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Proceedings Paper

Experimental studies of instantaneous color constancy: dynamic color matching under rapid changes of illuminant
Author(s): John L. Barbur; Darryl de Cunha; Cristyn B. Williams; Gordon Plant
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Paper Abstract

We have extended the experiments of McCann et al., (1976) by incorporating the Mondrian stimulus into a dynamic colour matching (DCM) technique that allows the subject to match accurately the colour of any test patch under sequential changes of illuminant. We have also studied how scattered light affects the measured instantaneous colour constancy (ICC) index. The results show that correction for forward light scatter in the eye can increase significantly the measured ICC index. The changes in the perceived colour of a central test stimulus as a result of surround illuminant changes was investigated in a number of successful binocular and dichoptic experiments. The contribution made by distant patches to ICC was found to be small with the immediate surround (i.e., less than 2 degree(s) separation) contributing over 50% of the constancy effect. A number of subjects with partial loss of ability to see and discriminate colours caused by damage to ventromedial pre-striate visual cortex were also investigated. In order to establish the site of ICC mechanisms, the dynamic colour matching technique was modified to make it suitable for studies in patients with unilateral damage to the primary visual cortex.

Paper Details

Date Published: 30 May 2002
PDF: 17 pages
Proc. SPIE 4662, Human Vision and Electronic Imaging VII, (30 May 2002); doi: 10.1117/12.469526
Show Author Affiliations
John L. Barbur, City Univ. (United Kingdom)
Darryl de Cunha, Kings College (United Kingdom)
Cristyn B. Williams, McGill Vision Research Centre (Canada)
Gordon Plant, The National Hospital for Neurology (United Kingdom)

Published in SPIE Proceedings Vol. 4662:
Human Vision and Electronic Imaging VII
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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