16 June 1997 Nonmechanically steered passive imaging sensors: restoration of dispersion-degraded imagery via Wiener filtering
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Abstract
Nonmechanical steering of passive imaging sensors is possible using liquid-crystal optical phase arrays as dynamic blazed-phase gratings. However, the resulting imagery is degraded due to diffraction effects which produce both multiple orders and dispersion. Restoration of this degraded imagery through post-processing techniques involves estimation of both the spectral radiance of the object within the field of regard of the sensor as well as deconvolution to remove blurring. A method of image restoration via Wiener filtering is presented for the case of an object scene composed of graybodies at various temperatures. Using simulated staring infrared sensor imagery, it is shown that image restoration is possible for small steering angles.
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Kenneth J. Barnard, Kenneth J. Barnard, Edward A. Watson, Edward A. Watson, } "Nonmechanically steered passive imaging sensors: restoration of dispersion-degraded imagery via Wiener filtering", Proc. SPIE 3063, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing VIII, (16 June 1997); doi: 10.1117/12.276062; https://doi.org/10.1117/12.276062
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