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Conference Paper: Symmetry facilitates 3D shape discrimination across changes in viewpoint

TitleSymmetry facilitates 3D shape discrimination across changes in viewpoint
Authors
Issue Date2011
PublisherPion Ltd.. The Journal's web site is located at http://i-perception.perceptionweb.com/journal/I/
Citation
The 7th Asia-Pacific Conference on Vision (APCV 2011), Hong Kong, 15-18 July 2011. In i-Perception, 2011, v. 2 n. 4, article no. 403 How to Cite?
AbstractPerceiving 3D shape constancy across changes in viewpoint is a challenging problem. We tested whether the presence of symmetry can facilitate shape discrimination for smoothly curved, solid 3D objects. Symmetric and asymmetric random shapes were generated to have the same angular power spectra, expressed as spherical harmonics. Objects were presented in three viewing conditions: shading-only, stereo-only, and combined shading and stereo. Shaded objects were illuminated by a diffused point light source, and a mirror haploscope was used to present binocular images. Objects were presented sequentially and observers judged whether the two shapes were same or different. The test objects were either the same orientation or differed by a rotation in depth of ±15°, ±30°, or ±60° relative to the standard object. In all conditions, we found that shape discrimination performance decreased with rotation in depth. Overall, shape discrimination for symmetric objects was better than for asymmetric objects. The presence of stereo information improved performance for both symmetric and asymmetric objects. The results suggest that structural constraints like symmetry are important for viewpoint invariant shape perception, and that stereo information improves shape perception even for structured 3D objects.
DescriptionOpen Access Journal
亞太視覺會議, APCV 2011
Poster Session - 3D Perception: article no. 403
Persistent Identifierhttp://hdl.handle.net/10722/136192
ISSN

 

DC FieldValueLanguage
dc.contributor.authorLee, YLen_US
dc.contributor.authorSaunders, JAen_US
dc.date.accessioned2011-07-27T02:04:24Z-
dc.date.available2011-07-27T02:04:24Z-
dc.date.issued2011en_US
dc.identifier.citationThe 7th Asia-Pacific Conference on Vision (APCV 2011), Hong Kong, 15-18 July 2011. In i-Perception, 2011, v. 2 n. 4, article no. 403en_US
dc.identifier.issn2041-6695 (electronic)-
dc.identifier.urihttp://hdl.handle.net/10722/136192-
dc.descriptionOpen Access Journal-
dc.description亞太視覺會議, APCV 2011-
dc.descriptionPoster Session - 3D Perception: article no. 403-
dc.description.abstractPerceiving 3D shape constancy across changes in viewpoint is a challenging problem. We tested whether the presence of symmetry can facilitate shape discrimination for smoothly curved, solid 3D objects. Symmetric and asymmetric random shapes were generated to have the same angular power spectra, expressed as spherical harmonics. Objects were presented in three viewing conditions: shading-only, stereo-only, and combined shading and stereo. Shaded objects were illuminated by a diffused point light source, and a mirror haploscope was used to present binocular images. Objects were presented sequentially and observers judged whether the two shapes were same or different. The test objects were either the same orientation or differed by a rotation in depth of ±15°, ±30°, or ±60° relative to the standard object. In all conditions, we found that shape discrimination performance decreased with rotation in depth. Overall, shape discrimination for symmetric objects was better than for asymmetric objects. The presence of stereo information improved performance for both symmetric and asymmetric objects. The results suggest that structural constraints like symmetry are important for viewpoint invariant shape perception, and that stereo information improves shape perception even for structured 3D objects.-
dc.languageengen_US
dc.publisherPion Ltd.. The Journal's web site is located at http://i-perception.perceptionweb.com/journal/I/-
dc.relation.ispartofi-Perceptionen_US
dc.rightsCopyright is retained by the author(s) of this article. This open-access article is distributed under a Creative Commons Licence, which permits noncommercial use, distribution, and reproduction, provided the original author(s) and source are credited and no alterations are made.-
dc.titleSymmetry facilitates 3D shape discrimination across changes in viewpointen_US
dc.typeConference_Paperen_US
dc.identifier.emailLee, YL: younglee@hku.hken_US
dc.identifier.emailSaunders, JA: jsaun@hkucc.hku.hken_US
dc.identifier.authorityLee, YL=rp00866en_US
dc.identifier.authoritySaunders, JA=rp00638en_US
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1068/ic403-
dc.identifier.hkuros187004en_US
dc.identifier.volume2-
dc.identifier.issue4-
dc.publisher.placeUnited Kingdom-
dc.description.otherThe 7th Asia-Pacific Conference on Vision (APCV 2011), Hong Kong, 15-18 July 2011. In i-Perception, 2011, v. 2 n. 4, article no. 403-

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