Patent ID: 6088095
Filing Date: 2000-07-11
Classification: H04N

Abstract:
A method of calibrating a scanner for an input sample of a selected medium without accessing a predetermined calibration target for the selected medium comprising steps of:predetermining the spectral response of the scanner comprising the relationship between the spectrum of inputs to the scanner and the scanner measurements generated in response to these inputs;measuring the selected medium in a spectrophotometer for acquiring a set of spectra representative of the spectral nature of the selected medium;determining the set of spectra that could result in a given set of scanner measurements using the spectral response of the scanner;estimating the spectrum of an input sample from its scanner measurements by computing a spectrum corresponding to the intersection of the set of producible spectra for the selected medium and the set of spectra that could result in the given scanner measurements; andconverting the estimated spectrum to a device-independent color space.