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| Research article summary (published 30 Dec 2002): |
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Surface color perception under two illuminants: the second illuminant reduces color constancy.
Full Abstract
This study investigates color perception in a scene with two different illuminants. The two illuminants, in opposite corners, simultaneously shine on a (simulated) scene with an opaque dividing wall, which controls how much of the scene is illuminated by each source. In the first experiment, the height of the dividing wall was varied. This changed the amount of each illuminant reaching objects on the opposite side of the wall. Results showed that the degree of color constancy decreased when a region on one side of the wall had cues to both illuminants, suggesting that cues from the second illuminant are detrimental to color constancy. In a later experiment, color constancy was found to improve when the specular highlight cues from the second illuminant were altered to be consistent with the first illuminant. This corroborates the influence of specular highlights in surface color perception, and suggests that the reduced color constancy in the first experiment is due to the inconsistent, though physically correct, cues from the two illuminants.
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Author information
Author/s: Yang, Joong Nam (JN); Shevell, Steven K (SK);
Affiliation: Department of Psychology, University of Chicago, Chicago, IL, USA. joongnam@eos.arc.nasa.gov
Grants: EY-04802 (Agency:United States NEI)
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Journal of vision (J Vis), published in United States. (Language: eng)
Reference: 2003-; vol 3 (issue 5) : pp 369-79
Dates: Created 2003/07/23; Completed 2003/10/06; Revised 2008/04/29;
PMID: 12875633, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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