Illuminant color from shading

Hsien-Che Lee

doi:10.1117/12.19715

1 August 1990 Illuminant color from shading

Hsien-Che Lee

Proceedings Volume 1250, Perceiving, Measuring, and Using Color; (1990) https://doi.org/10.1117/12.19715
Event: Electronic Imaging: Advanced Devices and Systems, 1990, Santa Clara, CA, United States

Abstract

The image of a uniform wall illuminated by a spotlight often gives a strong impression of the illuminant color. How can it be possible to know if it is a white wall illuminated by yellow light or a yellow wall illuminated by white light? If the wall is a Lambertian reflector, it would not be possible to tell the difference. However, in the real world, some amount of specular reflection is often present. An empirical reflection model describes light reflection from an inhomogeneous surface as a mixture of a specular (interface) component and a diffuse (body) component. Since the spatial scale over which the interface reflection changes significantly is much smaller than that of the body reflection, it can be shown that one can effectively exploit the scale difference to find a unique solution, which is often quite accurate. The method can also be generalized to compute the illuminant chromaticity for a nonuniform smooth surface.

Citation Download Citation

Hsien-Che Lee "Illuminant color from shading", Proc. SPIE 1250, Perceiving, Measuring, and Using Color, (1 August 1990); https://doi.org/10.1117/12.19715

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