Records |
Author |
Enric Marti |
Title |
Análisis de elementos gráficos en documentos |
Type |
Report |
Year |
1996 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
9 |
Pages |
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Abstract |
En este texto se presenta un estudio sobre las t’ecnicas y aplicaciones de an’alisis de documentos, y más concretamente abordando la problem’atica del an’alisis de de entidades gr’aficas. El ’area de an’alisis de documentos tiene como objetivo la interpretaci’on de documentos impresos sobre papel por m’etodos computacionales, para obtener una descripci’on con un alto nivel de abstracci’on, que permita su posterior tratamiento y archivo por m’etodos inform’aticos. Este objetivo, junto a los trabajos realizados hasta el momento, le otorgan a esta ’area un amplio ’ambito de aplicaciones para la manipulaci’on y archivo de documentos sobre papel, que puede llegar a significar un salto cualitativo importante (del papel al disco ’optico) en el uso de soportes de informaci’on, debido a las importantes prestaciones de acceso y capacidad de archivo que suponen los medios inform’aticos. Generalmente los documentos son introducidos en los sistemas de an’alisis de documentos mediante scanner, obt... |
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Computer Vision Centre |
Place of Publication |
CVC UAB |
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IAM; |
Approved |
no |
Call Number |
IAM @ iam @ Mar1996 |
Serial |
1587 |
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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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CVC (UAB) |
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MILAB;IAM |
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no |
Call Number |
IAM @ iam @ RHM1996 |
Serial |
1631 |
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Author |
Antonio Lopez; Felipe Lumbreras; Joan Serrat |
Title |
Efficient computation of local creaseness |
Type |
Report |
Year |
1997 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
15 |
Pages |
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Place of Publication |
CVC, Bellaterra (Spain) |
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ADAS |
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no |
Call Number |
ADAS @ adas @ LLS1997b |
Serial |
527 |
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Author |
Debora Gil |
Title |
Regularized Curvature Flow |
Type |
Report |
Year |
2002 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
63 |
Pages |
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Computer Vision Centre |
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IAM; |
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no |
Call Number |
IAM @ iam @ Gil2002 |
Serial |
1518 |
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Author |
Debora Gil; Petia Radeva |
Title |
Curvature based Distance Maps |
Type |
Report |
Year |
2003 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
70 |
Pages |
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Publisher |
Computer Vision Center |
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Notes |
IAM;MILAB |
Approved |
no |
Call Number |
IAM @ iam @ GIR2003a |
Serial |
1534 |
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Author |
Jaume Garcia |
Title |
Generalized Active Shape Models Applied to Cardiac Function Analysis |
Type |
Report |
Year |
2004 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
78 |
Pages |
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Keywords |
Cardiac Analysis; Deformable Models; Active Contour Models; Active Shape Models; Tagged MRI; HARP; Contrast Echocardiography. |
Abstract |
Medical imaging is very useful in the assessment and treatment of many diseases. To deal with the great amount of data provided by imaging scanners and extract quantitative information that physicians can interpret, many analysis algorithms have been developed. Any process of analysis always consists of a first step of segmenting some particular structure. In medical imaging, structures are not always well defined and suffer from noise artifacts thus, ordinary segmentation methods are not well suited. The ones that seem to give better results are those based on deformable models. Nevertheless, despite their capability of mixing image features together with smoothness constraints that may compensate for image irregularities, these are naturally local methods, i. e., each node of the active contour evolve taking into account information about its neighbors and some other weak constraints about flexibility and smoothness, but not about the global shape that they should find. Due to the fact that structures to be segmented are the same for all cases but with some inter and intra-patient variation, the incorporation of a priori knowledge about shape in the segmentation method will provide robustness to it. Active Shape Models is an algorithm based on the creation of a shape model called Point Distribution Model. It performs a segmentation using only shapes similar than those previously learned from a training set that capture most of the variation presented by the structure. This algorithm works by updating shape nodes along a normal segment which often can be too restrictive. For this reason we propose a generalization of this algorithm that we call Generalized Active Shape Models and fully integrates the a priori knowledge given by the Point Distribution Model with deformable models or any other appropriate segmentation method. Two different applications to cardiac imaging of this generalized method are developed and promising results are shown. |
Address |
CVC (UAB) |
Corporate Author |
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Thesis |
Master's thesis |
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Notes |
IAM; |
Approved |
no |
Call Number |
IAM @ iam @ Gar2004 |
Serial |
1513 |
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Author |
Aura Hernandez-Sabate |
Title |
Automatic adventitia segmentation in IntraVascular UltraSound images |
Type |
Report |
Year |
2005 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
85 |
Pages |
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Keywords |
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Abstract |
A usual tool in cardiac disease diagnosis is vessel plaque assessment by analysis of IVUS sequences. Manual detection of lumen-intima, intima-media and media-adventitia vessel borders is the main activity of physicians in the process of plaque quantification. Large variety in vessel border descriptors, as well as, shades, artifacts and blurred response due to ultrasound physical properties troubles automated media-adventitia segmentation. This experimental work presents a solution to such a complex problem. The process blends advanced anisotropic filtering operators and statistic classification techniques, achieving an efficient vessel border modelling strategy. First of all, we introduce the theoretic base of the method. After that, we show the steps of the algorithm, validating the method with statistics that show that the media-adventitia border detection achieves an accuracy in the range of inter-observer variability regardless of plaque nature, vessel geometry and incomplete vessel borders. Finally, we present a little Matlab application to the automatic media-adventitia border. |
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Corporate Author |
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Thesis |
Master's thesis |
Publisher |
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Place of Publication |
08193 Bellaterra, Barcelona (Spain) |
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Notes |
IAM; |
Approved |
no |
Call Number |
IAM @ iam @ Her2005 |
Serial |
1544 |
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Author |
Aura Hernandez-Sabate; Debora Gil; Petia Radeva |
Title |
A Deterministic-Statistical Strategy for Adventitia Segmentation in IVUS images |
Type |
Report |
Year |
2005 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
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Issue |
89 |
Pages |
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Keywords |
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Abstract |
A useful tool for some specific studies in cardiac disease diagnosis is vessel plaque assessment by analysis of IVUS sequences. Manual detection of luminal (inner) and media-adventitia (external) vessel borders is the main activity of physicians in the process of lumen narrowing (plaque) quantification. Difficult definition of vessel border descriptors, as well as, shades, artifacts and blurred signal response due to ultrasound physical properties troubles automated adventitia segmentation. In order to efficiently approach such a complex problem, we propose blending advanced anisotropic filtering operators and statistical classification techniques into a vessel border modelling strategy. Our systematic statistical analysis shows that the reported adventitia detection achieves an accuracy in the range of inter-observer variability regardless of plaque nature, vessel geometry and incomplete vessel borders. |
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Notes |
IAM; MILAB |
Approved |
no |
Call Number |
IAM @ iam @ HGR2005a |
Serial |
1548 |
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Author |
David Vazquez; David Geronimo; Antonio Lopez |
Title |
The effect of the distance in pedestrian detection |
Type |
Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
149 |
Issue |
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Pages |
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Keywords |
Pedestrian Detection |
Abstract |
Pedestrian accidents are one of the leading preventable causes of death. In order to reduce the number of accidents, in the last decade the pedestrian protection systems have been introduced, a special type of advanced driver assistance systems, in witch an on-board camera explores the road ahead for possible collisions with pedestrians in order to warn the driver or perform braking actions. As a result of the variability of the appearance, pose and size, pedestrian detection is a very challenging task. So many techniques, models and features have been proposed to solve the problem. As the appearance of pedestrians varies signicantly as a function of distance, a system based on multiple classiers specialized on diferent depths is likely to improve the overall performance with respect to a typical system based on a general detector. Accordingly, the main aim of this work is to explore the eect of the distance in pedestrian detection. We have evaluated three pedestrian detectors (HOG, HAAR and EOH) in two dierent databases (INRIA and Daimler09) for two dierent sizes (small and big). By a extensive set of experiments we answer to questions like which datasets and evaluation methods are the most adequate, which is the best method for each size of the pedestrians and why or how do the method optimum parameters vary with respect to the distance |
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Master's thesis |
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M.Sc. |
Notes |
ADAS |
Approved |
no |
Call Number |
ADAS @ adas @ VGL2009 |
Serial |
1669 |
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Author |
Albert Andaluz |
Title |
LV Contour Segmentation in TMR images using Semantic Description of Tissue and Prior Knowledge Correction |
Type |
Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
142 |
Issue |
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Pages |
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Keywords |
Active Contour Models; Snakes; Active Shape Models; Deformable Templates; Left Ventricle Segmentation; Generalized Orthogonal Procrustes Analysis; Harmonic Phase Flow; Principal Component Analysis; Tagged Magnetic Resonance |
Abstract |
The Diagnosis of Left Ventricle (LV) pathologies is related to regional wall motion analysis. Health indicator scores such as the rotation and the torsion are useful for the diagnose of the Left Ventricle (LV) function. However, this requires proper identification of LV segments. On one hand, manual segmentation is robust, but it is slow and requires medical expertise. On the other hand, the tag pattern in Tagged Magnetic Resonance (TMR) sequences is a problem for the automatic segmentation of the LV boundaries. Consequently, we propose a method based in the classical formulation of parametric Snakes, combined with Active Shape models. Our semantic definition of the LV is tagged tissue that experiences motion in the systolic cycle. This defines two energy potentials for the Snake convergence. Additionally, the mean shape corrects excessive deviation from the anatomical shape. We have validated our approach in 15 healthy volunteers and two short axis cuts. In this way, we have compared the automatic segmentations to manual shapes outlined by medical experts. Also, we have explored the accuracy of clinical scores computed using automatic contours. The results show minor divergence in the approximation and the manual segmentations as well as robust computation of clinical scores in all cases. From this we conclude that the proposed method is a promising support tool for clinical analysis. |
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Master's thesis |
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Place of Publication |
Bellaterra 08193, Barcelona, Spain |
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IAM; |
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no |
Call Number |
IAM @ iam @ And2009 |
Serial |
1667 |
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Author |
Mohammad Rouhani |
Title |
3D Data Fitting and Tracking for Real Time Applications |
Type |
Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
138 |
Issue |
138 |
Pages |
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Abstract |
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Address |
Barcelona, Spain |
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Thesis |
Master's thesis |
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invisible;ADAS |
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no |
Call Number |
Admin @ si @ Rou2009 |
Serial |
1150 |
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Author |
Hany Salah Eldeen |
Title |
Colour Naming in Context through a Perceptual Model |
Type |
Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
130 |
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Corporate Author |
Computer Vision Center |
Thesis |
Master's thesis |
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Place of Publication |
Bellaterra, Barcelona |
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no |
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Admin @ si @ Eld2009 |
Serial |
2389 |
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Author |
Naila Murray |
Title |
Perceptual Feature Detection |
Type |
Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
131 |
Issue |
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Corporate Author |
Computer Vision Center |
Thesis |
Master's thesis |
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Place of Publication |
Bellaterra, Barcelona |
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CIC |
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no |
Call Number |
Admin @ si @ Mur2009 |
Serial |
2390 |
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Author |
Josep M. Gonfaus |
Title |
Semantic Segmentation of Images Using Random Ferns |
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Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
132 |
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Computer Vision Center |
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Master's thesis |
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Bellaterra, Barcelona |
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ISE |
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no |
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Admin @ si @ Gon2009 |
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2391 |
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Author |
Albert Gordo |
Title |
A Cyclic Page Layout Descriptor for Document Classification & Retrieval |
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Report |
Year |
2009 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
128 |
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Computer Vision Center |
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Master's thesis |
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Bellaterra, Barcelona |
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CIC;DAG |
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no |
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Admin @ si @ Gor2009 |
Serial |
2387 |
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