The Wavelet Digest Homepage
Return to the homepage
Search the complete Wavelet Digest database
Help about the Wavelet Digest mailing list
About the Wavelet Digest
The Digest The Community
 Latest Issue  Back Issues  Events  Gallery
The Wavelet Digest
   -> Volume 5, Issue 3

Preprint: Speckle Noise Reduction with Symmetric Daubechies Wavelets
images/spacer.gifimages/spacer.gif Reply into Digest
Previous :: Next  
Author Message (Langis Gagnon)

PostPosted: Wed Dec 04, 2002 9:51 am    
Subject: Preprint: Speckle Noise Reduction with Symmetric Daubechies Wavelets
Reply with quote

Preprint: Speckle Noise Reduction with Symmetric Daubechies Wavelets

Hi everyone,

For those of you that are interested in noise reduction using wavelets,
here is a new paper available upon request to Langis Gagnon
(see email address below).

Speckle Noise Reduction of Airborne SAR Images with Symmetric
Daubechies Wavelets

Langis Gagnon, R&D Department, LORAL Canada Inc., 6111
Ave. Royalmount, Montreal (Quebec), H4P 1K6, CANADA

Fatima Drissi Smaili, Departement de Mathematiques, Universite
de Montreal, C.P. 6128 Succ. Centre-Ville, Montreal (Quebec),

We report the study of a multiresolution speckle reduction
method for airborne Synthetic Aperture Radar (SAR) images.
The SAR image is subband-coded using Symmetric Daubechies (SD)
wavelets followed by a noise estimate on the three high-pass
bands. An elliptic wavelet coefficient thresholding rule
(based on a principal component analysis) is applied, that
preserves the global orientation of the complex wavelet
coefficient distributions. Tests are performed on commercial
airborne SAR images of uniform regions as well as on small dim
objects. A speckle index is computed to quantify the noise
reduction performance. We compare our results with those
obtained using median and geometrical (Crimmins) filters.

SPIE Proceedings # 2759, "Signal and Data Processing of Small
Targets"Orlando, 1996

Langis Gagnon phone: (514)-340-8715
R&D Department FAX: (514)-340-8318
LORAL Canada Inc. email:
6111, Ave. Royalmount WEB:
Montreal (Quebec) H4P 1K6 CANADA
All times are GMT + 1 Hour
Page 1 of 1

Jump to: 

disclaimer -
Powered by phpBB

This page was created in 0.026891 seconds : 18 queries executed : GZIP compression disabled