IEEE Geoscience and Remote Sensing Magazine - September 2013 - 15

Another fact that should be considered when a pdf
model is chosen is the computational cost. Some combinations of estimation criterion and pdf model yield a Bayesian
estimator that can be achieved only numerically [45]. This
fact may prevent from using the filter when huge amounts
of data need to be processed. In this case, a closed form
solution may be preferred, even though a possible loss of
performances may be experienced.
IV. A REVIEW OF DESPECKLING METHODS
A multitude of despeckling filters can be obtained by
combining the different domains of estimation (spa-

tial, homomorphic, wavelet, homomorphic-wavelet),
the estimation criteria, e.g., MMSE, LMMSE, minimum
mean absolute error (MMAE), MAP or non-Bayesian,
and the pdf models. A nonexhaustive review and classification of methods is attempted in the following of
this section.
A. BAyesiAn methods in spAtiAl domAin
Early works on despeckling were deployed in the spatial
domain and were obtained by making assumptions on the
statistical properties of reflectivity and speckle, e.g., pdf
and autocorrelation function.

(a)

(b)

(c)

(d)

FIGuRE 6. Examples of the application of Bayesian estimators in the UDWT domain: (a) original 5-look ERS-2 image and filtered versions

obtained with, (b) Lee refined filter [49], (c) refined C-MAP filter [56], and (d) Rational Laplacian Pyramid filter [59].
September 2013

ieee Geoscience and remote sensing magazine

15



Table of Contents for the Digital Edition of IEEE Geoscience and Remote Sensing Magazine - September 2013

IEEE Geoscience and Remote Sensing Magazine - September 2013 - Cover1
IEEE Geoscience and Remote Sensing Magazine - September 2013 - Cover2
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 1
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 2
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 3
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 4
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 5
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 6
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 7
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 8
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 9
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 10
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 11
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 12
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 13
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 14
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 15
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 16
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 17
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 18
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 19
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 20
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 21
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 22
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 23
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 24
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 25
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 26
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 27
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 28
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 29
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 30
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 31
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 32
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 33
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 34
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 35
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 36
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 37
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 38
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 39
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 40
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 41
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 42
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 43
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 44
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 45
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 46
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 47
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 48
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 49
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 50
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 51
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 52
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 53
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 54
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 55
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 56
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 57
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 58
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 59
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 60
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 61
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 62
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 63
IEEE Geoscience and Remote Sensing Magazine - September 2013 - 64
IEEE Geoscience and Remote Sensing Magazine - September 2013 - Cover3
IEEE Geoscience and Remote Sensing Magazine - September 2013 - Cover4
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2023
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2023
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2023
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2023
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2022
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2022
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2022
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2022
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2021
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2021
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2021
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2021
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2020
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2020
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2020
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2020
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2019
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2019
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2019
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2019
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2018
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2018
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2018
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2018
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2017
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2017
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2017
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2017
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2016
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2016
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2016
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2016
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2015
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2015
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2015
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2015
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2014
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2014
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2014
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2014
https://www.nxtbook.com/nxtbooks/ieee/geoscience_december2013
https://www.nxtbook.com/nxtbooks/ieee/geoscience_september2013
https://www.nxtbook.com/nxtbooks/ieee/geoscience_june2013
https://www.nxtbook.com/nxtbooks/ieee/geoscience_march2013
https://www.nxtbookmedia.com