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Proceedings Paper

Generation of IR sky background images
Author(s): Martin P. Levesque
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Paper Abstract

A model for generating synthetic images of clouds, in the IR and the visible bands, has been developed in order to obtain sky background images for various atmospheric conditions. The model is based on fractals, radiometry, ray-tracing techniques, and atmospheric propagation. The cloud reliefs are generated (using a fractal-based technique) in multiple window planes defined by the cloud statistics (ceiling, thickness, density, etc.). After that, for each cloud, each radiance component (self-emitted radiance, reflected sun and ground or sea radiation, transmitted radiance, etc.) is calculated separately and summed with the other radiance components. The final image is calculated by propagating each cloud plane through the atmosphere (using interpolation of LOWTRAN data) and through the successive cloud planes up to the observer. Not only is an image of the sky generated, but the known 3-D scene makes it possible to introduce objects at any location in the scene. The model has been programmed and tested and the results show the validity of this approach.

Paper Details

Date Published: 1 July 1991
PDF: 10 pages
Proc. SPIE 1486, Characterization, Propagation, and Simulation of Sources and Backgrounds, (1 July 1991); doi: 10.1117/12.45762
Show Author Affiliations
Martin P. Levesque, Defence Research Establishment Valcartier (Canada)

Published in SPIE Proceedings Vol. 1486:
Characterization, Propagation, and Simulation of Sources and Backgrounds
Wendell R. Watkins; Dieter Clement, Editor(s)

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