Patent ID: 7859668

Claim:
A method, comprising: generating a first light beam comprising a plurality of first spatial regions, at least two of the first spatial regions being spectrally different; generating at least one second light beam and at least one third light beam using the first light beam, the at least one second light beam comprising a plurality of second spatial regions, each of the second spatial regions comprising a plurality of first wavelength bands, the at least one third light beam comprising a plurality of third spatial regions, at least two of the second spatial regions being spectrally different, at least two of the third spatial regions being spectrally different; measuring a spectrum in each of the plurality of first wavelength bands for each of the second spatial regions; illuminating at least part of an object with the at least one third light beam to produce at least one fourth light beam, the at least one fourth light beam comprising a plurality of fourth spatial regions, each of the fourth spatial regions comprising a plurality of second wavelength bands, at least two of the fourth spatial regions being spectrally different; measuring a spectrum in each of the plurality of second wavelength bands for each of the fourth spatial regions; and identifying a radiance transfer factor of the object using at least some of the measured spectra.