• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Economics, Administrative And Social Sciences
      • Department of Psychology
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Economics, Administrative And Social Sciences
      • Department of Psychology
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Effects of surface reflectance and 3D shape on perceived rotation axis

      Thumbnail
      View / Download
      1.5 Mb
      Author
      Doerschner, K.
      Yilmaz, O.
      Kucukoglu, G.
      Fleming, R. W.
      Date
      2013
      Source Title
      Journal of Vision
      Electronic ISSN
      1534-7362
      Publisher
      Association for Research in Vision and Ophthalmology
      Volume
      13
      Issue
      11
      Pages
      1 - 23
      Type
      Article
      Item Usage Stats
      124
      views
      104
      downloads
      Abstract
      Surface specularity distorts the optic flow generated by a moving object in a way that provides important cues for identifying surface material properties (Doerschner, Fleming et al., 2011). Here we show that specular flow can also affect the perceived rotation axis of objects. In three experiments, we investigate how threedimensional shape and surface material interact to affect the perceived rotation axis of unfamiliar irregularly shaped and isotropic objects. We analyze observers' patterns of errors in a rotation axis estimation task under four surface material conditions: shiny, matte textured, matte untextured, and silhouette. In addition to the expected large perceptual errors in the silhouette condition, we find that the patterns of errors for the other three material conditions differ from each other and across shape category, yielding the largest differences in error magnitude between shiny and matte, textured isotropic objects. Rotation axis estimation is a crucial implicit computational step to perceive structure from motion; therefore, we test whether a structure from a motion-based model can predict the perceived rotation axis for shiny and matte, textured objects. Our model's predictions closely follow observers' data, even yielding the same reflectance-specific perceptual errors. Unlike previous work (Caudek & Domini, 1998), our model does not rely on the assumption of affine image transformations; however, a limitation of our approach is its reliance on projected correspondence, thus having difficulty in accounting for the perceived rotation axis of smooth shaded objects and silhouettes. In general, our findings are in line with earlier research that demonstrated that shape from motion can be extracted based on several different types of optical deformation (Koenderink & Van Doorn, 1976; Norman & Todd, 1994; Norman, Todd, & Orban, 2004; Pollick, Nishida, Koike, & Kawato, 1994; Todd, 1985).
      Keywords
      Material qualities
      Object recognition
      Optic flow
      Rotation axis
      Structure from motion
      Surface reflectance
      Permalink
      http://hdl.handle.net/11693/20744
      Published Version (Please cite this version)
      http://dx.doi.org/10.1167/13.11.8
      Collections
      • Department of Psychology 157
      • National Magnetic Resonance Research Center (UMRAM) 175
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy