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Proceedings Paper

Fine-resolution imagery of extended objects observed through volume turbulence using phase-diverse speckle
Author(s): Brian J. Thelen; David A. Carrara; Richard G. Paxman
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Paper Abstract

Space-variant blur occurs when imaging through volume turbulence over sufficiently large fields of view. This condition arises in a variety of imaging geometries, including astronomical imaging, horizontal-path imaging, and slant-path (e.g. air-to-ground) imaging. Space-variant effects are particularly severe when much of the optical path is immersed in turbulent media. We present a novel post-processing algorithm based on the technique of phase- diverse speckle (PDS) and a physical model for the space- variant blur. PDS imaging is a combination of phase diversity and speckle imaging which has proven to be an effective post-processing technique for cases with space- invariant blur. We present the details of the algorithm modified to accommodate space-variance and demonstrate its performance with results from both simulation experiments and real-data experiments. The results show that the space- variant PDS algorithm is very effective in cases involving severe space-variant blur, which cause correction techniques based on space-invariant models to fail.

Paper Details

Date Published: 5 October 1999
PDF: 10 pages
Proc. SPIE 3763, Propagation and Imaging through the Atmosphere III, (5 October 1999); doi: 10.1117/12.363605
Show Author Affiliations
Brian J. Thelen, ERIM International, Inc. (United States)
David A. Carrara, ERIM International, Inc. (United States)
Richard G. Paxman, ERIM International, Inc. (United States)

Published in SPIE Proceedings Vol. 3763:
Propagation and Imaging through the Atmosphere III
Michael C. Roggemann; Luc R. Bissonnette, Editor(s)

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