Patent ID: 6058357
Filing Date: 2000-05-02
Classification: G01J

Abstract:
A method of correcting errors in light measurements in a color sensing device that provides spectral information regarding a light source, such errors arising from imperfections in the color sensing device, the method comprising:generating a plurality of spectral measurements, the number in the plurality being designated N, each spectral measurement representing an amount of light in a respective one of a plurality of N spectral bands;providing crosstalk information quantifying the degree to which the color sensing device is characterized by light in a particular spectral band contributing to measurements of light in other spectral bands;generating a correction value for each spectral band, the correction value based on the plurality of spectral measurements and on said crosstalk information; andcorrecting the spectral measurement for each spectral band by subtracting said correction value for that band;wherein the crosstalk information is in the form of a correction matrix having a first dimensionality N and a second dimensionally designated M; and said generating a correction value for each spectral band comprises:generating an M.times.1 vector representing the plurality of N spectral measurements where M is an integer no greater than N, andgenerating an N.times.1 vector that is the product of the correction matrix and the M.times.1 vector, wherein the N.times.1 vector has N elements, each of which is a respective correction value.