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RESEARCH
Main achievements of the project
Results obtained in 2008 are mainly linked to
contractual research, notably associated to CNES
projects. This means continuing our research into
detection of heterogeneous change and two paths
were studied.
Change indicators from statistical
measure
Studies were based on optimisation of the
Kullback-Leibler divergence in the detection of
change between two radar images (a first
publication appeared in 2008 on this subject). An
extension was proposed using a sparse
representation yielding a better decorrelation of
samples which were distributed into a more
Gaussian distribution than in the initial space.
Divergence estimation is more accurate and the
result of change measure is more regular.
Joint processing of heterogeneous data
This axis was first developed in a parametric form
with the copula theory (a first publication
appeared in 2008 in collaboration with the
University of Genoa). It has been developed also
from a non-parametric point of view. A Kohonen
map in a non-parametric, supervised context with
the aim of drawing up a "transfer function"
between the heterogeneous observations. Change
detection was carried out thanks to an
appropriated definition of the neurones into the
Kohonen map. A new non-parametric (but nonsupervised)
formulation is under development
and allows to process homogeneous and
heterogeneous data indifferently, but also to
handle bi-date or multi-date detection. This latter
formulation is based on joint sparse
representation of images.
Publications
Articles in peer-review journals
[1] Bassam Abdel Latif, Rémi Lecerf, Grégoire Mercier, Laurence
Hubert-Moy. Preprocessing of low-resolution time series
contaminated by clouds and shadows. IEEE transactions on
geoscience and remote sensing, july 2008, vol. 46, n° 7, pp. 2083-
2096
[2] Abdourrahmane Mahamane Atto, Dominique Pastor, Grégoire
Mercier. Detection thresholds for non-parametric estimation.
Signal, image and video processing, 2008, vol. 2, n° 3, pp. 207-223
[3] Imed Riadh Farah, Wadii Boulila, Karim Saheb Ettabaa, Mohamed
Ben Hamed. Multiapproach system based on fusion of multispectral
images for land-cover classification. IEEE transactions on
geoscience and remote sensing, december 2008, vol. 46, n° 12, pp.
4153-4161
[4] Imed Riadh Farah, Wadii Boulila, Karim Saheb Ettabaa, Basel
Solaiman, Mohamed Ben Hamed. Interpretation of multisensor
remote sensing images : multiapproach fusion of uncertain
information. IEEE transactions on geoscience and remote sensing,
december 2008, vol. 46, n° 12, pp. 4142-4152
[5] Imed Riadh Farah, Wassim Messaoudi, Karim Saheb Ettabaa,
Basel Solaiman. Satellite image retrieval based on ontology
merging. International journal on graphics, vision and image
processing, july 2008, vol. 08, n° 2, pp. 45-53
[6] Grégoire Mercier, Gabriele Moser, Sebastiono Serpico.
Conditional copulas for change detection in heterogeneous remote
sensing images. IEEE transactions on geoscience and remote
sensing, may 2008, vol. 46, n° 5, pp. 1428-1441
[7] Karim Saheb Ettabaa, Imed Riadh Farah, Basel Solaiman,
Mohamed Ben Ahmed. Toward a multi-temporal approach for
satellite image interpretation. International arab journal of
information technology (IAJIT), july 2008, vol. 5, n° 3, pp. 281-287
Thesis
[8] Bassam Abdel Latif. Traitement des séries temporelles avec la
carte Kohonen. Th. doct. : traitement du signal et télécommunications:
Institut Télécom ; Télécom Bretagne : 2008, 2008telb0087.
128 p.
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