Illumination Estimation Using a Multilinear Constraint on Dichromatic Planes
Toro, J. and Funt, B., "Illumination Estimation Using a Multilinear Constraint on Dichromatic Planes,"
Proc. British Machine Vision Conference 2005 pp. 512-518, Oxford, Sept. 2005.
A new multilinear constraint on the color of the scene illuminant based on the
dichromatic reflection model is proposed. The formulation avoids the problem,
common to previous dichromatic methods, of having to first identify
pixels corresponding to the same surface material. Once pixels from two or
more materials have been identified, their corresponding dichromatic planes
can be intersected to yield the illuminant color. However, it is not always
easy to determine which pixels from an arbitrary region of an image belong
to which dichromatic plane. The image region may cover an area of the scene
encompassing several different materials and hence pixels from several different
dichromatic planes. The new multilinear constraint accounts for this
multiplicity of materials and provides a mechanism for choosing the most
plausible illuminant from a finite set of candidate illuminants. The performance
of this new method is tested on a database of real images.
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