Method for automatic scene balance of digital images
First Claim
1. A scene balance correction method for a digital imaging device, comprising:
- a) determining a low-resolution image from an input image in an input color space;
b) applying a color transformation to convert the low-resolution image to a standard color space to form a standard color space low-resolution image, wherein the standard color space has a defined set of additive RGB primaries having a matrix relationship to CIE XYZ tristimulus values and that are selected so as not to cause any substantial color gamut limitations on the standard color space low-resolution image;
c) analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors;
d) determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and
e) applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image.
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Abstract
A scene balance correction method for a digital imaging device, including the steps of determining a low-resolution image from an input image in an input color space; applying a color transformation to convert the low-resolution image to a standard color space to form a standard color space low-resolution image; analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors; determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image.
139 Citations
22 Claims
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1. A scene balance correction method for a digital imaging device, comprising:
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a) determining a low-resolution image from an input image in an input color space;
b) applying a color transformation to convert the low-resolution image to a standard color space to form a standard color space low-resolution image, wherein the standard color space has a defined set of additive RGB primaries having a matrix relationship to CIE XYZ tristimulus values and that are selected so as not to cause any substantial color gamut limitations on the standard color space low-resolution image;
c) analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors;
d) determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and
e) applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A scene balance correction method for a digital imaging device, comprising:
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a) determining a low-resolution image from an input image in an input color space;
b) applying a color transformation to convert the low-resolution image to a standard color space to form a standard color space low-resolution image, wherein the standard color space has a defined set of RGB primaries that are selected so as not to cause any substantial color gamut limitations on the standard color space low-resolution image;
c) analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors;
d) determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and
e) applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image, where the defined set of RGB primaries have CIE chromaticity values of x=0.8730, y=0.1440 for red, x=0.1750, y=0.9270 for green, and x=0.0850, y=0.0001 for blue.
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18. A scene balance correction method for a digital imaging device, comprising the steps of:
a) determining a low-resolution image from an input image in an input color space having a luminance channel and two color difference channels wherein the luminance channel and 2 color difference channels are computed from logarithms of color values in an RGB color space having a defined set of RGB primaries and the luminance and 2 color difference channels are computed using the following equations - View Dependent Claims (19, 20)
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21. A computer program product comprising a computer readable storage medium having a computer program stored thereon for performing the steps of:
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a) determining a low-resolution image from an input image in an input color space;
b) applying a color transformation to convert the low-resolution image to a standard color space to form a standard color space low-resolution image, wherein the standard color space has a defined set of additive RGB primaries having a matrix relationship to CIE XYZ tristimulus values and that are selected so as not to cause any substantial color gamut limitations on the standard color space low-resolution image;
c) analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors;
d) determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and
e) applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image.
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22. A scene balance correction method for a digital imaging device, comprising:
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a) producing a low-resolution image from an input image in an input color space where the low resolution image has a lower resolution that the input image;
b) applying a color transformation to convert the low-resolution image to a standard additive color space to form a standard additive color space low-resolution image, the standard additive color space having additive primaries with no channel crosstalk;
c) analyzing the standard color space low-resolution image to determine a set of standard color space scene balance correction factors;
d) determining a set of corresponding input color space scene balance correction factors from the standard color space scene balance correction factors using the color transformation; and
e) applying the corresponding input color space scene balance correction factors to the input image to form a corrected input image.
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Specification