Spatial Information Content Analysis of Optical Polarimetric Imagery.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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In this study the spatial information content of optical polarimetric Stokes vector imagery of both synthetic and natural scenes is analyzed. The intent of this study is to evaluate the utility of polarimetric imagery in the extraction of spatial information content from scenes containing spatially correlated features that can be described by their spatial two- dimensional power spectra. This study was conducted in four phases 1 construct an imaging polarimeter system for the purpose of collecting representative imagery containing both synthetic and natural scenes of spatially correlated features illuminated under clear sky conditions 2 process the collected image data to create the Stokes vector images and derivative images 3 construct a polarimetric imaging simulation for the purpose of comparing synthetic data with actual results and 4 analyze both the synthetic and actual Stokes imagery for the purpose of evaluating the spatial information content of the processed scenes. Analysis of the study results produced five main conclusions 1 characteristic curve Co-calibration of the input images is important for the accurate calculation of the Stokes parameters and derivatives 2 the polarimetric difference D image provides a direct measurement of sensitometric co-calibration error 3 the polarization ellipse orientation angle T image histogram can provide an indirect measure of the azimuthal difference between the principal plane and the polarizer reference plane 4 the percent polarization P and orientation angle T components provide more stable estimates of spatial power spectral density PSD compared with the unpolarized intensity I component and 5 the PSD stabilities of the P and T components demonstrate a relative insensitivity to imaging geometry compared with the I component.