A limited number of voltage measurements are received from a multiple illuminant color sensor at the direction of a color sensor controller. The received sensor voltages are normalized in accordance with a calibration look-up table. Next, the normalized sensor voltages are converted to reflectance values...http://www.google.ca/patents/US6449045?utm_source=gb-gplus-sharePatent US6449045 - System and method from reconstruction of spectral curves using measurements for a color sensor and statistical techniques
