Suggesting that the illumination differs between two scenes does not enhance color constancy

Jeroen J M Granzier, Jeroen B J Smeets, Eli Brenner

    Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

    Abstract

    Color constancy involves correctly attributing a bias in the color of the light reaching your eyes to the illumination, and therefore compensating for it when judging surface reflectance. But not all biases are caused by the illumination, and surface colors will be misjudged if a bias is incorrectly attributed to the illumination. Evidence from within a scene (highlights, shadows, gradients, mutual reflections etc) could help determine whether a bias is likely to be due to the illumination. To examine whether the human visual system considers such evidence we asked subjects to match two surfaces on differently colored textured backgrounds. When the backgrounds were visibly rendered on screens in an otherwise dark room, the influence of the difference in background color was modest, indicating that subjects did not attribute much of the difference in color to the illumination. When the simulation of a change in illumination was more realistic, the results were very similar. We conclude that the visual system does not seem to use a sophisticated analysis of the possible illumination in order to obtain color constancy.

    Original languageEnglish
    Title of host publication6th European Conference on Colour in Graphics, Imaging, and Vision 2012, CGIV 2012
    Pages325-330
    Number of pages6
    Publication statusPublished - 2012
    Event6th European Conference on Colour in Graphics, Imaging, and Vision 2012, CGIV 2012 - Amsterdam, Netherlands
    Duration: 6 May 20129 May 2012

    Conference

    Conference6th European Conference on Colour in Graphics, Imaging, and Vision 2012, CGIV 2012
    CountryNetherlands
    CityAmsterdam
    Period6/05/129/05/12

    Keywords

    • Color constancy
    • Color vision/psychophysics

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