Patent ID: 7555396

Claim:
A method for personalizing a reference database in a multiple LED spectrophotometer system comprising: generating a set of reflectance reference measurements from a test target on to a reference sensor; computing a spectral reconstruction reference matrix based on the operational characterization of the reference sensor from the set of reflectance reference measurements; generating a set of reflectance measurements from a test target on to a subject sensor, wherein the set of reflectance measurements of the subject sensor has fewer elements than the set of reflectance reference measurements of the reference sensor; computing a spectral reconstruction matrix based on the operational characterization of the subject sensor from the set of reflectance measurements, and adjusting the spectral reconstruction matrix by relating the set of reflectance measurements by the subject sensor to a set of corresponding reflectance reference measurements by the reference sensor, whereby the adjusting the spectral reconstruction matrix comprises computing a weighted least square minimization to generate an optimal solution spectral reconstruction matrix for the subject sensor; generating the personalized reference database from the solution spectral reconstruction matrix; and computing a personalized spectral reconstruction matrix for characterizing operation of the subject sensor by adjusting the spectral reconstruction reference matrix in accordance with the optimal solution spectral reconstruction matrix.