Color calibration method for imaging color measurement device
First Claim
1. A color calibration method for an imaging color measurement device, comprising:
- selecting an array of detectors of optical radiation;
selecting a plurality of optical elements designed to modify spectral power distribution of light incident on the array of detectors, such that a plurality of instances of irradiance of the array of detectors in a single measurement is resulted;
obtaining an error correction matrix for the imaging color measurement device for each instance of irradiance of the array of detectors in a single color measurement;
measuring a light source with known spectral output or chromaticity coordinates to obtain an irradiance response matrix of the imaging color measurement device for each instance of irradiation of the array of the detectors in a single color measurement;
applying the error correction matrix to the irradiance response matrix obtained by measuring the light source, so as to obtain a corrected irradiance response matrix for each instance of irradiation of the array of detectors in a single color measurement; and
calculating a color correction coefficient according to the known spectral output or chromaticity coordinate of the light source and the corrected response for each instance of irradiation of the array of detectors in a single color measurement.
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Abstract
A color calibration method for an imaging color measurement device utilizes a detector array, a plurality of optical elements, and multiple instances of irradiation of the detector array for a single measurement. A flat-fielding correction error correction matrix of the imaging color measurement device for each instance of irradiation of the detector array is obtained prior to color calibration. The response for each instance of irradiation of the detector array is flat-fielded with the corresponding error matrix to obtain a flat-fielded, spectrally weighted irradiance response for each instance of irradiation of the detector array. An illuminant light source with known spectral output or chromaticity coordinates is measured to obtain an irradiance response of the imaging color measurement device for each instance of irradiation of the detector array. A color correction coefficient is calculated using the known spectral output and chromaticity coordinates of the light source and the corresponding flat-fielded irradiance response.
29 Citations
15 Claims
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1. A color calibration method for an imaging color measurement device, comprising:
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selecting an array of detectors of optical radiation;
selecting a plurality of optical elements designed to modify spectral power distribution of light incident on the array of detectors, such that a plurality of instances of irradiance of the array of detectors in a single measurement is resulted;
obtaining an error correction matrix for the imaging color measurement device for each instance of irradiance of the array of detectors in a single color measurement;
measuring a light source with known spectral output or chromaticity coordinates to obtain an irradiance response matrix of the imaging color measurement device for each instance of irradiation of the array of the detectors in a single color measurement;
applying the error correction matrix to the irradiance response matrix obtained by measuring the light source, so as to obtain a corrected irradiance response matrix for each instance of irradiation of the array of detectors in a single color measurement; and
calculating a color correction coefficient according to the known spectral output or chromaticity coordinate of the light source and the corrected response for each instance of irradiation of the array of detectors in a single color measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A color calibration method, comprising performing a flat-fielding step and utilizing a flat-fielding correction matrix obtained from the flat-fielding step to correct an irradiation response matrix or matrices measured during color calibration.
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11. A color calibration method, comprising:
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providing an imaging color measurement device able to measure a plurality of light emitting areas at once;
flat fielding the imaging color measurement device;
color calibrating the imaging color measurement device, further comprising the following steps;
measuring an illuminant light source with known spectral response or chromaticity coordinates to obtain a flat-fielded irradiance response and an average flat-fielded irradiance response;
calculating one or more color correction coefficients for the imaging color measurement device according to the known chromaticity coordinates of the illuminant light source, the flat-fielded irradiance response, and the average flat-fielded irradiance response; and
obtaining trismulus values of the imaging color measurement device by multiplying the flat-fielded irradiance response with the color correction coefficient. - View Dependent Claims (12, 13, 14, 15)
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Specification