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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Evidence for relative disparity matching in the perception of an ambiguous stereogram
Authors: Goutcher, Ross
Hibbard, Paul
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Keywords: binocular vision
computational modeling
absolute disparity
relative disparity
Issue Date: Oct-2010
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Citation: Goutcher R & Hibbard P (2010) Evidence for relative disparity matching in the perception of an ambiguous stereogram, Journal of Vision, 10 (12).
Abstract: To compute depth from binocular disparity, the visual system must correctly link corresponding points between two images, given multiple possible correspondences. Typically, model solutions to this problem use some form of local spatial smoothing, with many physiologically inspired models doing so implicitly, through the use of local cross-correlation-like procedures. In this paper we show that implicit smoothing, without the explicit consideration of relative disparity, cannot account for biases in the perception of a novel ambiguous stereo stimulus. Observers viewed a stereogram consisting of multiple strips of periodic random-dot patterns, perceived as either a slanted surface, or a triangular wedge in depth, and reported their perception in a 4AFC task. Biases in the perception of this stimulus are shown to depend upon the stimulus configuration in its entirety, and cannot be accounted for by low-level preferences for disparity sign. Such results are not consistent with local smoothing effects arising solely at the level of cross-correlation-like absolute disparity detectors. Instead, our results suggest the presence of smoothing constraints that consider the differences in disparity between neighboring image regions. These results further suggest that such smoothing generally biases matching toward solutions that minimize relative disparity, regardless of the presence of changes in disparity sign.
Type: Journal Article
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Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Psychology
University of St Andrews

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