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The Offset-Compensated Nonlocal Filtering of Interferometric Phase

Sica, Francescopaolo and Cozzolino, Davide and Verdoliva, Luisa and Poggi, Giovanni (2018) The Offset-Compensated Nonlocal Filtering of Interferometric Phase. Remote Sensing, 10 (9). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs10091359. ISSN 2072-4292.

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Official URL: http://www.mdpi.com/2072-4292/10/9/1359


The nonlocal approach, proposed originally for additive white Gaussian noise image filtering, has rapidly gained popularity in many applicative fields and for a large variety of tasks. It has proven especially successful for the restoration of Synthetic Aperture Radar (SAR) images: single-look and multi-look amplitude images, multi-temporal stacks, polarimetric data. Recently, powerful nonlocal filters have been proposed also for Interferometric SAR (InSAR) data, with excellent results. Nonetheless, a severe decay of performance has been observed in regions characterized by a uniform phase gradient, which are relatively common in InSAR images, as they correspond to constant slope terrains. This inconvenience is ultimately due to the rare patch effect, the lack of suitable predictors for the target patch. In this paper, to address this problem, we propose the use of offset-compensated similarity measures in nonlocal filtering. With this approach, the set of candidate predictors is augmented by including patches that differ from the target only for a constant phase offset, which is automatically estimated and compensated. We develop offset-compensated Versions of both basic nonlocal means and InSAR-Block-Matching 3D (BM3D), a state-of-the-art InSAR Phase filter. Experiments on simulated images and real-world TanDEM-X SAR interferometric pairs prove the effectiveness of the proposed method.

Item URL in elib:https://elib.dlr.de/121489/
Document Type:Article
Title:The Offset-Compensated Nonlocal Filtering of Interferometric Phase
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sica, FrancescopaoloUNSPECIFIEDhttps://orcid.org/0000-0003-1593-1492UNSPECIFIED
Date:27 August 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:synthetic aperture radar (SAR); SAR interferometry (InSAR); nonlocal filtering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Projekt TanDEM-X (old), R - SAR methods
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Deposited By: Sica, Dr. Francescopaolo
Deposited On:03 Sep 2018 13:34
Last Modified:14 Dec 2019 04:26

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