Patent US5638117A successfully refreshed from Google Patents.
US5638117A
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US
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Interactive method and system for color characterization and calibration of display device
Assignee: Verisign Inc
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Filing: 1994-11-14
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Granted: 1997-06-10
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Expires: 2014-11-14
Abstract
Abstract A system and method of characterizing the colors displayed on a display device and calibrating the display device is disclosed. A series of images are displayed to the user, and the user selects portions of the image that match other portions, that match characteristics of a matching card juxtaposed to the display device or that meet other criteria.
Inventors
- 👤 Peter Engeldrum
- 👤 William Hilliard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:59
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/02; H04N17/04; Y; Y10; Y10S; Y10S345/00; Y10S345/904
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
99 words
A system for determining color rendition in an imaging device, comprising: a brightness reference providing a first black reference area and a first white reference area; a gamma reference providing a halftone reference area and a continuous tone reference area; a black point reference providing a second black reference area and a color intensity reference area; a contrast reference providing a gray reference area; a white point correlated color temperature reference providing a second white reference area; and a matching card having known visual characteristics under a prescribed light source for comparing with a selected subset of the references.
Claim 2
Independent Claim
99 words
A system for determining color rendition in an imaging device, comprising: a brightness reference providing a first black reference area and a first white reference area; a gamma reference providing a halftone reference area and a continuous tone reference area; a black point reference providing a second black reference area and a color intensity reference area; a contrast reference providing a gray reference area; a white point correlated color temperature reference providing a second white reference area; and a matching card having known visual characteristics under a prescribed light source for comparing with a selected subset of the references.
Claim 3
Dependent Claim
168 words
A system as in claim 1, wherein the imaging device is a video display device, the brightness reference is a first image produced by said video display device, the gamma reference is a second image produced by said video display device, the continuous tone reference area includes a plurality of continuous tone subregions of varying intensity, the black point reference is a third image produced by said video display device, the color intensity reference area includes a plurality of color subregions of varying intensity, the contrast reference is a fourth image produced by said video display device, the white point correlated color temperature reference is a fifth image produced by said video display device, the white reference area includes a plurality of subregions each corresponding to a different correlated color temperature, and the matching card includes a cutout area, the matching card further being disposed for placement over a selected subset of said images to allow simultaneous viewing of one of said selected subset and the matching card.
Claim 4
Independent Claim
140 words
A method of determining color rendition in an imaging device, comprising: using the imaging device to provide a brightness reference having a first black reference area and a first white reference area; using the imaging device to provide a gamma reference having a halftone reference area and a continuous tone reference area, and making a comparison therebetween; using the imaging device to provide a black point reference having a second black reference area and a color intensity reference area, and making a comparison therebetween; using the imaging device to provide a contrast reference having a gray reference area; using the imaging device to provide a white point correlated color temperature reference having a second white reference area; and making a comparison between a subset of said references and a matching card having known visual characteristics under a prescribed light source.
Claim 5
Independent Claim
140 words
A method of determining color rendition in an imaging device, comprising: using the imaging device to provide a brightness reference having a first black reference area and a first white reference area; using the imaging device to provide a gamma reference having a halftone reference area and a continuous tone reference area, and making a comparison therebetween; using the imaging device to provide a black point reference having a second black reference area and a color intensity reference area, and making a comparison therebetween; using the imaging device to provide a contrast reference having a gray reference area; using the imaging device to provide a white point correlated color temperature reference having a second white reference area; and making a comparison between a subset of said references and a matching card having known visual characteristics under a prescribed light source.
Claim 6
Dependent Claim
21 words
A method as in claim 3, further comprising adjusting characteristics of said imaging device responsive to the results of said comparisons.
Claim 7
Dependent Claim
52 words
A method as in claim 3, wherein the visual characteristics of the matching card are known for each of a plurality of ambient lighting conditions, and wherein visual characteristics of the white point correlated color temperature reference are adjusted in response to a prevailing one of said plurality of ambient lighting conditions.
Claim 8
Dependent Claim
36 words
A method as in claim 5, further comprising selecting a known white point correlated color temperature for said imaging device in response to results from said comparison of said subset of references with said matching card.
Claim 9
Dependent Claim
33 words
A method as in claim 3, further comprising adjusting said imaging device to provide a known correlated color temperature in response to said comparison of said subset of references with said matching card.
Claim 10
Dependent Claim
52 words
A system as in claim 1, wherein the visual characteristics of the matching card are known for each of a plurality of ambient lighting conditions, and wherein visual characteristics of the white point correlated color temperature reference are adjusted in response to a prevailing one of said plurality of ambient lighting conditions.
Claim 11
Dependent Claim
34 words
A system as in claim 8, further comprising determining an known white point correlated color temperature for said imaging device in response to said comparison of said subset of references with said matching card.
Claim 12
Dependent Claim
33 words
A system as in claim 1, further comprising adjusting said imaging device to provide a known correlated color temperature in response to said comparison of said subset of references with said matching card.
Claim 13
Independent Claim
57 words
A system for determining color rendition in an imaging device, comprising: a reference area; and a matching card having known visual characteristics at each of a plurality of ambient lighting conditions, for comparing with the reference area to determine imaging parameter values of the imaging device under a prevailing one of the plurality of ambient lighting conditions.
Claim 14
Independent Claim
57 words
A system for determining color rendition in an imaging device, comprising: a reference area; and a matching card having known visual characteristics at each of a plurality of ambient lighting conditions, for comparing with the reference area to determine imaging parameter values of the imaging device under a prevailing one of the plurality of ambient lighting conditions.
Claim 15
Independent Claim
63 words
A method of determining color rendition in an imaging device, comprising: using the imaging device to provide a visual reference area; providing a matching card having known visual characteristics under each of a plurality of ambient lighting conditions; making a comparison between said visual reference area and said matching card; and determining color rendition in the imaging device in response to said comparison.
Claim 16
Independent Claim
63 words
A method of determining color rendition in an imaging device, comprising: using the imaging device to provide a visual reference area; providing a matching card having known visual characteristics under each of a plurality of ambient lighting conditions; making a comparison between said visual reference area and said matching card; and determining color rendition in the imaging device in response to said comparison.
Claim 17
Dependent Claim
33 words
A method as in claim 12, further comprising adjusting said imaging device in response to said determining, in order to obtain from the imaging device a set of known and desired visual characteristics.
Claim 18
Dependent Claim
52 words
A system as in claim 1, wherein the contrast reference is gamma adjusted, the white point correlated color temperature reference is gamma adjusted to provide the second white reference area with known perceived color characteristics, and the matching card has a known white point correlated color temperature under the prescribed light source.
Claim 19
Dependent Claim
57 words
A method as in claim 3, wherein the gray reference area is adjusted to known perceived color characteristics, the white point correlated color temperature reference is gamma adjusted to provide the second white reference area with known perceived color characteristics, and the matching card has a known white point correlated color temperature under the prescribed light source.
Claim 20
Dependent Claim
20 words
A system as in claim 11, wherein the reference area is gamma adjusted to be of known perceived color characteristics.
Claim 21
Dependent Claim
21 words
A method as in claim 12, wherein the visual reference area is gamma adjusted to be of known perceived color characteristics.
Claim 22
Dependent Claim
34 words
A method as in claim 12, further comprising adjusting said imaging device in response to said determining, in order to obtain from the imaging device subsequent color output that matches an expected color definition.
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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) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |