We propose here a novel approach to acquire a multispectral image and at the same time estimate the illuminant with the use of a stereo camera. Two images of a scene: one normal RGB and one filtered image with an appropriate optical filter selected from among readily available filters placed in front of a lens of the stereo camera are acquired. The spectral reflectance and/or color at each pixel on the scene are estimated from the corresponding outputs in the two images. In the mean time, the illuminant used during the image capture is estimated using chromagenic illuminant estimation method. Experiments with the simulated data show that this is a promising technique for simultaneous multispectral imaging and the illuminant estimation. Today's increasing commercial availability of digital stereo cameras makes the proposed solution a viable one for many applications.
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