Occlusion Constraints and Stereoscopic Slant

In binocular vision horizontal magnification of one retinal image leads to a percept of three-dimensional slant around a vertical axis. It is demonstrated that the perception of slant is diminished when an occlusion interpretation is possible. A frontoparallel plane located in the immediate vicinity...

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Bibliographic Details
Published in:Perception (London) 1997-01, Vol.26 (1), p.29-38
Main Authors: Häkkinen, Jukka, Nyman, Göte
Format: Article
Language:English
Subjects:
Biological and medical sciences
Depth Perception
Form Perception
Fundamental and applied biological sciences. Psychology
Humans
Perception
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Vision
Vision, Binocular
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Summary:In binocular vision horizontal magnification of one retinal image leads to a percept of three-dimensional slant around a vertical axis. It is demonstrated that the perception of slant is diminished when an occlusion interpretation is possible. A frontoparallel plane located in the immediate vicinity of a slanted surface in a location which allows a perception of occlusion reduces the magnitude of perceived slant significantly. When the same plane is placed on the other side, the slant perception is normal because there is no alternative occlusion interpretation. The results indicate that a common border between the occluder and a slanted surface is not a necessary condition for the reduction effect. If the edges are displaced and the edge of the slanted surface is placed in a location in which it could be occluded, the effect still appears.
ISSN:0301-0066
1468-4233
DOI:10.1068/p260029