Document Detail

Cues and strategies for color constancy: perceptual scission, image junctions and transformational color matching.
MedLine Citation:
PMID:  11809474     Owner:  NLM     Status:  MEDLINE    
The identification of objects, illuminants, and transparencies are probably the most important perceptual functions of color. This paper examines the effects of perceptual scission, image junctions, color adaptation, and color correlations on identification. Simulations of natural illuminants, materials, and filters were used in a forced-choice procedure to simultaneously measure thresholds for identifying filters and objects across illuminants, and discrimination thresholds within illuminants. In the vast majority of the cases, if observers could discriminate within illuminants they could identify across illuminants. Since results were similar for identical color distributions, whether transparency cues like X-junctions were present or not, the primary cues for color identification were systematic color shifts across illuminants. These color shifts can be well described by three-parameter affine transformations, and the parameters can be derived from differences and ratios of mean chromaticities. A strategy based on post-transformation color matching predicts generally accurate identification despite perceptible color shifts, and also provides plausible reasons for those few conditions where identification thresholds are significantly higher than discrimination thresholds.
Byung-Geun Khang; Qasim Zaidi
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  42     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-01-25     Completed Date:  2002-04-08     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  211-26     Citation Subset:  IM    
SUNY College of Optometry, 33 W 42nd Street, New York, NY 10036, USA.
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MeSH Terms
Color Perception*
Discrimination (Psychology)
Photic Stimulation / methods
Sensory Thresholds
Grant Support
Erratum In:
Vision Res. 2002 Nov;42(24):2729.

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