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08:04
Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
Published on: December 4, 2013
Interactions between chromatic- and luminance-contrast-sensitive stereopsis mechanisms
David R Simmons1, Frederick A A Kingdom
1Department of Psychology, University of Glasgow, 58 Hillhead Street, G12 8QB, Glasgow, UK. d.r.simmons@psy.gla.ac.uk
Vision Research
|June 21, 2002
Summary
Chromatic and luminance contrast interact in stereopsis. Anti-correlated chromatic contrast disrupts achromatic stereopsis, while anti-correlated luminance contrast disrupts chromatic stereopsis, suggesting complex interactions between visual processing mechanisms.
Area of Science:
- Visual Neuroscience
- Computational Vision
- Perception Psychology
Background:
- Chromatic information aids stereo correspondence.
- Two independent stereopsis mechanisms exist: one for chromatic contrast, another for luminance contrast.
- The interaction between these mechanisms in stereo vision is not fully understood.
Purpose of the Study:
- To investigate how chromatic and luminance contrast interact in stereopsis.
- To determine if interactions occur between chromatic and luminance stereopsis mechanisms.
Main Methods:
- Disparity thresholds were measured using Gabor patches (0.5 cpd).
- Stimuli varied in relative amounts of correlated and anti-correlated chromatic and luminance contrast.
- Stereoscopic performance was compared across compound, isoluminant, and isochromatic stimuli.
Main Results:
- Anti-correlated chromatic contrast significantly disrupted achromatic stereopsis.
- Anti-correlated luminance contrast significantly disrupted chromatic stereopsis.
- Correlated chromatic and luminance contrast improved stereoacuity.
Conclusions:
- Data support positive and negative interactions between chromatic and achromatic stereopsis mechanisms.
- These interactions occur after disparity encoding but before depth extraction.
- Interactions can be modeled by probability summation of depth sign information between independent mechanisms.
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