Joint effects of illumination geometry and object shape in the perception of surface reflectance

Maria Olkkonen

Department of Psychology, University of Pennsylvania, 3401 Walnut St, Philadelphia, PA 19104, USA

maria.olkkonen@rutgers.edu

David H Brainard

Department of Psychology, University of Pennsylvania, 3401 Walnut St, Philadelphia, PA 19104, USA

brainard@psych.upenn.edu

 
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Abstract. Surface properties provide useful information for identifying objects and interacting with them. Effective utilization of this information, however, requires that the perception of object surface properties be relatively constant across changes in illumination and changes in object shape. Such constancy has been studied separately for changes in these factors. Here we ask whether the separate study of the illumination and shape effects is sufficient, by testing whether joint effects of illumination and shape changes can be predicted from the individual effects in a straightforward manner. We found large interactions between illumination and object shape in their effects on perceived glossiness. In addition, analysis of luminance histogram statistics could not account for the interactions.


Cite as: Olkkonen M, Brainard D H, 2011, "Joint effects of illumination geometry and object shape in the perception of surface reflectance" i-Perception 2(9) 1014–1034
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DOI: 10.1068/i0480

ISSN: 2041-6695 (electronic only)

Copyright: Copyright is retained by the author(s) of this article. This open-access article is distributed under a Creative Commons Licence, which permits noncommercial use, distribution, and reproduction, provided the original author(s) and source are credited and no alterations are made.
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