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Color constancy by asymmetric color matching with real objects in three-dimensional scenes

Published online by Cambridge University Press:  05 April 2005

VASCO M.N. de ALMEIDA ,
PAULO T. FIADEIRO  and
SÉRGIO M.C. NASCIMENTO
VASCO M.N. de ALMEIDA
Affiliation:
Remote Sensing Unit/Department of Physics, University of Beira Interior, 6201-001 Covilhã, Portugal
PAULO T. FIADEIRO
Affiliation:
Remote Sensing Unit/Department of Physics, University of Beira Interior, 6201-001 Covilhã, Portugal
SÉRGIO M.C. NASCIMENTO
Affiliation:
Department of Physics, Gualtar Campus, University of Minho, 4710-057 Braga, Portugal
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Abstract

Color matching experiments use, in general, stimuli that are poor representations of the natural world. The aim of this work was to compare the degree of color constancy for a range of illuminant pairs using a new matching technique that uses both real objects and three-dimensional (3-D) real scenes. In the experiment, observers viewed a 3-D real scene through a large beamsplitter that projects on the right-hand side of the scene (match scene), the virtual image of a 3-D object (match object) such it appeared part of the scene. On the left-hand side of the scene (test scene), observers viewed a symmetrical scene containing a test object identical to the match object. Test and match objects were both surrounded by the same reflectances with identical spatial arrangement. The illuminant on the test scene had always a correlated color temperature of 25,000 K. The illuminant on the match scene could be any of seven different illuminants with correlated color temperatures in the range 25,000 K–4000 K. In each trial, the observers, who were instructed to perform surface color matches, adjusted the illuminant on the match object. Constancy indices were very high (0.81–0.93), varied with the color of the match object, and increased with the extent of the illuminant change. Observer's mismatches, however, were independent of the extent of the illuminant change.

Keywords

Color constancyColor matchingReal scenesColor vision
Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 3 , May 2004 , pp. 341 - 345
Copyright
© 2004 Cambridge University Press

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