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Fine-scale processing in human binocular stereopsis

J M Harris1, S P McKee, H S Smallman

  • 1Department of Pharmacology, University of Edinburgh, UK.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|August 1, 1997
PubMed
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Human stereopsis relies on fine-scale disparity processing within small visual regions. This study reveals that the human visual system integrates information over areas as small as 4-6 arc minutes for accurate depth perception.

Area of Science:

  • Visual neuroscience
  • Human psychophysics
  • Computational vision

Background:

  • The human visual system excels at detecting minute differences in binocular disparity.
  • The spatial scale of monocular information integration for disparity processing remains unclear.

Purpose of the Study:

  • To determine the minimal spatial scale for disparity processing.
  • To characterize computations in disparity discrimination units.
  • To constrain correlator models of stereopsis.

Main Methods:

  • Psychophysical experiments measuring disparity discrimination of a target dot among noise dots.
  • Analysis of human performance with varying noise dot configurations.
  • Evaluation of simple correlator models against psychophysical data.

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Main Results:

  • Human observers can discern target dot disparity even with uncorrelated or coplanar noise dots.
  • Correlator models require integration over very small image regions and disparity ranges to match human performance.
  • Fine-scale disparity processing is mediated by foveal mechanisms.

Conclusions:

  • The stereo system receives fine-scale input.
  • Spatial integration for disparity processing occurs over regions as small as 4-6 arc minutes in diameter.
  • Simple correlator models need specific constraints to explain human stereoscopic abilities at fine scales.