Characterizing color input devices with well-behaved extrapolation
First Claim
1. A method for generating a color characterization model for a color input device, the color characterization model for performing transformation from a device-dependent color space of the color input device to a device-independent color space, the method comprising the steps of:
- accessing a first set of color measurement data corresponding to actual measurements of a color target by the color input device, wherein the color target has known color values in the device-independent color space and the actual measurements are obtained by the color input device in the device-dependent color space, wherein the actual measurements define a measurement range in the device-dependent color space, and wherein the measurement data includes data point pairs, each data point pair having corresponding actual measurements and known color values;
generating a second set of data point pairs based on plural device-dependent values outside the measurement range, by extrapolating device-independent values corresponding to the device-dependent values outside the measurement range from the first set of color measurement data; and
determining the color characterization model based on both the first set of color measurement data and the generated second set of data point pairs.
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Abstract
The present invention generates a color characterization model for performing transformation from a device-dependent color space of a color device to a device-independent color space. A first set of color measurement data is accessed corresponding to actual measurements of the color device, wherein the actual measurements define a measurement range in the device-dependent color space, and wherein the measurement data includes data point pairs, each data point pair having corresponding device-dependent values and device-independent values. Next, a second set of data point pairs is generated based on a predesignated set of device-dependent values outside the measurement range, by extrapolating device-independent values from the first set of color measurement data. The color characterization model is then determined based on both the first set of color measurement data and the generated second set of data point pairs. Because the color characterization model is determined based on actual measurements and extrapolated values, the color characterization model is well-behaved and does not exhibit significant overshooting or undershooting beyond the measurement range.
20 Citations
18 Claims
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1. A method for generating a color characterization model for a color input device, the color characterization model for performing transformation from a device-dependent color space of the color input device to a device-independent color space, the method comprising the steps of:
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accessing a first set of color measurement data corresponding to actual measurements of a color target by the color input device, wherein the color target has known color values in the device-independent color space and the actual measurements are obtained by the color input device in the device-dependent color space, wherein the actual measurements define a measurement range in the device-dependent color space, and wherein the measurement data includes data point pairs, each data point pair having corresponding actual measurements and known color values; generating a second set of data point pairs based on plural device-dependent values outside the measurement range, by extrapolating device-independent values corresponding to the device-dependent values outside the measurement range from the first set of color measurement data; and determining the color characterization model based on both the first set of color measurement data and the generated second set of data point pairs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for generating a color characterization model for a color input device, the color characterization model for performing transformation from a device-dependent color space of the color input device to a device-independent color space, the apparatus comprising:
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obtaining unit configured to obtaining a first set of color measurement data corresponding to actual measurements of a color target by the color input device, wherein the color target has known color values in the device-independent color space and the actual measurements are obtained by the color input device in the device-dependent color space, wherein the actual measurements define a measurement range in the device-dependent color space, and wherein the measurement data includes data point pairs, each data point pair having corresponding actual measurements and known color values; generating unit configured to generate a second set of data point pairs based on plural device-dependent values outside the measurement range, by extrapolating device-independent values corresponding to the device-dependent values outside the measurement range from the first set of color measurement data; and determining unit configured to determine the color characterization model based on both the first set of color measurement data and the generated second set of data point pairs.
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Specification