inside/outside signal.
Claim 3
Dependent Claim
21 words
The system of claim 1 wherein the gamut signal encoder comprises a three dimensional look up table for three dimensional interpolation.
Claim 4
Dependent Claim
18 words
The system of claim 2 wherein the three dimensional look up table contains samples from a continuous function.
Claim 5
Dependent Claim
52 words
The system of claim 2 wherein the gamut signal encoder converts the input color signal having a L* component, an a* component, and a b* component into an L* address, an a* address, and a b* address respectively which are converted into the gamut signal using the three dimensional look up table.
Claim 6
Dependent Claim
33 words
The system of claim 1 wherein the distance classifier and color encoder comprises at least two output stages corresponding to at least two distinct color regions designated by at least two output colors.
Claim 7
Dependent Claim
24 words
The system of claim 5 wherein the distance classifier and color encoder comprises a color picker for selecting the at least two output colors.
Claim 8
Dependent Claim
91 words
A user control for characterizing a color gamut, comprising: a gamut signal encoder, receiving an input color signal and producing a gamut signal; a distance classifier and color encoder, receiving the gamut signal and producing a color coded difference signal; a user interface receiving the color coded difference signal and providing a graphical depiction of deviation of the input color signal from the color gamut, the user interface producing at least two output colors overlaid on out-of-gamut colors to indicate relative departure of the color input signal from the color gamut.
Claim 9
Dependent Claim
91 words
A user control for characterizing a color gamut, comprising: a gamut signal encoder, receiving an input color signal and producing a gamut signal; a distance classifier and color encoder, receiving the gamut signal and producing a color coded difference signal; a user interface receiving the color coded difference signal and providing a graphical depiction of deviation of the input color signal from the color gamut, the user interface producing at least two output colors overlaid on out-of-gamut colors to indicate relative departure of the color input signal from the color gamut.
Claim 10
Dependent Claim
22 words
The user control of claim 7 wherein the gamut signal encoder comprises a three dimensional look up table for three dimensional interpolation.
Claim 11
Dependent Claim
19 words
The user control of claim 8 wherein the three dimensional look up table contains samples from a continuous function.
Claim 12
Dependent Claim
53 words
The user control of claim 8 wherein the gamut signal encoder converts the input color signal having a L* component, an a* component, and a b* component into an L* address, an a* address, and a b* address respectively which are converted into the gamut signal using the three dimensional look up table.
Claim 13
Dependent Claim
25 words
The user control of claim 8 wherein the distance classifier and color encoder comprises a color picker for selecting the at least two output colors.
Claim 14
Dependent Claim
34 words
The user control of claim 7 wherein the distance classifier and color encoder comprises at least two output stages corresponding to at least two distinct color regions designated by at least two output colors.
Claim 15
Dependent Claim
20 words
The user control of claim 11 wherein the at least two distinct color regions may be programmed by a user.
Claim 16
Independent Claim
74 words
A method for characterization of an input color signal according to a color gamut comprising the steps of: selecting the color gamut; converting the input color signal into a gamut signal using three dimensional color interpolation in a continuous function; generating a color coded difference signal by comparing the gamut signal to the color gamut; displaying at least two different output signals corresponding to the deviation of the gamut signal to the color gamut.
Claim 17
Independent Claim
74 words
A method for characterization of an input color signal according to a color gamut comprising the steps of: selecting the color gamut; converting the input color signal into a gamut signal using three dimensional color interpolation in a continuous function; generating a color coded difference signal by comparing the gamut signal to the color gamut; displaying at least two different output signals corresponding to the deviation of the gamut signal to the color gamut.
Claim 18
Dependent Claim
22 words
The method of claim 14 wherein deviation of the gamut signal is measured in ranges of ΔE units outside the device gamut.
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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) | 2001-04-13 | 2001-10-13 | 2002-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-13 | 2005-10-13 | 2006-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-13 | 2009-10-13 | 2010-04-14 | $7700.00 | Window Closed / Lapsed |