| Records |
| Author |
Oriol Pujol; Debora Gil; Petia Radeva |
| Title |
Fundamentals of Stop and Go active models |
Type |
Journal Article |
| Year |
2005 |
Publication |
Image and Vision Computing |
Abbreviated Journal |
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| Volume |
23 |
Issue |
8 |
Pages |
681-691 |
| Keywords |
Deformable models; Geodesic snakes; Region-based segmentation |
| Abstract |
An efficient snake formulation should conform to the idea of picking the smoothest curve among all the shapes approximating an object of interest. In current geodesic snakes, the regularizing curvature also affects the convergence stage, hindering the latter at concave regions. In the present work, we make use of characteristic functions to define a novel geodesic formulation that decouples regularity and convergence. This term decoupling endows the snake with higher adaptability to non-convex shapes. Convergence is ensured by splitting the definition of the external force into an attractive vector field and a repulsive one. In our paper, we propose to use likelihood maps as approximation of characteristic functions of object appearance. The better efficiency and accuracy of our decoupled scheme are illustrated in the particular case of feature space-based segmentation. |
| Address |
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| Corporate Author |
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Thesis  |
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| Publisher |
Butterworth-Heinemann |
Place of Publication |
Newton, MA, USA |
Editor |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0262-8856 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
IAM;MILAB;HuPBA |
Approved |
no |
| Call Number |
IAM @ iam @ PGR2005 |
Serial |
1629 |
| Permanent link to this record |
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| Author |
Petia Radeva; A.Amini; J.Huang; Enric Marti |
| Title |
Deformable B-Solids and Implicit Snakes for Localization and Tracking of SPAMM MRI-Data |
Type |
Conference Article |
| Year |
1996 |
Publication |
Workshop on Mathematical Methods in Biomedical Image Analysis |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
192-201 |
| Keywords |
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| Abstract |
To date, MRI-SPAMM data from different image slices have been analyzed independently. In this paper, we propose an approach for 3D tag localization and tracking of SPAMM data by a novel deformable B-solid. The solid is defined in terms of a 3D tensor product B-spline. The isoparametric curves of the B-spline solid have special importance. These are termed implicit snakes as they deform under image forces from tag lines in different image slices. The localization and tracking of tag lines is performed under constraints of continuity and smoothness of the B-solid. The framework unifies the problems of localization, and displacement fitting and interpolation into the same procedure utilizing B-spline bases for interpolation. To track motion from boundaries and restrict image forces to the myocardium, a volumetric model is employed as a pair of coupled endocardial and epicardial B-spline surfaces. To recover deformations in the LV an energy-minimization problem is posed where both tag and ... |
| Address |
San Francisco CA |
| Corporate Author |
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Thesis |
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| Publisher |
IEEE Computer Society |
Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
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ISBN |
0-8186-7368-0 |
Medium |
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| Area |
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Expedition |
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Conference |
MMBIA ’96 |
| Notes |
MILAB;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ RAH1996 |
Serial |
1630 |
| Permanent link to this record |
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| |
| Author |
Petia Radeva; Amir Amini; Jintao Huang; Enric Marti |
| Title |
Deformable B-Solids: application for localization and tracking of MRI-SPAMM data |
Type |
Report |
| Year |
1996 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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| Volume |
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Issue |
8 |
Pages |
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| Keywords |
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| Abstract |
To date, MRI-SPAMM data from different image slices have been analyzed independently. In this paper, we propose an approach for 3D tag localization and tracking of SPAMM data by a novel deformable B-solid. The solid is defined in terms of a 3D tensor product B-spline. The isoparametric curves of the B-spline solid have special importance. These are termed implicit snakes as they deform under image forces from tag lines in different image slices. The localization and tracking of tag lines is performed under constraints of continuity and smoothness of the B-solid. The framework unifies the problems of localization, and displacement fitting and interpolation into the same procedure utilizing B-spline bases for interpolation. To track motion from boundaries and restrict image forces to the myocardium, a volumetric model is employed as a pair of coupled endocardial and epicardial B-spline surfaces. To recover deformations in the LV an energy-minimization problem is posed where both tag and ... |
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Thesis |
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| Publisher |
CVC (UAB) |
Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ RHM1996 |
Serial |
1631 |
| Permanent link to this record |
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| |
| Author |
Petia Radeva; Enric Marti |
| Title |
An improved model of snakes for model-based segmentation |
Type |
Conference Article |
| Year |
1995 |
Publication |
Proceedings of Computer Analysis of Images and Patterns |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
515-520 |
| Keywords |
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| Abstract |
The main advantage of segmentation by snakes consists in its ability to incorporate smoothness constraints on the detected shapes that can occur. Likewise, we propose to model snakes with other properties that reflect the information provided about the object of interest in a different extent. We consider different kinds of snakes, those searching for contours with a certain direction, those preserving an object’s model, those seeking for symmetry, those expanding open, etc. The availability of such a collection of snakes allows not only the more complete use of the knowledge about the segmented object, but also to solve some problems of the existing snakes. Our experiments on segmentation of facial features justify the usefulness of snakes with different properties. |
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Place of Publication |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
CAIP |
| Notes |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ RaM1995b |
Serial |
1632 |
| Permanent link to this record |
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| |
| Author |
Petia Radeva; Enric Marti |
| Title |
Facial Features Segmentation by Model-Based Snakes |
Type |
Conference Article |
| Year |
1995 |
Publication |
International Conference on Computing Analysis and Image Processing |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
Deformable models have recently been accepted as a standard technique to segment different features in facial images. Despite they give a good approximation of the salient features in a facial image, the resulting shapes of the segmentation process seem somewhat artificial with respect to the natural feature shapes. In this paper we show that active contour models (in particular, rubber snakes) give more close and natural representation of the detected feature shape. Besides, using snakes for facial segmentation frees us from the problem of determination of the numerous weigths of deformable models. Another advantage of rubber snakes is their reduced computational cost. Our experiments using rubber snakes for segmentation of facial snapshots have shown a significant improvement compared to deformable models. |
| Address |
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| Corporate Author |
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Thesis |
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| Publisher |
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Place of Publication |
Bellaterra (Barcelona), Spain |
Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ RAM1995a |
Serial |
1633 |
| Permanent link to this record |
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| Author |
Petia Radeva; Joan Serrat; Enric Marti |
| Title |
A snake for model-based segmentation |
Type |
Conference Article |
| Year |
1995 |
Publication |
Proc. Conf. Fifth Int Computer Vision |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
816-821 |
| Keywords |
snakes; elastic matching; model-based segmenta tion |
| Abstract |
Despite the promising results of numerous applications, the hitherto proposed snake techniques share some common problems: snake attraction by spurious edge points, snake degeneration (shrinking and attening), convergence and stability of the deformation process, snake initialization and local determination of the parameters of elasticity. We argue here that these problems can be solved only when all the snake aspects are considered. The snakes proposed here implement a new potential eld and external force in order to provide a deformation convergence, attraction by both near and far edges as well as snake behaviour selective according to the edge orientation. Furthermore, we conclude that in the case of model-based seg mentation, the internal force should include structural information about the expected snake shape. Experiments using this kind of snakes for segmenting bones in complex hand radiographs show a signi cant improvement. |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
MILAB;ADAS;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ RSM1995 |
Serial |
1634 |
| Permanent link to this record |
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| Author |
Oriol Rodriguez-Leon.A.Carol;H.Tizon; Eduard Fernandez-Nofrerias; Josefina Mauri; Vicente del Valle; Debora Gil; Aura Hernandez-Sabate; Petia Radeva |
| Title |
Model estadístic-determinístic per la segmentació de l adventicia en imatges d ecografía intracoronaria |
Type |
Journal Article |
| Year |
2005 |
Publication |
Rev Societat Catalana Cardiologia |
Abbreviated Journal |
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| Volume |
5 |
Issue |
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Pages |
41 |
| Keywords |
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| Abstract |
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| Address |
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Place of Publication |
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Editor |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RCT2005 |
Serial |
1637 |
| Permanent link to this record |
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| Author |
Oriol Rodriguez-Leon; Josefina Mauri; Eduard Fernandez-Nofrerias; M.Gomez; Antonio Tovar; L.Cano; C.Diego; Carme Julia; Vicente del Valle; Debora Gil; Petia Radeva |
| Title |
Ecografia Intracoronària: Segmentació Automàtica de area de la llum |
Type |
Conference Article |
| Year |
2002 |
Publication |
XXXVIII Congreso Nacional de la Sociedad Española de Cardiología. |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
IAM;ADAS;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RMF2002 |
Serial |
1638 |
| Permanent link to this record |
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| Author |
Oriol Rodriguez-Leon; Debora Gil; Eduard Fernandez-Nofrerias; H.Tizon; S.Montserrat; Vicente del Valle;Josefina Mauri |
| Title |
Caracterització de la Perfusió Miocàrdica mitjançant anàlisi estadístic de l espectre en l angiografia de contrast |
Type |
Conference Article |
| Year |
2007 |
Publication |
XIX Congrés de la Societat Catalana de Cardiologia de Barcelona |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
130 |
| Keywords |
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| Abstract |
La valoració de la integritat de la microcirculació coronària aporta informació pronòstica en pacients amb infart agut de miocardi en els que es realitza angioplastia primària. Aquesta valoració és subjectiva i presenta una important variabilitat si no es duta a terme per personal experimentat. Presentem una eina d’anàlisi d’imatge que permet fer una valoració de la microcirculació coronària a partir de seqüències d’angiografia. Hem analitzat les variacions locals en el nivell de gris de la imatge durant la seqüència angiogràfica. Hem identificat els principals fenòmens observats (respiració, batec cardíac, tinció arterial, tinció miocàrdica i soroll radiològic) mitjançant un anàlisi estadístic de l’espectre de Fourier de l’evolució al llarg del temps de la mitja local. Aquest mateix anàlisis permet determinat la influència de cadascun d’ells en la extracció del patró de tinció i selecciona la respiració com el fenomen que més distorsiona el patró de tinció original. Els descriptors proposats s’obtenen fora del rang espectral respiratori. Hem testat la seva capacitat per a detectar els tres fenòmens principals (tinció miocàrdica (MS), tinció arterial (AS) i soroll (NS)) independentment de la respiració. La capacitat de discriminació dels descriptors ha estat valorada mitjançant un mètode de crossvalidation en 30 seqüències d’angiografia. Els descriptors emprats permeten caracteritzar la tinció miocàrdica amb una alta eficiència i fiabilitat. A més no hi ha diferències significatives en l’anàlisi de les seqüències obtingudes amb el pacient respirant amb normalitat o en apnea |
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Place of Publication |
Barcelona (Spain) |
Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
IAM |
Approved |
no |
| Call Number |
IAM @ iam @ RGF2007 |
Serial |
1639 |
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| Author |
Oriol Rodriguez-Leon; Debora Gil; Eduard Fernandez-Nofrerias |
| Title |
Analisis en los cambios en el nivel de gris en las secuencias angiograficas mediante descriptores estadisticos para determinar la perfusion miocardica |
Type |
Journal Article |
| Year |
2006 |
Publication |
Revista Española de Cardiología |
Abbreviated Journal |
REC |
| Volume |
59 Supl 2-166 |
Issue |
2 |
Pages |
128 |
| Keywords |
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| Abstract |
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Place of Publication |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ RGF2006 |
Serial |
1640 |
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| Author |
Oriol Rodriguez-Leon; Josefina Mauri;Eduard Fernandez-Nofrerias; C.Garcia; R.Villuendas; Vicente del Valle; Debora Gil;Petia Radeva |
| Title |
Reconstruction of a spatio-temporal model of the intima layer from intravascular ultrasound sequences |
Type |
Journal Article |
| Year |
2003 |
Publication |
European Heart Journal |
Abbreviated Journal |
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Issue |
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Pages |
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Place of Publication |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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Expedition |
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Conference |
ESC Congress |
| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RMF2003c |
Serial |
1641 |
| Permanent link to this record |
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| Author |
Oriol Rodriguez-Leon; Josefina Mauri;Eduard Fernandez-Nofrerias; Antonio Tovar; Vicente del Valle; Aura Hernandez-Sabate; Debora Gil; Petia Radeva |
| Title |
Utilización de la Estructura de los Campos Vectoriales para la Detección de la Adventicia en Imágenes de Ecografía Intracoronaria |
Type |
Journal Article |
| Year |
2004 |
Publication |
Revista Internacional de Enfermedades Cardiovasculares Revista Española de Cardiología |
Abbreviated Journal |
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| Volume |
57 |
Issue |
2 |
Pages |
100 |
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Edition |
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Medium |
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Expedition |
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Conference |
SEC |
| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RMF2004 |
Serial |
1642 |
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| Author |
Oriol Rodriguez-Leon; Eduard Fernandez-Nofrerias; Josefina Mauri; Vicente del Valle; Debora Gil; A.Barrios; E.Garcia; Petia Radeva |
| Title |
Perfusion ratio: A new tool to objectively assess microcirculation perfusion after primary Percutaneous Coronary Intervention |
Type |
Conference Article |
| Year |
2006 |
Publication |
World Congress of Cardiology |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
859 |
| Keywords |
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| Abstract |
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| Address |
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Thesis |
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| Publisher |
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Place of Publication |
Barcelona (Spain) |
Editor |
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Summary Language |
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Original Title |
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Series Title |
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Series Issue |
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Edition |
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Medium |
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Expedition |
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Conference |
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| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RFM2006c |
Serial |
1643 |
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| Author |
Oriol Rodriguez-Leon; Josefina Mauri; Eduard Fernandez-Nofrerias; Vicente de Valle; E.Garcia; A.Barrios; Debora Gil; Petia Radeva |
| Title |
Analysis of the changes in angiography local grey-level values to determine myocardial perfusion |
Type |
Conference Article |
| Year |
2006 |
Publication |
World Congress of Cardiology |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
862 |
| Keywords |
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| Abstract |
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| Address |
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Thesis |
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| Publisher |
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Place of Publication |
Barcelona (Spain) |
Editor |
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| Language |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RMF2006 |
Serial |
1644 |
| Permanent link to this record |
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| Author |
Misael Rosales; Petia Radeva; Oriol Rodriguez; Debora Gil |
| Title |
Suppression of IVUS Image Rotation. A Kinematic Approach |
Type |
Book Chapter |
| Year |
2005 |
Publication |
Functional Imaging and Modeling of the Heart |
Abbreviated Journal |
LNCS |
| Volume |
3504 |
Issue |
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Pages |
889-892 |
| Keywords |
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| Abstract |
IntraVascular Ultrasound (IVUS) is an exploratory technique used in interventional procedures that shows cross section images of arteries and provides qualitative information about the causes and severity of the arterial lumen narrowing. Cross section analysis as well as visualization of plaque extension in a vessel segment during the catheter imaging pullback are the technique main advantages. However, IVUS sequence exhibits a periodic rotation artifact that makes difficult the longitudinal lesion inspection and hinders any segmentation algorithm. In this paper we propose a new kinematic method to estimate and remove the image rotation of IVUS images sequences. Results on several IVUS sequences show good results and prompt some of the clinical applications to vessel dynamics study, and relation to vessel pathology. |
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| Publisher |
Springer Berlin / Heidelberg |
Place of Publication |
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Editor |
Frangi, Alejandro and Radeva, Petia and Santos, Andres and Hernandez, Monica |
| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
Lecture Notes in Computer Science |
Abbreviated Series Title |
LNCS |
| Series Volume |
3504 |
Series Issue |
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Edition |
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| ISSN |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
IAM;MILAB |
Approved |
no |
| Call Number |
IAM @ iam @ RRR2005 |
Serial |
1645 |
| Permanent link to this record |
