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Surface Reflectance Estimation and Natural Illumination Statistics

Author(s)
Dror, Ron O.; Adelson, Edward H.; Willsky, Alan S.
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Abstract
Humans recognize optical reflectance properties of surfaces such as metal, plastic, or paper from a single image without knowledge of illumination. We develop a machine vision system to perform similar recognition tasks automatically. Reflectance estimation under unknown, arbitrary illumination proves highly underconstrained due to the variety of potential illumination distributions and surface reflectance properties. We have found that the spatial structure of real-world illumination possesses some of the statistical regularities observed in the natural image statistics literature. A human or computer vision system may be able to exploit this prior information to determine the most likely surface reflectance given an observed image. We develop an algorithm for reflectance classification under unknown real-world illumination, which learns relationships between surface reflectance and certain features (statistics) computed from a single observed image. We also develop an automatic feature selection method.
Date issued
2001-09-01
URI
http://hdl.handle.net/1721.1/6656
Other identifiers
AIM-2001-023
Series/Report no.
AIM-2001-023
Keywords
AI, reflectance, lighting, BRDF, surface, illumination statistics, natural images

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