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US 6,587,793 B2Granted
Systems and methods for determining spectra using fuzzy inference algorithms with measurements from LED color sensor
AssigneeXerox Corporation
InventorsDaniel E. Viassolo, Lalit K. Mestha
Life of this patent
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Abstract
An LED-based spectrophotometer uses a reconstruction algorithm, based on spectral information of an illumination source and a reference spectrophotometer, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. A non-linear model, such as a fuzzy inference system (FIS), is used to reconstruct spectra.
Claims29
A method of determining a reflectance spectrum, comprising:
- obtaining a normalized value from a plurality of illuminant sensor outputs, each illuminant sensor output indicating a reflectance value obtained from a target;
- obtaining reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs for reference colors;
- and
- determining a spectrum Ŝ based on the illuminant sensor outputs and the reference data, wherein the determining step comprises generating a non-linear model.
1 more element
A spectral determination system, comprising:
- a plurality of illuminants;
- at least one photodetector that detects light originating from the plurality of illuminants and reflected by a target;
- and
- a controller that:
- normalizes a plurality of illuminant sensor outputs obtained from the at least one photodetector, each illuminant sensor output indicating a reflectance value obtained from a target;
- obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs for reference colors;
- and
- determines a spectrum Ŝ based on the illuminant sensor outputs and the reference data, wherein the determining step comprises generating a non-linear model.
5 more elements
A controller that:
- obtains a normalized value from a plurality of illuminant sensor outputs, each illuminant sensor output indicating a reflectance value obtained from a target;
- obtains reference data from a reference database that correlates reference spectra with a corresponding plurality of normalized illuminant sensor outputs for reference colors;
- and
- determines a spectrum Ŝ based on the illuminant sensor outputs and the reference data, wherein the determining step comprises generating a non-linear model.
1 more element
Dependencies are inferred from the claim text.