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Summary: How do Humans Determine Reflectance Properties under Unknown
Illumination?
Roland W. Fleming, Ron O. Dror, and Edward H. Adelson
Massachusetts Institute of Technology
roland@psyche.mit.edu, rondror@ai.mit.edu, adelson@psyche.mit.edu
Published in: Proceedings of the IEEE Workshop on Identifying Objects Across Variations in
Lighting: Psychophysics & Computation. Colocated with CVPR 2001.
Kauai, Hawaii, December 2001. c IEEE Computer Society.
Abstract
Under normal viewing conditions, humans find it easy
to distinguish between objects made out of different mate-
rials such as plastic, metal, or paper. Untextured materi-
als such as these have different surface reflectance prop-
erties, including lightness and gloss. With single isolated
images and unknown illumination conditions, the task of
estimating surface reflectance is highly underconstrained,
because many combinations of reflection and illumination
are consistent with a given image. In order to work out
how humans estimate surface reflectance properties, we
asked subjects to match the appearance of isolated spheres
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