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Surround articulation. II. Lightness judgments.

J A Schirillo1

  • 1Department of Psychology, Wake Forest University, Winston-Salem, North Carolina 27109, USA.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|April 8, 1999
PubMed
Summary

Lightness perception requires estimating illumination. Surround articulation helps distinguish illumination from reflectance changes, improving lightness constancy, especially for increments.

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Area of Science:

  • Visual perception
  • Color constancy
  • Lightness judgments

Background:

  • Color constancy relies on estimating illumination.
  • Surround articulation may aid in distinguishing illumination from reflectance changes.

Purpose of the Study:

  • To investigate how surround articulation affects lightness judgments.
  • To determine if articulation is necessary for lightness constancy.

Main Methods:

  • Introducing incremental and decremental patches to a surround (articulation).
  • Preserving the surround's space-average luminance during articulation.
  • Comparing lightness judgments with and without articulation.

Main Results:

  • Articulation enhances the interpretation of luminance edges as illumination changes.
  • Lightness judgments correlate perfectly with local ratio matches after articulation.
  • Lightness constancy is not dependent on articulation for decrements.

Conclusions:

  • Surround articulation facilitates accurate lightness judgments by aiding illuminant estimation.
  • These findings explain previous results with complex vs. simple surrounds.
  • Articulation is crucial for increment-related lightness constancy but not for decrements.

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