Patent ID: 8340937

Claim:
A method for characterizing a subject reflectance sensing device without measuring a full set of characterization color patch training samples used in manufacturing and characterizing individual sensors of multi-illuminator spectrophotometric reflectance sensing systems, the method comprising: measuring, for each illuminator of a fleet master reflectance sensing device, a respective wavelength; measuring, for each illuminator of the subject reflectance sensing device, a respective wavelength, said subject reflectance sensing device having a same number of corresponding illuminators as said fleet master reflectance sensing device; and for each of a subset of the full set of color training samples: receiving a reference spectral reflectance curve for each sample; and for each illuminator of said subject reflectance sensing device: using said reference spectral reflectance curve to obtain a first reflectance value corresponding to a wavelength measured for each illuminator of said subject reflectance sensing device, and to obtain a second reflectance value corresponding to a wavelength measured for a corresponding illuminator of said fleet master reflectance sensing device; calculating a difference in wavelength between said obtained first and second reflectance values at wavelength value λ; and storing said calculated difference for the current illuminator for this color training sample to a storage device.