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Proceedings Paper

Diffuse illumination as a default assumption for shape-from-shading in the absence of shadows
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Paper Abstract

Radial sinusoids (blurry spoke patterns) appear dramatically saturated toward the brighter regions. The saturation is not perceptually logarithmic but exhibits a hyperbolic (Naka- Rushton) compression behavior at normal indoor luminance levels. The object interpretation of the spoke patterns was not consistent with the default assumption of any unidirectional light source, but implied a diffuse illumination (as if the object were looming out of a fog). The depth interpretation was consistent with the hypothesis that the compressed brightness profile provided the neural signal for perceived shape, as an approximation to computing the diffuse Lambertian illumination function for this surface. The surface material of the images was perceived as non-Lambertian to varying degrees, ranging from a chalky matte to a lustrous metallic.

Paper Details

Date Published: 3 June 1997
PDF: 6 pages
Proc. SPIE 3016, Human Vision and Electronic Imaging II, (3 June 1997); doi: 10.1117/12.274530
Show Author Affiliations
Christopher W. Tyler, Smith-Kettlewell Eye Research Institute (United States)

Published in SPIE Proceedings Vol. 3016:
Human Vision and Electronic Imaging II
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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