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Article: Perception of 3D surface orientation from skew symmetry

TitlePerception of 3D surface orientation from skew symmetry
Authors
Issue Date2001
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/visres
Citation
Vision Research, 2001, v. 41 n. 24, p. 3163-3183 How to Cite?
AbstractIn this paper, we investigate how symmetry can be used to perceive 3D surface orientation. When a symmetric planar object is viewed from an angle, the projected contour has skew symmetry, which provides partial information about the 3D orientation of the object. For a given skew symmetry, this information can be characterized by a constraint curve of possible slant/tilt combinations that are consistent with a mirror-symmetric interpretation. These constraint curves move around when an object is rotated within a plane, and depend on what we will term the spin of the object: the angle between its axis of symmetry and the direction of tilt. To test the influence of symmetry constraint curves, we presented subjects with stereo images of symmetric objects that varied in spin, and had them perform an orientation-matching task. We found that the judgments showed biases that depended on the spin of the objects. Since other sources of information depend only on slant and tilt, not on spin, the biases imply that skew symmetry contributed to subjects' judgments. In a second experiment, we introduced conflicts between stereo and symmetry cues, and found that the spin-dependent biases can be modulated by selectively changing stereo slant. We propose an explanation of these results involving the optimal integration of stereo and skew symmetry, and present a Bayesian model that can account for the pattern of biases. © 2001 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/168942
ISSN
2015 Impact Factor: 1.776
2015 SCImago Journal Rankings: 0.957
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSaunders, JAen_US
dc.contributor.authorKnill, DCen_US
dc.date.accessioned2012-10-08T03:39:56Z-
dc.date.available2012-10-08T03:39:56Z-
dc.date.issued2001en_US
dc.identifier.citationVision Research, 2001, v. 41 n. 24, p. 3163-3183en_US
dc.identifier.issn0042-6989en_US
dc.identifier.urihttp://hdl.handle.net/10722/168942-
dc.description.abstractIn this paper, we investigate how symmetry can be used to perceive 3D surface orientation. When a symmetric planar object is viewed from an angle, the projected contour has skew symmetry, which provides partial information about the 3D orientation of the object. For a given skew symmetry, this information can be characterized by a constraint curve of possible slant/tilt combinations that are consistent with a mirror-symmetric interpretation. These constraint curves move around when an object is rotated within a plane, and depend on what we will term the spin of the object: the angle between its axis of symmetry and the direction of tilt. To test the influence of symmetry constraint curves, we presented subjects with stereo images of symmetric objects that varied in spin, and had them perform an orientation-matching task. We found that the judgments showed biases that depended on the spin of the objects. Since other sources of information depend only on slant and tilt, not on spin, the biases imply that skew symmetry contributed to subjects' judgments. In a second experiment, we introduced conflicts between stereo and symmetry cues, and found that the spin-dependent biases can be modulated by selectively changing stereo slant. We propose an explanation of these results involving the optimal integration of stereo and skew symmetry, and present a Bayesian model that can account for the pattern of biases. © 2001 Elsevier Science Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/visresen_US
dc.relation.ispartofVision Researchen_US
dc.subject.meshAnalysis Of Varianceen_US
dc.subject.meshBayes Theoremen_US
dc.subject.meshCuesen_US
dc.subject.meshDepth Perception - Physiologyen_US
dc.subject.meshHumansen_US
dc.subject.meshLikelihood Functionsen_US
dc.subject.meshMathematicsen_US
dc.subject.meshNormal Distributionen_US
dc.subject.meshOrientation - Physiologyen_US
dc.titlePerception of 3D surface orientation from skew symmetryen_US
dc.typeArticleen_US
dc.identifier.emailSaunders, JA:jsaun@hkucc.hku.hken_US
dc.identifier.authoritySaunders, JA=rp00638en_US
dc.description.naturelink_to_OA_fulltexten_US
dc.identifier.doi10.1016/S0042-6989(01)00187-0en_US
dc.identifier.pmid11711141-
dc.identifier.scopuseid_2-s2.0-0034757172en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034757172&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume41en_US
dc.identifier.issue24en_US
dc.identifier.spage3163en_US
dc.identifier.epage3183en_US
dc.identifier.isiWOS:000172770800009-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridSaunders, JA=7402341514en_US
dc.identifier.scopusauthoridKnill, DC=7003848696en_US
dc.identifier.citeulike2811291-

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