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

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

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1341...68s&link_type=abstract

IN: Infrared technology XVI; Proceedings of the Meeting, San Diego, CA, July 11-13, 1990 (A92-21426 07-35). Bellingham, WA, Soci

Computer Science

Graphics

Computer Graphics, Image Processing, Infrared Radiometers, Ray Tracing, Computer Aided Design, Emissivity, Far Infrared Radiation, Target Recognition, Three Dimensional Models

Scientific paper

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.

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