IEEE Geoscience and Remote Sensing Magazine - June 2021 - 29
Deep Learning
Methods for Synthetic
Aperture Radar Image
Despeckling
An overview of trends and perspectives
GIULIA FRACASTORO, ENRICO MAGLI, GIOVANNI POGGI, GIUSEPPE SCARPA,
DIEGO VALSESIA, AND LUISA VERDOLIVA
S
ynthetic aperture radar (SAR) images
are affected by a spatially correlated
and signal-dependent noise called speckle,
which is very severe and may hinder
image exploitation. Despeckling is an
important task that aims to remove such
noise so as to improve the accuracy of
all downstream image processing tasks.
The first despeckling methods date back
to the 1970s, and several model-based
algorithms have been developed in the
years since. The field has received growing
attention, sparked by the availability
of powerful deep learning models that
have yielded excellent performance for
inverse problems in image processing.
This article surveys the literature on
deep learning methods applied to SAR
despeckling, covering both supervised
and the more recent self-supervised
approaches. We provide a critical analysis
of existing methods, with the objective
of recognizing the most promising
research lines; identify the factors that
have limited the success of deep models;
and propose ways forward in an
attempt to fully exploit the potential
of deep learning for SAR despeckling.
Digital Object Identifier 10.1109/MGRS.2021.3070956
Date of current version: 27 April 2021
JUNE 2021 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE
©SHUTTERSTOCK.COM/ASVMAGZ
0274-6638/21©2021IEEE
29
http://www.SHUTTERSTOCK.COM/ASVMAGZ
IEEE Geoscience and Remote Sensing Magazine - June 2021
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