Grant R. Gerhart

Abstract: For years, thermal model developers have promoted the approach of using simulated data validated by measurements as the best method of analyzing all aspects of a thermal signature -- target, background, atmosphere, and imager. Recent advances in high speed CPUs and high performance graphic workstations have allowed for improved proficiency in these thermal signature models and has helped convince `the user' that the modeled approach is viable. Now, targets and backgrounds can be modeled more quickly and with better realism and imagers of all types can be simulated in practical runtimes. These improved capabilities increase the temptation to look to modeling as the panacea for all difficulties encountered in infrared imaging as sensor designers, smart weapons designers, and vehicle concept designers all realize the cost and practical limitations of using measured data only. This paper examines the benefits and pitfalls experienced by U.S. Army modelers particularly in the target and background modeling area and provides some guidelines for future modeling directions.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

TL;DR: In this article, a linear phase carrier was introduced to eliminate the ambiguity in holographic fringe interpretation. But the carrier was not used to determine the fringe order at any point without ambiguity.

TL;DR: An imaging sensor simulation model is described which allows a modeled or measured scene radiance map to be displayed on a video monitor as it would be seen if viewed through a simulated sensor under simulated environmental conditions.

TL;DR: In this paper, a comparison between wavelet transforms and the local cosine transform of various types of images was made, and it was shown that wavelet transform gave a more compact representation for certain types of signals and performed as well as wavelet for others.

TL;DR: In this article, the Stokes parameters for each scene pixel along with the degree of polarization, azimuth angle, sign and ellipticity for each of the color components were calculated.