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Temporal aspects of spatial interactions affecting stereo-matching solutions.

Zhi-Lei Zhang1, Christopher Cantor, Tandra Ghose

  • 1Program in Vision Science, University of California at Berkeley, Berkeley, CA 94720-2020, USA.

Vision Research
|October 16, 2004
PubMed
Summary

Temporal proximity influences stereo-matching by affecting how neighboring features are perceived. Shorter intervals and higher contrast favor relative disparity, suggesting monocular persistence plays a key role in these visual interactions.

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Area of Science:

  • Visual perception
  • Computational neuroscience
  • Stereopsis

Background:

  • Stereo-matching algorithms aim to resolve ambiguity by minimizing absolute disparity (MAD) or relative disparity (MRD).
  • Spatial proximity of features typically biases stereo-matching towards MRD solutions when MAD and MRD conflict.

Purpose of the Study:

  • To investigate how temporal proximity of visual features influences the competition between minimum absolute disparity (MAD) and minimum relative disparity (MRD) stereo-matching solutions.
  • To determine the role of temporal factors, such as inter-stimulus interval (ISI), in modulating spatial interactions during stereopsis.

Main Methods:

  • Quantified the effect of varying inter-stimulus intervals (ISI) on stereo-matching choices.
  • Presented ambiguous disparity patterns and measured the likelihood of selecting MRD solutions under different ISI and contrast conditions.

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Main Results:

  • The likelihood of choosing MRD solutions decreased significantly as the ISI increased, with a time constant of 48.9 ms.
  • Reduced stimulus contrast at short ISIs increased the likelihood of MRD solutions, indicating a contrast-dependent temporal effect.

Conclusions:

  • Temporal proximity, specifically short inter-stimulus intervals, strengthens the influence of relative disparity (MRD) in stereo-matching.
  • The findings suggest that monocular persistence, a form of temporal impulse response, underlies these observed temporal interactions in stereopsis.