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Proceedings Paper

Wavelet-based SAR speckle reduction and image compression
Author(s): Jan Erik Odegard; Haitao Guo; Markus Lang; C. Sidney Burrus; Raymond O. Wells Jr.; Leslie M. Novak; Margarita Hiett
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Paper Abstract

This paper evaluates the performance of the recently published wavelet-based algorithm for speckle reduction of SAR images. The original algorithm, based on the theory of wavelet thresholding due to Donoho and Johnstone, has been shown to improve speckle statistics. In this paper, we give more extensive results based on tests performed at Lincoln Laboratory (LL). The LL benchmarks show that the SAR imagery is significantly enhanced perceptually. Although the wavelet processed data results in an increase in the number of natural clutter false alarms, an appropriately modified CFAR detector (i.e., by clamping the estimated clutter standard deviation) eliminates the extra false alarms. The paper also gives preliminary results on the performance of the new and improved wavelet denoising algorithm based on the shift invariant wavelet transform. By thresholding the shift invariant discrete wavelet transform we can further reduce speckle to achieve a perceptually superior SAR image with ground truth information significantly enhanced. Preliminary results on the speckle statistics of this new algorithm is improved over the classical wavelet denoising algorithm. Finally, we show that the classical denoising algorithm as proposed by Donoho and Johnstone and applied to SAR has the added benefit of achieving about 3:1 compression with essentially no loss in image fidelity.

Paper Details

Date Published: 5 June 1995
PDF: 13 pages
Proc. SPIE 2487, Algorithms for Synthetic Aperture Radar Imagery II, (5 June 1995); doi: 10.1117/12.210843
Show Author Affiliations
Jan Erik Odegard, Rice Univ. (United States)
Haitao Guo, Rice Univ. (United States)
Markus Lang, Rice Univ. (United States)
C. Sidney Burrus, Rice Univ. (United States)
Raymond O. Wells Jr., Rice Univ. (United States)
Leslie M. Novak, MIT Lincoln Lab. (United States)
Margarita Hiett, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 2487:
Algorithms for Synthetic Aperture Radar Imagery II
Dominick A. Giglio, Editor(s)

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