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Synthèse de paysages dans l'infrarouge thermique pour la simulation d'images de télédétection

Abstract : Companies have already developed simulators of the image acquisition system in the thermal infrared range. Operating these simulators requires the knowledge of numerous parameters, including the landscape to observe. This landscape has to be simulated, a great difficulty because of the complexity of its behaviour. It follows that few simulators of landscapes were developed. This thesis palliates this shortcoming. A method is proposed that simulates images having high spatial resolution in the infrared range. A simulator has been designed and developed. Using a thermal and spectral modelling of the behaviour of the landscape, a classification of the different physical phenomena intervening in the signal was made. A very high accuracy in simulation is obtained by the means of the analysis and the computation of physical phenomena occurring at small scale (heat conduction, wind flow disturbance,...) and in three dimensions (shadows, reflections,...). A fine modelling of such processes is required. The originality of the thesis is the design of a method adapted to the synthesis of image in the infrared range. The method is based on radiosity. The landscape is modelled by the means of elements, that are entities permitting the prediction of the signal coming from the landscape. These elements are consistent with computational resource requirements: computation time and memory performance. They come from the concatenation of all constraints due to the geometry of the objects, their constitution (material), and the impact of the evolution of all physical phenomena in the landscape behaviour. These elements are a volume and temporal extension of facets, entity usually used in image synthesis for shorter wavelengths. Images obtained using such elements and the simulator are presented in the thesis.
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Submitted on : Tuesday, November 5, 2013 - 5:28:35 PM
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  • HAL Id : pastel-00880312, version 1


Thierry Poglio. Synthèse de paysages dans l'infrarouge thermique pour la simulation d'images de télédétection. Océan, Atmosphère. Université de Nice Sophia-Antipolis, 2002. Français. ⟨pastel-00880312⟩



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