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Latitude and longitude vertical disparities

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Read, J. C. A., Phillipson, G. P. and Glennerster, A. (2009) Latitude and longitude vertical disparities. Journal of Vision, 9 (13). pp. 1-37. ISSN 1534-7362

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To link to this article DOI: 10.1167/9.13.11

Abstract/Summary

The literature on vertical disparity is complicated by the fact that several different definitions of the term “vertical disparity” are in common use, often without a clear statement about which is intended or a widespread appreciation of the properties of the different definitions. Here, we examine two definitions of retinal vertical disparity: elevation-latitude and elevation-longitude disparities. Near the fixation point, these definitions become equivalent, but in general, they have quite different dependences on object distance and binocular eye posture, which have not previously been spelt out. We present analytical approximations for each type of vertical disparity, valid for more general conditions than previous derivations in the literature: we do not restrict ourselves to objects near the fixation point or near the plane of regard, and we allow for non-zero torsion, cyclovergence, and vertical misalignments of the eyes. We use these expressions to derive estimates of the latitude and longitude vertical disparities expected at each point in the visual field, averaged over all natural viewing. Finally, we present analytical expressions showing how binocular eye position—gaze direction, convergence, torsion, cyclovergence, and vertical misalignment—can be derived from the vertical disparity field and its derivatives at the fovea.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Neuroscience
Faculty of Life Sciences > School of Psychology and Clinical Language Sciences > Perception and Action
ID Code:2056
Uncontrolled Keywords:binocular vision; stereopsis; depth perception; induced effect; vertical disparity; computational vision
Publisher:Association for Research in Vision and Ophthalmology (ARVO)
Publisher Statement:Copyright © 2004 by The Association for Research in Vision and Ophthalmology All Rights Reserved With the exception of material authored by government employees working in an official capacity, copyright for all material published in Journal of Vision is assigned to the Association for Research in Vision and Ophthalmology (ARVO). Users may view, reproduce or store copies of articles comprising the journal provided that the articles are used only for their personal, non-commercial use. Uses beyond that allowed by the "Fair Use" limitations (sections 107 and 108) of the U.S. Copyright law require permission which must be obtained in writing from the Journal of Vision Editorial Office (see contact information below). Any uses and or copies of Journal of Vision articles, either in whole or in part, must include the customary bibliographic citation, including author attribution, date, article title, journal name, DOI and/or URL, and copyright notice.

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