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Proceedings Paper

Modeling of the observed image of an object situated under the sea surface and distorted by surface waves
Author(s): George B. Sochilin; Victor E. Semenov; Nina V. Vyssotina; Nikolay A. Kaliteevskii; Nikolay N. Rosanov; Andrew M. Scott
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Paper Abstract

We propose a method of numerical simulation of an image formation in vision systems looking through the waved water surface. The simulation of radiation propagation through the waved sea surface and sea depth is realized in ray approximation. Waviness is simulated as evolving in the time random surface with given spectrum of elevations and dispersion relation. New values of angular, energy, and polarization parameters of each ray in the beam after its refraction and reflection at a given surface point are calculated by means of Fresnel formulae. Seawater medium is split in the layers with thickness chosen from the condition that water characteristics can be considered as constant and that multiple scattering of a ray can be neglected within a layer. Attenuation of beam energy corresponds to the length of the beam path in the layer, and probability of beam scattering at a random angle within a layer is determined by phase scattering function. We have obtained numerically instantaneous and averaged over different exposition times images of 2D self-luminous and located mira made up from spokes and situated at various depths for various values of wind velocities and seawater scattering coefficients. Influence of water and waviness parameters on the image quality has been analyzed.

Paper Details

Date Published: 28 October 1999
PDF: 11 pages
Proc. SPIE 3761, Airborne and In-Water Underwater Imaging, (28 October 1999); doi: 10.1117/12.366477
Show Author Affiliations
George B. Sochilin, S.I. Vavilov State Optical Institute (Russia)
Victor E. Semenov, S.I. Vavilov State Optical Institute (Russia)
Nina V. Vyssotina, S.I. Vavilov State Optical Institute (Russia)
Nikolay A. Kaliteevskii, S.I. Vavilov State Optical Institute (Russia)
Nikolay N. Rosanov, S.I. Vavilov State Optical Institute (Russia)
Andrew M. Scott, Defence Evaluation and Research Agency Malvern (United Kingdom)

Published in SPIE Proceedings Vol. 3761:
Airborne and In-Water Underwater Imaging
Gary D. Gilbert, Editor(s)

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