Incorporation of angular emissivity effects in long wave infrared image models

Computer Science – Performance

Scientific paper

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Emissivity, Infrared Imagery, Radiance, Radiometers, Target Recognition, Black Body Radiation, Glass Fibers, Metal Sheets, Prediction Analysis Techniques, Steels, Wood

Scientific paper

A radiometric model designed to facilitate target to background image modeling has been developed (c.f. Schott and Biegel 1985). The model was designed to incorporate atmospheric transmission, upwelled and downwelled path radiance and variations in these factors as a function of view angle. The radiometric model has been applied to kinetic temperature image models to simulate long wave infrared image characteristics, including spatial resolution and scale. A limitation of the model as presented to this point has been the lack of empirical data on emissivities of natural objects. This paper includes a description of two devices for measurement of the hemispheric and angular emissivity from large irregular surfaces. Emissivities for selected materials are presented and incorporated into the model. The effect of emissivity on simulated images is discussed. This model is being developed as part of an overall effort to expand long wave infrared image science. The potential for application of the expanded model to sensor performance evaluation and target recognition assessment are discussed.

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