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Coding of reflectance spectra using cross-illumination color prediction

The color appearance of an object depends on its reflectance spectrum and on the spectral characteristic of the illumination. In order to offer correct color under different illuminations at the reproduction stage it is necessary to transmit information about the whole reflectance spectrum. Knowing the tristimulus color values for a set of illuminations it is possible to calculate a reflectance spectrum that leads to the desired colors for these illuminations and linear combinations of them. The relatively small changes in color with changing illumination allow the use of a DPCM coding scheme. The performance is improved by predicting the color appearance of the object from one illumination to another. To achieve this we employ the white adaptation mechanism of the human eye and extend this by statistical modeling of the underlying reflectance spectra. We evaluate our approach using a set of reflectance spectra as well as a multispectral image.