GENERATION OF IR SKY BACKGROUND IMAGES (paper presented at the Characterization, Propagation, and Simulation of Sources and Backgrounds Conference, Orlando, Florida, 2 - 3 April 1991)

Authors
  1. Levesque, M.P.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
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 fractal, radiometry, ray-tracing techniques and the 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 an image of the sky is generated, but the known 3-D scene makes it possible to introduce objects at any location in the scene. TRUNCATED
Date of publication
15 Apr 1991
Number of Pages
10
Reprinted from
Proceedings of SPIE - The International Society for Optical Engineering, vol 1486, 1991, p 200-209
DSTKIM No
92-03441
CANDIS No
125879
Format(s):
Hardcopy;Originator's fiche received by DSIS

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