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Related Experiment Videos

Cone contrast computations: physical versus perceived background and colour constancy.

A Daugirdiene1, I J Murray, H Vaitkevicius

  • 1Department of Psychology and Didactics, Vilnius Pedagogical University, Studentu 39, LT-08106 Vilnius, Lithuania.

Spatial Vision
|July 26, 2006
PubMed
Summary
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The cone-contrast rule, which explains how visual systems perceive object color, was found to be violated under different illuminants. However, the rule applied when accounting for the perceived background color under the test illumination.

Area of Science:

  • Vision science
  • Color perception
  • Computational neuroscience

Background:

  • Object color perception is ambiguous due to surface properties and illuminant variations.
  • Visual systems use cone-contrasts relative to backgrounds to resolve this ambiguity.
  • The cone-contrast rule posits that cone-contrasts under a test illuminant should match those under a standard illuminant.

Purpose of the Study:

  • To investigate the validity of the cone-contrast rule under varying illuminants.
  • To explore the relationship between the cone-contrast rule and the stability of perceived color.
  • To determine if adjusting the reference point for cone-contrast calculations improves rule adherence.

Main Methods:

  • A successive asymmetric color-matching task was employed with simulated Munsell samples and a neutral background.

Related Experiment Videos

  • Six different test illuminants were used.
  • The Brunswik Ratio was calculated to assess the stability of perceived color appearance.

    • Main Results:

    • The cone-contrast rule was violated when using the standard illuminant C as a reference, especially for S-cone-contrast.
    • The cone-contrast rule was upheld when the reference point was adjusted to the perceived background color under the test illuminant.
    • This suggests a mechanism for discounting the illuminant in calculating object-background cone-contrasts.

    Conclusions:

    • The cone-contrast rule is valid when accounting for the perceived background color, indicating illuminant discounting.
    • This adjusted cone-contrast provides a stable measure of an object's properties independent of illumination.
    • However, these cone-contrasts alone do not determine absolute color appearance without calibration.