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Proceedings Paper

Ambiguities in shape from underwater image shading
Author(s): Chih-Ho Yu
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Paper Abstract

Shape from shading has been extensively studied in the field of computer vision. Most research in this area assumes a non-attenuating medium, such as air. Generally speaking, the developed methods cannot be directly used for applications in undersea environments where the absorption and scattering of the medium may not be negligible. In this paper, we present an image irradiance model for a Lambertian surface illuminated by a point source in an attenuating medium such as seawater. This model has been used to recover the orientation of uniform planar patches. Our current experimental data show that the developed model also provides a quite accurate approximation of the image brightness of curved surfaces. In this paper, we discuss several ambiguities in the solutions based on this model and compare them with solutions in land-based systems. Our discussion mainly involves case studies of ruled surface which can be reduced to 1-D cases in the computation. The results presented in this paper are useful for image understanding and/or object recognition in underwater applications.

Paper Details

Date Published: 10 October 1994
PDF: 7 pages
Proc. SPIE 2353, Intelligent Robots and Computer Vision XIII: Algorithms and Computer Vision, (10 October 1994); doi: 10.1117/12.188899
Show Author Affiliations
Chih-Ho Yu, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 2353:
Intelligent Robots and Computer Vision XIII: Algorithms and Computer Vision
David P. Casasent, Editor(s)

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