US6573932B1
Expired / Lapsed
US
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Method for automatic white balance of digital images
Assignee: Eastman Kodak Co
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Filing: 2002-03-15
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Granted: 2003-06-03
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Expires: 2022-03-15
Abstract
Abstract A white balance correction method for a digital imaging device, including determining a scene illuminant type from a scene brightness and one or more color coordinate values; determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; providing at least one white balance correction curve; determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type.
Inventors
- 👤 James E. Adams, Jr.
- 👤 John F. Hamilton, Jr.
- 👤 Edward B. Gindele
- 👤 Bruce H. Pillman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:31
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6083; H04N1/6086; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; and (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance parameter value is defined by s=A 1 ×B v +A 2 ×aveill+A 3 where B v is the scene brightness, aveill is a color coordinate value, and A 1 , A 2 , and A 3 are coefficient responsive to the scene illuminant type.
Claim 2
Dependent Claim
137 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; and (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance parameter value is defined by s=A 1 ×B v +A 2 ×aveill+A 3 where B v is the scene brightness, aveill is a color coordinate value, and A 1 , A 2 , and A 3 are coefficient responsive to the scene illuminant type.
Claim 3
Dependent Claim
14 words
The method of claim 1 where the digital imaging device is a digital camera.
Claim 4
Dependent Claim
16 words
The method of claim 1 where the scene illuminant types are daylight, flash, tungsten, and fluorescent.
Claim 5
Dependent Claim
28 words
A computer storage product having at least one computer storage medium having instructions stored therein causing one or more computers to perform the method of claim 1 .
Claim 6
Dependent Claim
122 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance correction curve is defined by c=B 1 ×B v +B 2 ×aveill+B 3 where B 1, B 2 , and B 3 are coefficients responsive to the scene illuminant type.
Claim 7
Dependent Claim
122 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance correction curve is defined by c=B 1 ×B v +B 2 ×aveill+B 3 where B 1, B 2 , and B 3 are coefficients responsive to the scene illuminant type.
Claim 8
Dependent Claim
172 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance correction curve is defined by c=B 1 ×B v +B 2 ×aveill+B 3 where B 1 , B 2 , and B 3 are coefficients responsive to the scene illuminant type and wherein the white balance parameter value is defined by s=A 1 ×B v +A 2 ×aveill+A 3 where B v is the scene brightness, aveill is a color coordinate value, and A 1 , A 2 , and A 3 are coefficient responsive to the scene illuminant type.
Claim 9
Dependent Claim
172 words
A white balance correction method for a digital imaging device, comprising: (a) determining a scene illuminant type from a scene brightness and one or more color coordinate values; (b) determining a white balance parameter value responsive to the scene illuminant type, the scene brightness, and one or more color coordinate values; (c) providing at least one white balance correction curve; (d) determining the white balance correction from the white balance parameter value and at least one white balance correction curve for the determined scene illuminant type; and (e) wherein the white balance correction curve is defined by c=B 1 ×B v +B 2 ×aveill+B 3 where B 1 , B 2 , and B 3 are coefficients responsive to the scene illuminant type and wherein the white balance parameter value is defined by s=A 1 ×B v +A 2 ×aveill+A 3 where B v is the scene brightness, aveill is a color coordinate value, and A 1 , A 2 , and A 3 are coefficient responsive to the scene illuminant type.
Claim 10
Dependent Claim
16 words
The method of claim 6 where the scene illuminant types are daylight, flash, tungsten, and fluorescent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-06-02 | 2006-12-02 | 2007-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-02 | 2010-12-02 | 2011-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-02 | 2014-12-02 | 2015-06-03 | $7700.00 | Window Closed / Lapsed |