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Related Experiment Videos

Size constancy in structure from motion

J Turner1, M L Braunstein

  • 1Department of Cognitive Sciences, School of Social Sciences, University of California, Irvine 92717-5100, USA. jessica@aris.ss.uci.edu

Perception
|January 1, 1995
PubMed
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Depth perception from motion cues is object-centered, not viewer-centered. Judged object size in structure-from-motion displays, even without perspective, correlated with simulated depth, suggesting depth information is integrated into a viewer-centered framework.

Area of Science:

  • * Visual perception
  • * Computational neuroscience
  • * Psychophysics

Background:

  • * Structure-from-motion (SfM) displays use relative object motion to infer 3D structure.
  • * Depth information from SfM is typically considered object-centered, independent of viewer position.
  • * Size constancy, the perception of an object's actual size despite changes in retinal image size, is usually linked to perspective cues and viewer-centered distance estimation.

Purpose of the Study:

  • * To investigate how depth information derived from SfM is utilized in size perception.
  • * To determine if object-centered depth cues influence size judgments in the absence of perspective.
  • * To explore the integration of object-centered depth information into a viewer-centered framework.

Main Methods:

Related Experiment Videos

  • * Five participants viewed structure-from-motion displays generated using parallel projection, which lacks perspective cues.
  • * Subjects were tasked with judging the relative sizes of objects within these dynamic scenes.
  • * The experimental setup manipulated simulated depth separation between objects.

Main Results:

  • * Judged object size was significantly correlated with the simulated depth separation, even without explicit perspective information.
  • * This indicates that perceived size is influenced by the inferred depth, regardless of the projection type.
  • * The findings challenge the notion that size constancy solely relies on viewer-centered perspective cues.

Conclusions:

  • * Relative depth information extracted from structure-from-motion is integrated into a viewer-centered representation.
  • * This suggests a more flexible interplay between object-centered and viewer-centered processing in visual perception.
  • * The study highlights the brain's ability to construct a coherent 3D percept from various visual cues.