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Related Experiment Videos

Color constancy under changes in reflected illumination.

Peter B Delahunt1, David H Brainard

  • 1Department of Ophthalmology and Section of Neurobiology, Physiology and Behavior, University of California Davis, CA, USA. pbdelahunt@ucdavis.edu

Journal of Vision
|October 21, 2004
PubMed
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The visual system compensates for changes in light spectrum due to light source and surface reflectance. Constancy was lower for reflected light changes than light source changes, driven by local surround.

Area of Science:

  • Visual perception
  • Color constancy
  • Computational neuroscience

Background:

  • The human visual system exhibits color constancy, enabling stable color perception despite changes in illumination spectrum.
  • Two primary physical processes alter illumination spectra: changes in the light source and changes in surrounding surface reflectance.
  • Understanding how the visual system compensates for these distinct spectral changes is crucial for visual science.

Purpose of the Study:

  • To measure color constancy under reflected light changes and compare it with constancy under light source changes.
  • To investigate the role of the local surround in reflected light constancy.
  • To examine asymmetric color matches across both types of illuminant changes.

Main Methods:

  • Observers viewed synthetic 3D scenes displayed on a stereoscope.

Related Experiment Videos

  • Achromatic adjustments were made to test surfaces under varying illumination conditions (light source and reflected light changes).
  • Asymmetric matches were performed across both types of illuminant changes.

    • Main Results:

    • The degree of color constancy varied with illuminant change direction, similarly for both reflected light and light source changes.
    • Overall color constancy was lower for reflected light changes compared to light source changes.
    • Constancy across reflected light changes was primarily driven by alterations in the test surface's local surround.

    Conclusions:

    • Color constancy mechanisms are sensitive to both light source and reflected light spectral changes.
    • Reflected light changes pose a greater challenge to color constancy than direct light source changes under the tested conditions.
    • The local surround plays a significant role in mediating color constancy for reflected light changes.