Shape from stereo: A systematic approach using quadratic surfaces

Sjoerd C. De Vries, Astrid M L Kappers, Jan J. Koenderink

Research output: Contribution to JournalArticleAcademicpeer-review


We used quadratic shapes in several psychophysical shape-from-stereo tasks. The shapes were elegantly represented in a 2-D parameter space by the scale-independent shape index and the scale-dependent curvedness. Using random-dot stereograms to depict the surfaces, we found that the shape of hyperbolic surfaces is slightly more difficult to recognize than the shape of elliptic surfaces. We found that curvedness (and indirectly, scale) has little or no influence on shape recognition.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalPerception & Psychophysics
Issue number1
Publication statusPublished - Jan 1993


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