| Relative flattening between velvet and matte 3D shapes: Evidence for similar shape-from-shading computations. | |
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MedLine Citation:
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PMID: 22214564 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Among 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. |
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Authors:
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Maarten W A Wijntjes; Katja Doerschner; Gizem Kucukoglu; Sylvia C Pont |
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Publication Detail:
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Type: Journal Article Date: 2012-01-01 |
Journal Detail:
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Title: Journal of vision Volume: 12 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2012 |
Date Detail:
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Created Date: 2012-01-04 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: - Citation Subset: IM |
Affiliation:
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Faculty of Industrial Design Engineering, Delft University of Technology, Delft, Netherlands. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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