Method for automatic white balance of digital images
AssigneeEastman Kodak Company
InventorsJames E. Adams, Jr., John F. Hamilton, Jr., Edward B. Gindele, Bruce H. Pillman
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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.
Claims7
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=A1×Bv+A2×aveill+A3
- where Bv is the scene brightness, aveill is a color coordinate value, and A1, A2, and
- A3 are coefficient responsive to the scene illuminant type.
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=B1×Bv+B2×aveill+B3
- where B1, B2, and B3 are coefficients responsive to the scene illuminant type.
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=B1×Bv+B2×aveill+B3
- where B1, B2, and B3 are coefficients responsive to the scene illuminant type and wherein the white balance parameter value is defined by
- s=A1×Bv+A2×aveill+A3
- where Bv is the scene brightness, aveill is a color coordinate value, and A1, A2, and
- A3 are coefficient responsive to the scene illuminant type.
Dependencies are inferred from the claim text.