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US 10,768,098 B2Granted
Spectrum recovery in a sample
AssigneeDatacolor Inc.
InventorZhiling Xu
Life of this patent
Estimating the term…
Abstract
A method and a system are provided for obtaining improved spectra recovery results of a measurement of a sample through the use of a calibration matrix obtained from calibration measurement values using at least one illumination source. By calculating the reflectance spectrum of a collection of calibration samples across several rounds of measurements and cascading the results, an improved calibration matrix can be used to convert the sample measurement values to more accurate results.
Claims19
A color measurement system comprising:
- at least one illuminant configured to produce a light beam having one or more spectral power distributions (SPD) at a sample;
- a color measurement device configured to generate data in response to light from the at least one illuminant and reflected off the sample being incident on a light sensing portion of the color measurement device;
- and
- a processor having a memory and configured to receive the output signal from the color measurement device, and calculate a recovered reflectance spectrum of the sample using at least the output signal generated when the sample is illuminated by the at least one illuminant, wherein the recovered reflectance spectrum is calculated by generating a sample matrix using the data output from the color measurement device upon illumination of the sample, and obtaining the product of the sample matrix and a calibration value,
- wherein the calibration value is a matrix calculated using at least a matrix of concatenated calibration matrices and at least a matrix of concatenated master calibration matrices, wherein the concatenated calibration matrices includes a first calibration matrix of measurement values for a plurality of reference objects obtained under at least one measurement criterion and at least one additional calibration matrix of measurement values for the plurality of reference objects obtained under the same at least one measurement criterion.
2 more elements
A method for identifying the color properties of a sample, the method comprising:
- capturing, using a sample color sensing device, a sample measurement value of a sample illuminated by at least one illuminant;
- generating, using at least one processor having memory and configured to execute code, a recovered color value for the sample using at least the sample measurement value and a calibration value, wherein the calibration value is a matrix derived using at least a matrix of concatenated calibration matrices and a matrix of concatenated master calibration matrices, wherein each of the matrix of concatenated calibration matrices includes a first measurement matrix of measurements of a plurality of reference tiles under at least one illuminant and at least one additional measurement matrix of measurements of the plurality of reference tiles under the at least one illuminant used to obtain the first measurement matrix;
- and
- outputting at least the calculated color properties.
1 more element
Dependencies are inferred from the claim text.