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Shape-from-shading for matte and glossy objects.

Harold T Nefs1, Jan J Koenderink, Astrid M L Kappers

  • 1Universiteit Utrecht/Helmholtz Instituut, Department of Physics of Man, Utrecht, The Netherlands. harold.nefs@st-andrews.ac.uk

Acta Psychologica
|September 27, 2005
PubMed
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This study investigated how surface gloss affects perceived shape. Surprisingly, changing illumination direction impacted shape perception, but object glossiness did not, despite visual differences.

Area of Science:

  • Visual Perception
  • Computer Graphics
  • Psychophysics

Background:

  • Surface appearance, including glossiness and texture, significantly influences how we perceive 3D shapes.
  • Specular highlights, reflections on glossy surfaces, can alter the perceived shape of objects.

Purpose of the Study:

  • To determine if specular highlights on objects influence perceived surface relief.
  • To investigate the role of glossiness in shape perception.

Main Methods:

  • Six convex objects were rendered with either matte or glossy surfaces under two different illumination conditions.
  • Two experimental paradigms were used: surface attitude probing and contour tracing.
  • Observers' judgments of perceived surface relief were recorded.

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Main Results:

  • Changing the direction of illumination significantly affected perceived surface relief in both experimental tasks.
  • No systematic differences in perceived surface relief were found between matte and glossy objects.
  • Despite visual differences, glossiness did not influence the perception of surface shape.

Conclusions:

  • Illumination direction is a critical factor in shape-from-shading perception.
  • Object glossiness does not appear to influence the perception of surface relief, contrary to expectations.
  • Visual cues like specular highlights may not play a significant role in perceived shape despite altering surface appearance.