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Conference Paper: Effect of symmetry on perception of 3D shape from stereo and shading
Title | Effect of symmetry on perception of 3D shape from stereo and shading |
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Authors | |
Keywords | Medical sciences Ophthalmology and optometry |
Issue Date | 2013 |
Publisher | Association for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/ |
Citation | The 13th Annual Meeting of the Vision Sciences Society (VSS 2013), Naples, FL., 10-15 May 2013. In Journal of Vision, 2013, v. 13 n. 9 article 261 How to Cite? |
Abstract | Symmetry has been found to improve 3D shape discrimination across change in viewpoint and lighting. We tested whether this benefit is due to use of symmetry as constraint for interpreting 3D information from stereo and shading. Observers performed sequential 3D shape discrimination of random, smoothly-curved symmetric objects that were rotated in depth by various amounts (0°-60°). We manipulated the 3D information provided by symmetry by varying the orientation of an object’s symmetry plane relative to the direction of viewpoint rotation. Base orientation of the symmetry plane was either horizontal or vertical, and viewpoint rotation was either horizontal or vertical. In Experiment 1, objects were presented in stereo with no shading information. We found that discrimination was better when rotation was perpendicular to the symmetry plane, which causes the symmetry plane to be slanted in depth, than when the rotation was parallel to the symmetry plane, which keeps the symmetry plane aligned with the line of sight. In Experiment 2, objects were presented monocularly with Lambertian shading, and lighting direction was varied from above-left to front-right. Performance was better for objects with a vertical symmetry plane than those with a horizontal symmetry plane with and without viewpoint rotation. In both experiments, symmetry was most advantageous when the constraint imposed by symmetry was complementary to the ambiguity from stereo or shading information. |
Description | Poster Session - 3D perception: Shape from shading and contours: no. 23.541 This journal issue entitled: Vision Sciences Society Meeting, 2013: Abstracts Open Access Journal |
Persistent Identifier | http://hdl.handle.net/10722/198219 |
ISSN | 2023 Impact Factor: 2.0 2023 SCImago Journal Rankings: 0.849 |
DC Field | Value | Language |
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dc.contributor.author | Lee, YL | en_US |
dc.contributor.author | Saunders, JA | en_US |
dc.date.accessioned | 2014-06-25T02:55:41Z | - |
dc.date.available | 2014-06-25T02:55:41Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.citation | The 13th Annual Meeting of the Vision Sciences Society (VSS 2013), Naples, FL., 10-15 May 2013. In Journal of Vision, 2013, v. 13 n. 9 article 261 | en_US |
dc.identifier.issn | 1534-7362 | - |
dc.identifier.uri | http://hdl.handle.net/10722/198219 | - |
dc.description | Poster Session - 3D perception: Shape from shading and contours: no. 23.541 | - |
dc.description | This journal issue entitled: Vision Sciences Society Meeting, 2013: Abstracts | - |
dc.description | Open Access Journal | - |
dc.description.abstract | Symmetry has been found to improve 3D shape discrimination across change in viewpoint and lighting. We tested whether this benefit is due to use of symmetry as constraint for interpreting 3D information from stereo and shading. Observers performed sequential 3D shape discrimination of random, smoothly-curved symmetric objects that were rotated in depth by various amounts (0°-60°). We manipulated the 3D information provided by symmetry by varying the orientation of an object’s symmetry plane relative to the direction of viewpoint rotation. Base orientation of the symmetry plane was either horizontal or vertical, and viewpoint rotation was either horizontal or vertical. In Experiment 1, objects were presented in stereo with no shading information. We found that discrimination was better when rotation was perpendicular to the symmetry plane, which causes the symmetry plane to be slanted in depth, than when the rotation was parallel to the symmetry plane, which keeps the symmetry plane aligned with the line of sight. In Experiment 2, objects were presented monocularly with Lambertian shading, and lighting direction was varied from above-left to front-right. Performance was better for objects with a vertical symmetry plane than those with a horizontal symmetry plane with and without viewpoint rotation. In both experiments, symmetry was most advantageous when the constraint imposed by symmetry was complementary to the ambiguity from stereo or shading information. | en_US |
dc.language | eng | en_US |
dc.publisher | Association for Research in Vision and Ophthalmology. The Journal's web site is located at http://wwwjournalofvisionorg/ | - |
dc.relation.ispartof | Journal of Vision | en_US |
dc.subject | Medical sciences | - |
dc.subject | Ophthalmology and optometry | - |
dc.title | Effect of symmetry on perception of 3D shape from stereo and shading | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Lee, YL: younglee@hku.hk | en_US |
dc.identifier.email | Saunders, JA: jsaun@hku.hk | - |
dc.identifier.authority | Lee, YL=rp00866 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1167/13.9.261 | - |
dc.identifier.hkuros | 229484 | en_US |
dc.identifier.volume | 13 | - |
dc.identifier.issue | 9 | - |
dc.publisher.place | United States | - |
dc.customcontrol.immutable | sml 140626 | - |
dc.identifier.issnl | 1534-7362 | - |