System and method to standardize whiteness calibration and measurement
AssigneeDatacolor Inc.
InventorsZhiling Xu, Michael H. Brill
Life of this patent
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Abstract
By way of overview and introduction, various embodiments of the apparatus, systems and methods described herein are directed improved approaches to aligning and standardizing different total spectral radiance factor shapes measured with different instruments. Furthermore, in one or more configurations and approaches, the disclosure presented herein is directed to obtaining a whiteness calibration value for use in sample measurements without the need of UV filter adjustments.
Claims19
A method for providing a device independent total spectral radiance factor of a sample, the method comprising:
- obtaining, using a light measurement instrument, a first measurement of the sample under at least one illuminant that excludes UV spectral radiance;
- obtaining, using a light measurement instrument, a second measurement of the sample under at least one illuminant that provides a UV excited spectral radiance;
- obtaining a compensation value for the UV excited spectral radiance measurement;
- accessing a standard illumination profile from a pre-defined list of standard illuminant profiles;
- calculating, as an updated second measurement value, the quotient of the product of the compensation value and the second measurement value divided by the accessed standard illumination profile;
- determining the total spectral radiance factor value for the sample by using the first and updated second measurement value;
- and
- outputting the total spectral radiance factor value.
A system for providing a device independent total spectral radiance factor of a sample, the system comprising:
- at least two illumination sources, wherein a wavelength range of the first of the at least two illumination sources does not overlap with a wavelength range of a second illumination of the at least two illumination sources;
- a light measurement device configured to output a value in response to light incident thereupon;
- a processor configured to execute code stored on a memory thereof to:
- receive a first measurement of a sample under the first of the at least two illumination sources;
- receive a second measurement of the sample under the second of the at least two illumination sources;
- obtain a compensation value;
- access a standard illumination profile;
- calculate a total spectral radiance factor value for the sample by obtaining the sum of the first measurement and the quotient of the product of the compensation value and the second measurement value divided by the accessed illumination profile;
- and
- output the calculated total spectral radiance factor value.
A method for providing a device independent total spectral radiance factor of a sample, the method comprising:
- obtaining, using a light measurement instrument, a first measurement of the sample under at least one illuminant;
- applying a LTV bandpass filter to the at least one illuminant;
- obtaining, using a light measurement instrument, a second measurement of the sample using the illuminant configured with the UV bandpass filter;
- obtaining a compensation value for the UV excited spectral radiance measurement using the first measurement;
- accessing a standard illumination profile from a pre-defined list of standard illuminant profiles;
- calculating a total spectral radiance factor value for the sample by obtaining the sum of the first measurement and the quotient of the product of the compensation value and the second measurement value divided by the accessed standard illumination profile;
- and
- outputting the total spectral radiance factor value.
Dependencies are inferred from the claim text.