We investigate the physical validity of typical computational color constancy models for illuminant estimation of uncalibrated multispectral images. We demonstrate empirically that the assumptions may be reasonable and that we retrieve reasonably well the illumination for some images. On these images, we also have access to a good estimate of the spectral properties of the illumination while increasing the number of bands. However, some other images do not provide a very good illuminant estimation. We also show that the result depends mostly on the scene, rather than on the hypothesis made or on the number of spectral bands. Besides, the influence of the algorithm and its hypothesis is more critical for more bands than for the 3??????????????? color case.
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