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Proceedings Paper

Isophotes on a smooth surface related to scene geometry
Author(s): Pascal Mamassian
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Paper Abstract

It is shown, through elementary differential geometry, how the shape of the isophotes on a smooth surface is related to the underlying object and the location of the light source. Taking advantage of the principal directions, several characteristics of the isophotes are expressed, among which the geodesic curvature is emphasized. From these results, a variational method is discussed to estimate the surface shape from the image irradiance, subject to a geodesicity constraint on the isophotes. Finally, a local solid shape characteristic based on the principal curvatures ratio is offered.

Paper Details

Date Published: 23 June 1993
PDF: 10 pages
Proc. SPIE 2031, Geometric Methods in Computer Vision II, (23 June 1993); doi: 10.1117/12.146619
Show Author Affiliations
Pascal Mamassian, Univ. of Minnesota/Twin Cities (United States)

Published in SPIE Proceedings Vol. 2031:
Geometric Methods in Computer Vision II
Baba C. Vemuri, Editor(s)

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