Three-dimensional longwave infrared synthetic image generation incorporating angular emissivity effects using ray-tracing techniques

Eric H. Shor; Carl Salvaggio; John R. Schott

doi:10.1117/12.23080

1 November 1990 Three-dimensional longwave infrared synthetic image generation incorporating angular emissivity effects using ray-tracing techniques

Eric H. Shor, Carl Salvaggio, John R. Schott

Author Affiliations +

Proceedings Volume 1341, Infrared Technology XVI; (1990) https://doi.org/10.1117/12.23080
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

A technique for longwave infrared (LWIR) synthetic image generation is shown which yields improved radiometric accuracy in the 8-14 micron bandpass. This process uses a modified LOWTRAN 6 atmospheric transmission/upwelled radiance code and computer graphics ray-tracing techniques. A scene is created by placing faceted objects into world coordinates with rotation, translation, and scaling parameters. Each facet is assigned a material index and temperature. The material index points to optical properties for that material. The modified LOWTRAN 6 code incorporates sensor response function when computing tables of the atmospheric transmission and upwelled and downwelled radiances. A ray-traced image is then generated. A final synthetic LWIR scene is generated to geometrically match an actual acquired scene so that radiometric comparisons can be made.

Citation Download Citation

Eric H. Shor, Carl Salvaggio, and John R. Schott "Three-dimensional longwave infrared synthetic image generation incorporating angular emissivity effects using ray-tracing techniques", Proc. SPIE 1341, Infrared Technology XVI, (1 November 1990); https://doi.org/10.1117/12.23080

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