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Shape from shading under inconsistent illumination.

John D Wilder^1,2, Wendy J Adams³, Richard F Murray¹

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

Journal of Vision

|June 6, 2019

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.