Systematic distortions of shape from stereopsis

Vision Res. 1991;31(7-8):1351-60. doi: 10.1016/0042-6989(91)90056-b.


The effectiveness of disparity information in defining 3-D shape was investigated by means of judgements of the shape of cylindrical continuous curved surfaces presented as random dot stereograms. At a close viewing distance, truly circular cylinders appeared elongated; at an intermediate distance, perception was close to veridical; and, at a far distance, cylinders appeared flattened. Indirect measures of scaling distance were calculated from these data. The results strongly suggest that the observed shape distortions are a consequence of scaling horizontal disparities with an incorrect measure of egocentric distance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Depth Perception / physiology*
  • Female
  • Humans
  • Mathematics
  • Pattern Recognition, Visual / physiology*
  • Perceptual Distortion / physiology*
  • Psychometrics
  • Vision Disparity / physiology
  • Vision, Binocular / physiology