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Shape from shading under inconsistent illumination.

John D Wilder1,2, Wendy J Adams3, Richard F Murray1

  • 1Department of Psychology and Centre for Vision Research, York University, Toronto, Canada.

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Summary
This summary is machine-generated.

The human visual system can perceive 3D shape from shading, even with complex, changing light. Our study shows we can adapt to varying illumination without detecting the changes.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • 3D shape from shading

Background:

  • Human visual system infers 3D surface shape from image shading cues.
  • Traditional theories assume a single estimated lighting direction for interpreting shading.

Purpose of the Study:

  • To investigate human visual system's ability to perceive 3D shape under complex, spatially varying illumination.
  • To determine if observers can detect changes in lighting direction across a surface while judging shape.

Main Methods:

  • Presenting stimuli with spatially varying illumination to human observers.
  • Assessing participants' ability to judge 3D surface shape.
  • Evaluating participants' detection of lighting direction changes.

Main Results:

  • Human visual system successfully judges 3D shape even with spatially varying illumination.
  • Shape perception is maintained when lighting changes occur at scales comparable to or larger than shape features.
  • Observers accommodate rapid lighting changes but are generally unable to detect them.

Conclusions:

  • The human visual system does not rely solely on a single estimated illumination direction.
  • The visual system can adapt to substantial and rapid variations in illumination across a surface.
  • Mechanisms for shape perception are robust to complex lighting conditions.