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1 July 1991 Generation of IR sky background images
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martin P. Levesque "Generation of IR sky background images", Proc. SPIE 1486, Characterization, Propagation, and Simulation of Sources and Backgrounds, (1 July 1991);

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