Incorporation of time-dependent thermodynamic models and radiation propagation models into IR 3-D synthetic image generation models

Details Incorporation of time-dependent thermodynamic models and radiation propagation models into IR 3-D synthetic image generation models Incorporation of time-dependent thermodynamic models and radiation propagation models into IR 3-D synthetic image generation models

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1540..533s&link_type=abstract

Proc. SPIE Vol. 1540, p. 533-549, Infrared Technology XVII, Bjorn F. Andresen; Marija S. Scholl; Irving J. Spiro; Eds.

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A model is presented for generation of synthetic images representing what an airborne or satellite thermal infrared imaging sensor would record. The scene and the atmosphere are modeled spectrally with final bandwidth determined by integration over the spectral bandwidth of the sensor (the model will function from 0.25 - 20 micrometers ). The scene is created using a computer aided design package to create objects, assign attributes to facets, and assemble the scene. Object temperatures are computer using a thermodynamic model incorporating 24 hours worth of meteorological history, as well as pixel specific solar load (i.e., self-shadowing is fully supported). The radiance reaching the sensor is computed using a ray tracer and atmospheric propagation models that vary with wavelength and slant range. Objects can be modeled as specular or diffuse with emissivities (reflectivities) dependent on look angle and wavelength. The resulting images mimic the phenomenology commonly observed by high resolution thermal infrared sensors to a point where the model can be used as a research tool to evaluate the limitations in our understanding of the thermal infrared imaging process.

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