Spectral and polarimetric analysis of hyperspectral data collected by an acousto-optic tunable filter system

Abstract

Analysis of data collected during a ground-based experiment of an acousto-optic tunable filter (AOTF) hyperspectral imaging system illustrates the utility of this technology for military applications. The unique ability of an AOTF system to simultaneously acquire two orthogonally polarized images allows both spectral and polarimetric characterization of targets. The data images selected for analysis contain camouflaged military equipment deployed in a desert background. After geometric and atmospheric correction, spectral analysis is accomplished using two different methods. Comparing images created by the difference between polarizations for each band provides the basis for polarimetric analysis of the data. An algorithm developed to combine the information provided by spectral and polarimetric analysis shows how features within a scene can be distinguished from the background. Results show that AOTF hyperspectral technology has potential to enhance current military intelligence collection capabilities