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dc.contributor.authorWijntjes, M. W. A.en_US
dc.contributor.authorDoerschner, K.en_US
dc.contributor.authorKucukoglu, G.en_US
dc.contributor.authorPont, S. C.en_US
dc.date.accessioned2016-02-08T09:46:42Z
dc.date.available2016-02-08T09:46:42Z
dc.date.issued2012en_US
dc.identifier.urihttp://hdl.handle.net/11693/21466en_US
dc.description.abstractAmong other cues, the visual system uses shading to infer the 3D shape of objects. The shading pattern depends on the illumination and reflectance properties (BRDF). In this study, we compared 3D shape perception between identical shapes with different BRDFs. The stimuli were photographed 3D printed random smooth shapes that were either painted matte gray or had a gray velvet layer. We used the gauge figure task (J. J. Koenderink, A. J. van Doorn, & A. M. L. Kappers, 1992) to quantify 3D shape perception. We found that the shape of velvet objects was systematically perceived to be flatter than the matte objects. Furthermore, observers' judgments were more similar for matte shapes than for velvet shapes. Lastly, we compared subjective with veridical reliefs and found large systematic differences: Both matte and velvet shapes were perceived more flat than the actual shape. The isophote pattern of a flattened Lambertian shape resembles the isophote pattern of an unflattened velvet shape. We argue that the visual system uses a similar shape-from-shading computation for matte and velvet objects that partly discounts material properties.en_US
dc.source.titleJournal of Visionen_US
dc.relation.isversionofhttp://dx.doi.org/10.1167/12.1.2en_US
dc.subject3D surface and shape perceptionen_US
dc.subjectShadingen_US
dc.subjectEcological opticsen_US
dc.titleRelative flattening between velvet and matte 3D shapes: Evidence for similar shape-from-shading computationsen_US
dc.typeArticleen_US
dc.departmentDepartment of Psychologyen_US
dc.citation.spage1en_US
dc.citation.epage11en_US
dc.citation.volumeNumber12en_US
dc.citation.issueNumber1en_US
dc.identifier.doi10.1167/12.1.2en_US
dc.publisherAssociation for Research in Vision and Ophthalmologyen_US
dc.identifier.eissn1534-7362


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