August 2014
Volume 14, Issue 10
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2014
Is the Perception of 3D Shape from Shading Based on Assumed Reflectance and Illumination?
Author Affiliations
  • James Todd
    Department of Psychology, Ohio State University
  • Eric Egan
    Department of Psychology, Ohio State University
Journal of Vision August 2014, Vol.14, 725. doi:10.1167/14.10.725
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      James Todd, Eric Egan; Is the Perception of 3D Shape from Shading Based on Assumed Reflectance and Illumination?. Journal of Vision 2014;14(10):725. doi: 10.1167/14.10.725.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

This research was designed to compare three types of image shading: One generated with a Lambertian BRDF and homogeneous illumination such that image intensity was determined entirely by local surface orientation irrespective of position; one that was textured with a linear intensity gradient, such that image intensity was determined entirely by local surface position irrespective of orientation; and another that was generated with a Lambertian BRDF and inhomogeneous illumination such that image intensity was influenced by both position and orientation. A gauge figure adjustment task was used to measure observers' perceptions of local surface orientation on the depicted surfaces, and the probe points included 60 pairs of regions that both had the same orientation. The results show clearly that observers' perceptions of these three types of stimuli were remarkably similar, and that probe regions with similar apparent orientations could have large differences in image intensity. This latter finding is incompatible with any process for computing shape from shading that assumes any plausible reflectance function combined with any possible homogeneous illumination.

Meeting abstract presented at VSS 2014

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