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Publications de G. Poggi
Résultat de la recherche dans la liste des publications :
Article |
1 - Supervised Segmentation of Remote Sensing Images Based on a Tree-Structure MRF Model.
G. Poggi et G. Scarpa et J. Zerubia. IEEE Trans. Geoscience and Remote Sensing, 43(8): pages 1901-1911, août 2005.
Mots-clés : Classification, Segmentation, Champs de Markov.
@ARTICLE{ieeetgrs_05,
|
| author |
= |
{Poggi, G. and Scarpa, G. and Zerubia, J.}, |
| title |
= |
{Supervised Segmentation of Remote Sensing Images Based on a Tree-Structure MRF Model}, |
| year |
= |
{2005}, |
| month |
= |
{août}, |
| journal |
= |
{IEEE Trans. Geoscience and Remote Sensing}, |
| volume |
= |
{43}, |
| number |
= |
{8}, |
| pages |
= |
{1901-1911}, |
| pdf |
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{http://ieeexplore.ieee.org/iel5/36/32001/01487647.pdf?tp=&arnumber=1487647&isnumber=32001}, |
| keyword |
= |
{Classification, Segmentation, Champs de Markov} |
| } |
|
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3 Articles de conférence |
1 - Morphological road segmentation in urban areas from high resolution satellite images.
R. Gaetano et J. Zerubia et G. Scarpa et G. Poggi. Dans International Conference on Digital Signal Processing, Corfu, Greece, juillet 2011.
Mots-clés : Segmentation, Classification, skeletonization , pattern recognition, shape analysis.
@INPROCEEDINGS{GaetanoDSP,
|
| author |
= |
{Gaetano, R. and Zerubia, J. and Scarpa, G. and Poggi, G.}, |
| title |
= |
{Morphological road segmentation in urban areas from high resolution satellite images}, |
| year |
= |
{2011}, |
| month |
= |
{juillet}, |
| booktitle |
= |
{International Conference on Digital Signal Processing}, |
| address |
= |
{Corfu, Greece}, |
| url |
= |
{http://hal.inria.fr/inria-00618222/fr/}, |
| keyword |
= |
{Segmentation, Classification, skeletonization , pattern recognition, shape analysis} |
| } |
Abstract :
High resolution satellite images provided by the last generation
sensors significantly increased the potential of almost
all the image information mining (IIM) applications related
to earth observation. This is especially true for the extraction
of road information, task of primary interest for many remote
sensing applications, which scope is more and more extended
to complex urban scenarios thanks to the availability of highly
detailed images. This context is particularly challenging due
to such factors as the variability of road visual appearence
and the occlusions from entities like trees, cars and shadows.
On the other hand, the peculiar geometry and morphology of
man-made structures, particularly relevant in urban areas, is
enhanced in high resolution images, making this kind of information
especially useful for road detection.
In this work, we provide a new insight on the use of morphological
image analysis for road extraction in complex urban
scenarios, and propose a technique for road segmentation
that only relies on this domain. The keypoint of the technique
is the use of skeletons as powerful descriptors for road objects:
the proposed method is based on an ad-hoc skeletonization
procedure that enhances the linear structure of road segments,
and extracts road objects by first detecting their skeletons
and then associating each of them with a region of the
image. Experimental results are presented on two different
high resolution satellite images of urban areas. |
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2 - Unsupervised Hierarchical Image Segmentation based on the TS-MRF model and Fast Mean-Shift Clustering.
R. Gaetano et G. Scarpa et G. Poggi et J. Zerubia. Dans Proc. European Signal Processing Conference (EUSIPCO), Lausanne, Switzerland, août 2008.
Mots-clés : Segmentation, Markov Random Fields, Mean Shift, Land Classification.
@INPROCEEDINGS{Gaetano2008,
|
| author |
= |
{Gaetano, R. and Scarpa, G. and Poggi, G. and Zerubia, J.}, |
| title |
= |
{Unsupervised Hierarchical Image Segmentation based on the TS-MRF model and Fast Mean-Shift Clustering}, |
| year |
= |
{2008}, |
| month |
= |
{août}, |
| booktitle |
= |
{Proc. European Signal Processing Conference (EUSIPCO)}, |
| address |
= |
{Lausanne, Switzerland}, |
| pdf |
= |
{http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=7080521}, |
| keyword |
= |
{Segmentation, Markov Random Fields, Mean Shift, Land Classification} |
| } |
Abstract :
Tree-Structured Markov Random Field (TS-MRF) models have been recently proposed to provide a hierarchical multiscale description of images. Based on such a model, the unsupervised image segmentation is carried out by means of a sequence of nested class splits, where each class is modeled as a local binary MRF.
We propose here a new TS-MRF unsupervised segmentation technique which improves upon the original algorithm by selecting a better tree structure and eliminating spurious classes. Such results are obtained by using the Mean-Shift procedure to estimate the number of pdf modes at each node (thus allowing for a non-binary tree), and to obtain a more reliable initial clustering for subsequent MRF optimization. To this end, we devise a new reliable and fast clustering algorithm based on the Mean-Shift technique. Experimental results prove the potential of the proposed method. |
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3 - Segmentation of remote sensing images by supervised TS-MRF.
G. Poggi et G. Scarpa et J. Zerubia. Dans Proc. IEEE International Conference on Image Processing (ICIP), Singapore, octobre 2004.
@INPROCEEDINGS{poggi_icip04,
|
| author |
= |
{Poggi, G. and Scarpa, G. and Zerubia, J.}, |
| title |
= |
{Segmentation of remote sensing images by supervised TS-MRF}, |
| year |
= |
{2004}, |
| month |
= |
{octobre}, |
| booktitle |
= |
{Proc. IEEE International Conference on Image Processing (ICIP)}, |
| address |
= |
{Singapore}, |
| url |
= |
{http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1421441}, |
| keyword |
= |
{} |
| } |
|
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Rapport de recherche et Rapport technique |
1 - A Binary Tree-Structured MRF Model for Multispectral Satellite Image Segmentation.
G. Scarpa et G. Poggi et J. Zerubia. Rapport de Recherche 5062, INRIA, France, décembre 2003.
Mots-clés : Estimation bayesienne, Classification, Champs de Markov, Modeles hierarchiques.
@TECHREPORT{Scarpa03,
|
| author |
= |
{Scarpa, G. and Poggi, G. and Zerubia, J.}, |
| title |
= |
{A Binary Tree-Structured MRF Model for Multispectral Satellite Image Segmentation}, |
| year |
= |
{2003}, |
| month |
= |
{décembre}, |
| institution |
= |
{INRIA}, |
| type |
= |
{Research Report}, |
| number |
= |
{5062}, |
| address |
= |
{France}, |
| url |
= |
{https://hal.inria.fr/inria-00071522}, |
| pdf |
= |
{https://hal.inria.fr/file/index/docid/71522/filename/RR-5062.pdf}, |
| ps |
= |
{https://hal.inria.fr/docs/00/07/15/22/PS/RR-5062.ps}, |
| keyword |
= |
{Estimation bayesienne, Classification, Champs de Markov, Modeles hierarchiques} |
| } |
Résumé :
Dans ce rapport, nous proposons un modèle markovien a priori structuré à arbre binaire (le TS-MRF) pour la segmentation d'images satellitaires multispectrales. Ce modèle permet de représenter un champ bidimensionnel par une séquence de champs de Markov binaires, chacun correspondant à un noeud de l'arbre. Pour avoir une bonne classification, on peut adapter le modèle TS-MRF à la structure intrinsèque des données, en définissant un MRF, à plusieurs paramètres, très flexible. Bien que l'on définisse le modèle global sur tout l'arbre, l'optimisation et l'estimation peuvent être poursuivis en considérant un noeud à la fois, à partir de la racine jusqu'aux feuilles, avec une réduction significative de la complexité. En effet, on a montré expérimentalement que l'algorithme global est beaucoup plus rapide qu'un algorithme conventionnel fondé sur le modèle markovien d'Ising, en particulier quand le nombre des bandes spectrales est très grand. Grâce à la procédure d'optimisation séquentielle, ce modèle permet aussi de déterminer le nombre des classes présentes dans l'image satellitaire, dans le cadre d'une classification non supervisée, à travers une condition d'arrêt définie localement pour chaque noeud. Nous avons effectué des expériences sur une image SPOT de la baie de Lannion, pour laquelle nous disposons d'une vérité terrain, et nous avons trouvé que le modèle proposé fournit de meilleurs résultats que certains autres modèles de Markov et que d'autres méthodes variationnelles. |
Abstract :
In this work we detail a tree-structured MRF (TS-MRF) prior model useful for segmentation of multispectral satellite images. This model allows a hierarchical representation of a 2-D field by the use of a sequence of binary MRFs, each corresponding to a node in the tree. In order to get good performances, one can fit the intrinsic structure of the data to the TS-MRF model, thereby defining a multi-parameter, flexible, MRF. Although a global MRF model is defined on the whole tree, optimization as well estimation can be carried out by working on a single node at a time, from the root down to the leaves, with a significant reduction in complexity. Indeed the overall algorithm is proved experimentally to be much faster than a comparable algorithm based on a conventional Ising MRF model, especially when the number of bands becomes very large. Thanks to the sequential optimization procedure, this model also addresses the cluster validation problem of unsupervised segmentation, through the use of a stopping condition local to each node. Experiments on a SPOT image of the Lannion Bay, a ground-truth of which is available, prove the superior performance of the algorithm w.r.t. some other MRF based algorithms for supervised segmentation, as well as w.r.t. some variational methods. |
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