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

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Title: Three-dimensional longwave infrared synthetic image generation incorporating angular emissivity effects using ray-tracing techniques
Author: Shor, Eric; Salvaggio, Carl; Schott, John
Abstract: A technique for longwave infrared (LWIR) synthetic image generation (510) is shown which yields improved radiomeiric accuracy in the 8-14 .tm 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.
Description: "Three-dimensional longwave infrared (LWIR) synthetic image generation incorporating angular emissivity effects using ray-tracing techniques," Proceedings of the SPIE, Infrared Technology XVI, Vol. 1341. The International Society for Optical Engineering (SPIE). Held in San Diego, California: July 1990. This paper is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Record URI: http://hdl.handle.net/1850/4043
Date: 1990-07

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