On the definition and recognition of planar shapes in digital images

Musé, Pablo

Supervisor(es): Morel, Jean-Michel

Resumen:

This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, partial occlusion, noise, perspective distortion. The atours of such a representation,called shape elements, provide semi local descriptions of shapes. Matching shape elements enables the recognition of "partial shapes" : Then, "global shapes" are defined as groups of partial shapes showing some spatial coherence. Deriving unsupervised thresholds involved in all decision levels of the shape recognition process, is the central points of this work. We propose decision rules for both the correspondence problem of partial shapes, and for the detection of global shapes. The proposed framework is based on a general detection methodology asserting that meaningful events may be viewed as exceptions to randomness.


Cette thèse traite de la reconnaissance des formes dans les images numériques. Une représentation appropriée des formes est déduite de l'analyse des perturbations qui n'affectent pas la reconnaissance : changement de contraste, occlusion partielle, bruit, perspective. Les atomes de cette représentation, appelés "éléments de forme", fournissent des descriptions semi-locales des formes. L'appariement de ces éléments permet de reconnaitre des formes partielles. Les formes globales sont alors définies comme des groupes de formes partielles présentant une cohérence dans leur disposition spatiale. L'aspect fondamental de ce travail est la mise en place de seuils non-supervisés, à tous les niveaux de décision du processus de reconnaissance. Nous proposons des règles de décision pour la en correcpondance de formes partielles ainsi que pour la détection de formes globales. Le cadre proposé est basé sur une méthodologie générale de la détection dans laquelle un événement est significatif s'il n'est pas susceptible d'arriver par hasard.


Detalles Bibliográficos
2004
Inglés
Universidad de la República
COLIBRI
http://hdl.handle.net/20.500.12008/20206
Acceso abierto
Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC - By-NC-ND)
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author Musé, Pablo
author_facet Musé, Pablo
author_role author
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dc.creator.advisor.none.fl_str_mv Morel, Jean-Michel
dc.creator.none.fl_str_mv Musé, Pablo
dc.date.accessioned.none.fl_str_mv 2019-02-21T20:56:45Z
dc.date.available.none.fl_str_mv 2019-02-21T20:56:45Z
dc.date.issued.es.fl_str_mv 2004
dc.date.submitted.es.fl_str_mv 20190221
dc.description.abstract.none.fl_txt_mv This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, partial occlusion, noise, perspective distortion. The atours of such a representation,called shape elements, provide semi local descriptions of shapes. Matching shape elements enables the recognition of "partial shapes" : Then, "global shapes" are defined as groups of partial shapes showing some spatial coherence. Deriving unsupervised thresholds involved in all decision levels of the shape recognition process, is the central points of this work. We propose decision rules for both the correspondence problem of partial shapes, and for the detection of global shapes. The proposed framework is based on a general detection methodology asserting that meaningful events may be viewed as exceptions to randomness.
Cette thèse traite de la reconnaissance des formes dans les images numériques. Une représentation appropriée des formes est déduite de l'analyse des perturbations qui n'affectent pas la reconnaissance : changement de contraste, occlusion partielle, bruit, perspective. Les atomes de cette représentation, appelés "éléments de forme", fournissent des descriptions semi-locales des formes. L'appariement de ces éléments permet de reconnaitre des formes partielles. Les formes globales sont alors définies comme des groupes de formes partielles présentant une cohérence dans leur disposition spatiale. L'aspect fondamental de ce travail est la mise en place de seuils non-supervisés, à tous les niveaux de décision du processus de reconnaissance. Nous proposons des règles de décision pour la en correcpondance de formes partielles ainsi que pour la détection de formes globales. Le cadre proposé est basé sur une méthodologie générale de la détection dans laquelle un événement est significatif s'il n'est pas susceptible d'arriver par hasard.
dc.identifier.citation.es.fl_str_mv MUSÉ, P. "On the definition and recognition of planar shapes in digital images". Tesis de doctorado, École Normale Supérieure de Cachan (France), 2004.
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/20.500.12008/20206
dc.language.iso.none.fl_str_mv en
eng
dc.publisher.es.fl_str_mv École Normale Supérieure de Cachan
dc.rights.license.none.fl_str_mv Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC - By-NC-ND)
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
dc.source.none.fl_str_mv reponame:COLIBRI
instname:Universidad de la República
instacron:Universidad de la República
dc.title.none.fl_str_mv On the definition and recognition of planar shapes in digital images
dc.type.es.fl_str_mv Tesis de doctorado
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
dc.type.version.none.fl_str_mv info:eu-repo/semantics/acceptedVersion
description This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, partial occlusion, noise, perspective distortion. The atours of such a representation,called shape elements, provide semi local descriptions of shapes. Matching shape elements enables the recognition of "partial shapes" : Then, "global shapes" are defined as groups of partial shapes showing some spatial coherence. Deriving unsupervised thresholds involved in all decision levels of the shape recognition process, is the central points of this work. We propose decision rules for both the correspondence problem of partial shapes, and for the detection of global shapes. The proposed framework is based on a general detection methodology asserting that meaningful events may be viewed as exceptions to randomness.
eu_rights_str_mv openAccess
format doctoralThesis
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identifier_str_mv MUSÉ, P. "On the definition and recognition of planar shapes in digital images". Tesis de doctorado, École Normale Supérieure de Cachan (France), 2004.
instacron_str Universidad de la República
institution Universidad de la República
instname_str Universidad de la República
language eng
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publishDate 2004
reponame_str COLIBRI
repository.mail.fl_str_mv mabel.seroubian@seciu.edu.uy
repository.name.fl_str_mv COLIBRI - Universidad de la República
repository_id_str 4771
rights_invalid_str_mv Licencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC - By-NC-ND)
spelling 2019-02-21T20:56:45Z2019-02-21T20:56:45Z200420190221MUSÉ, P. "On the definition and recognition of planar shapes in digital images". Tesis de doctorado, École Normale Supérieure de Cachan (France), 2004.http://hdl.handle.net/20.500.12008/20206This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, partial occlusion, noise, perspective distortion. The atours of such a representation,called shape elements, provide semi local descriptions of shapes. Matching shape elements enables the recognition of "partial shapes" : Then, "global shapes" are defined as groups of partial shapes showing some spatial coherence. Deriving unsupervised thresholds involved in all decision levels of the shape recognition process, is the central points of this work. We propose decision rules for both the correspondence problem of partial shapes, and for the detection of global shapes. The proposed framework is based on a general detection methodology asserting that meaningful events may be viewed as exceptions to randomness.Cette thèse traite de la reconnaissance des formes dans les images numériques. Une représentation appropriée des formes est déduite de l'analyse des perturbations qui n'affectent pas la reconnaissance : changement de contraste, occlusion partielle, bruit, perspective. Les atomes de cette représentation, appelés "éléments de forme", fournissent des descriptions semi-locales des formes. L'appariement de ces éléments permet de reconnaitre des formes partielles. Les formes globales sont alors définies comme des groupes de formes partielles présentant une cohérence dans leur disposition spatiale. L'aspect fondamental de ce travail est la mise en place de seuils non-supervisés, à tous les niveaux de décision du processus de reconnaissance. Nous proposons des règles de décision pour la en correcpondance de formes partielles ainsi que pour la détection de formes globales. Le cadre proposé est basé sur une méthodologie générale de la détection dans laquelle un événement est significatif s'il n'est pas susceptible d'arriver par hasard.Made available in DSpace on 2019-02-21T20:56:45Z (GMT). No. of bitstreams: 4 license_text: 21936 bytes, checksum: 9833653f73f7853880c94a6fead477b1 (MD5) license_url: 49 bytes, checksum: 4afdbb8c545fd630ea7db775da747b2f (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) license.txt: 4194 bytes, checksum: 7f2e2c17ef6585de66da58d1bfa8b5e1 (MD5) Previous issue date: 2004enengÉcole Normale Supérieure de CachanLas obras depositadas en el Repositorio se rigen por la Ordenanza de los Derechos de la Propiedad Intelectual de la Universidad De La República. (Res. Nº 91 de C.D.C. de 8/III/1994 – D.O. 7/IV/1994) y por la Ordenanza del Repositorio Abierto de la Universidad de la República (Res. Nº 16 de C.D.C. de 07/10/2014)info:eu-repo/semantics/openAccessLicencia Creative Commons Atribución – No Comercial – Sin Derivadas (CC - By-NC-ND)On the definition and recognition of planar shapes in digital imagesTesis de doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/acceptedVersionreponame:COLIBRIinstname:Universidad de la Repúblicainstacron:Universidad de la RepúblicaMusé, PabloMorel, Jean-MichelÉcole Normale Supérieure de Cachan (France)Docteur en Mathématiques 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- Universidad de la Repúblicafalse
spellingShingle On the definition and recognition of planar shapes in digital images
Musé, Pablo
status_str acceptedVersion
title On the definition and recognition of planar shapes in digital images
title_full On the definition and recognition of planar shapes in digital images
title_fullStr On the definition and recognition of planar shapes in digital images
title_full_unstemmed On the definition and recognition of planar shapes in digital images
title_short On the definition and recognition of planar shapes in digital images
title_sort On the definition and recognition of planar shapes in digital images
url http://hdl.handle.net/20.500.12008/20206