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Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
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The effect of viewpoint on perceived visual roughness.

Yun-Xian Ho1, Laurence T Maloney, Michael S Landy

  • 1Department of Psychology, New York University, New York, NY 10003, USA. yunxian.ho@nyu.edu

Journal of Vision
|April 28, 2007
PubMed
Summary

Human visual perception of surface roughness is imperfect. Observers misjudge roughness due to visual cues that mimic changes in illumination or viewpoint, indicating limitations in roughness constancy.

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Area of Science:

  • Visual perception
  • Surface texture analysis
  • Computational neuroscience

Background:

  • Previous research demonstrated failures in roughness constancy under varying illumination.
  • These failures were partly attributed to "pseudocues" that confound illumination with surface properties.
  • The role of viewpoint changes on roughness perception remained less explored.

Purpose of the Study:

  • To investigate how changes in observer viewpoint affect judgments of surface roughness.
  • To determine if the same "pseudocues" identified in illumination studies influence roughness perception with changing viewpoints.
  • To assess the extent of roughness constancy under altered viewing conditions.

Main Methods:

  • Experimentally manipulated observer viewpoint relative to textured surfaces.
  • Analyzed observer judgments of surface roughness.
  • Correlated perceived roughness with identified visual cues (e.g., luminance, shadow proportion, texture contrast).

Main Results:

  • Observers showed systematic failures in roughness constancy when their viewpoint changed.
  • A significant portion of these failures could be explained by the same "pseudocues" observed in illumination studies.
  • The visual system's reliance on these pseudocues persists across different visual tasks.

Conclusions:

  • The human visual system exhibits imperfect roughness constancy, even when depth cues are available.
  • Visual perception of surface roughness is susceptible to confounding factors like illumination and viewpoint.
  • The visual system does not always utilize the most accurate cues for estimating surface roughness.