Enhancement of Target Detection by Polarization Techniques
PAR GOVERNMENT SYSTEMS CORP ROME NY
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The objectives of this effort were to study the dependence of the degree of polarization of reflected light upon scene radiance level, and to study factors controlling the relationship between the polarization of recorded scene radiance and its intensity. A further objective was to extend upon previous work conducted for AFRL to better understand the enhancement of shadow through the use of polarization methods. While constrained by the wide spectral bands of the available sensor, the intent was to work towards finding whether there is a spectral dependence of polarization close to the red edge and blue edge, as well as the center of water absorption bands. This provides the potential to aid in discriminating camouflage nets and camouflaged vehicles, building, and structures from vegetation. Efforts demonstrated that scene radiance controls the degree of polarization in a given bandpass. It does not appear to matter whether the radiance level is controlled by shadow or by albedo nor does it seem to matter for the broad bandpasses used the reflector. The reason to believe that polarization might provide additional information to narrow band reflected radiance hyperspectral information for vegetationcamouflage discrimination and for vegetation stress discrimination.
- Optical Detection and Detectors