| Records |
Author  |
Debora Gil; Jaume Garcia; Manuel Vazquez; Ruth Aris; Guillaume Houzeaux |
| Title |
Patient-Sensitive Anatomic and Functional 3D Model of the Left Ventricle Function |
Type |
Conference Article |
| Year |
2008 |
Publication |
8th World Congress on Computational Mechanichs (WCCM8)/5th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2008) |
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Left Ventricle; Electromechanical Models; Image Processing; Magnetic Resonance. |
| Abstract |
Early diagnosis and accurate treatment of Left Ventricle (LV) dysfunction significantly increases the patient survival. Impairment of LV contractility due to cardiovascular diseases is reflected in its motion patterns. Recent advances in medical imaging, such as Magnetic Resonance (MR), have encouraged research on 3D simulation and modelling of the LV dynamics. Most of the existing 3D models consider just the gross anatomy of the LV and restore a truncated ellipse which deforms along the cardiac cycle. The contraction mechanics of any muscle strongly depends on the spatial orientation of its muscular fibers since the motion that the muscle undergoes mainly takes place along the fibers. It follows that such simplified models do not allow evaluation of the heart electro-mechanical function and coupling, which has recently risen as the key point for understanding the LV functionality . In order to thoroughly understand the LV mechanics it is necessary to consider the complete anatomy of the LV given by the orientation of the myocardial fibres in 3D space as described by Torrent Guasp. We propose developing a 3D patient-sensitive model of the LV integrating, for the first time, the ven- tricular band anatomy (fibers orientation), the LV gross anatomy and its functionality. Such model will represent the LV function as a natural consequence of its own ventricular band anatomy. This might be decisive in restoring a proper LV contraction in patients undergoing pace marker treatment. The LV function is defined as soon as the propagation of the contractile electromechanical pulse has been modelled. In our experiments we have used the wave equation for the propagation of the electric pulse. The electromechanical wave moves on the myocardial surface and should have a conductivity tensor oriented along the muscular fibers. Thus, whatever mathematical model for electric pulse propa- gation [4] we consider, the complete anatomy of the LV should be extracted. The LV gross anatomy is obtained by processing multi slice MR images recorded for each patient. Information about the myocardial fibers distribution can only be extracted by Diffusion Tensor Imag- ing (DTI), which can not provide in vivo information for each patient. As a first approach, we have computed an average model of fibers from several DTI studies of canine hearts. This rough anatomy is the input for our electro-mechanical propagation model simulating LV dynamics. The average fiber orientation is updated until the simulated LV motion agrees with the experimental evidence provided by the LV motion observed in tagged MR (TMR) sequences. Experimental LV motion is recovered by applying image processing, differential geometry and interpolation techniques to 2D TMR slices [5]. The pipeline in figure 1 outlines the interaction between simulations and experimental data leading to our patient-tailored model. |
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Venezia (Italia) |
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B-31470-08 |
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IAM |
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IAM @ iam @ GGV2008c |
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1521 |
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| Author |
David Vazquez; Antonio Lopez |
| Title |
Intrusion Classification in Intelligent Video Surveillance Systems |
Type |
Report |
| Year |
2008 |
Publication |
Estudis d'Enginyeria Superior en Informática |
Abbreviated Journal |
UAB |
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| Keywords |
Human detection; Car detection; Intrusion detection |
| Abstract |
An intelligent video surveillance system (IVS) is a camera-based installation able to process in real-time the images coming from the cameras. The aim is to automatically warn about different events of interest at the moment they happen. Daview system of Davantis is a com mercial example of IVS system. The problems addressed by any IVS system, and so Daview, are so challenging that none IVS system is perfect, thus, they need continuous improvement. Accordingly, this project aims to study different approaches in order to outperform current Daview performance, in particular, we bet for improving its classification core. We present an in deep study of the state of the art on IVS systems, as well as on how Daview works. Based on that knowledge, we propose four possibilities for improving Daview classification capabilities: improve existent classifiers; improve existing classifiers combination; create new classifiers and create new classifier-based architectures. Our main contribution has been the incorporation of state-of-the-art feature selection and machine learning techniques for the classification tasks, a viewpoint not fully addressed in current Daview system. After a comprehensive quantitative evaluation we will see how one of our proposals clearly outperforms the overall performance of current Daview system. In particular the classification core that we finally propose consists in an AdaBoost One-Against-All architecture that uses appearance and motion features that were already present in current Daview system |
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Bellaterra, Spain |
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PFC |
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ADAS @ adas @ VL2008a |
Serial |
1670 |
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| Author |
David Masip; Jordi Vitria |
| Title |
Shared Feature Extraction for Nearest Neighbor Face Recognition |
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Journal |
| Year |
2008 |
Publication |
IEEE Transactions on Neural Networks |
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| Volume |
19 |
Issue |
4 |
Pages |
586–595 |
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OR;MV |
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BCNPCL @ bcnpcl @ MaV2008 |
Serial |
944 |
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| Author |
David Masip; Agata Lapedriza; Jordi Vitria |
| Title |
Multitask Learning: An Application to Incremental Face Recognition |
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Conference Article |
| Year |
2008 |
Publication |
3rd International Conference on Computer Vision Theory and Applications |
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| Volume |
1 |
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585–590 |
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Madeira (Portugal) |
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VISAPP |
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OR; MV |
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no |
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BCNPCL @ bcnpcl @ MLV2008 |
Serial |
979 |
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| Author |
David Aldavert; Ricardo Toledo |
| Title |
Stereo Vision Local Map Alignment for Robot Environment Mapping |
Type |
Book Chapter |
| Year |
2008 |
Publication |
Robot Vision Second International Workshop, RobVis |
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4931 |
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Pages |
111–124 |
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Auckland (New Zealand) |
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Admin @ si @ AlT2008 |
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1100 |
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| Author |
Dani Rowe |
| Title |
Towards Robust Multiple-Target Tracking in Unconstrained Human-Populated Environments |
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Miscellaneous |
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2008 |
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CVC–UAB |
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978–84–935251–5–6 |
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no |
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Admin @ si @ Row2008 |
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1103 |
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| Author |
Carolina Malagelada; Fosca De Iorio; Fernando Azpiroz; Anna Accarino; Santiago Segui; Petia Radeva; Juan R. Malagelada |
| Title |
New Insight Into Intestinal Motor Function via Noninvasive Endoluminal Image Analysis |
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Journal |
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2008 |
Publication |
Gastroenterology |
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135 |
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4 |
Pages |
1155–1162 |
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MILAB |
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BCNPCL @ bcnpcl @ MDA2008 |
Serial |
1040 |
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| Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Joan Serrat; Antonio Lopez |
| Title |
Rank Estimation in 3D Multibody Motion Segmentation |
Type |
Journal Article |
| Year |
2008 |
Publication |
Electronic Letters |
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| Volume |
44 |
Issue |
4 |
Pages |
279-280 |
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A novel technique for rank estimation in 3D multibody motion segmentation is proposed. It is based on the study of the frequency spectra of moving rigid objects and does not use or assume a prior knowledge of the objects contained in the scene (i.e. number of objects and motion). The significance of rank estimation on multibody motion segmentation results is shown by using two motion segmentation algorithms over both synthetic and real data. |
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ADAS |
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ADAS @ adas @ JSL2008a |
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939 |
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| Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Joan Serrat; Antonio Lopez |
| Title |
An Adapted Alternation Approach for Recommender Systems |
Type |
Conference Article |
| Year |
2008 |
Publication |
IEEE International Conference on e–Business Engineering, |
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Pages |
128–135 |
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This paper presents an adaptation of the alternation technique to tackle the prediction task in recommender systems. These systems are widely considered in electronic commerce to help customers to find products they will probably like or dislike. As the SVD-based approaches, the proposed adapted alternation technique uses all the information stored in the system to find the predictions. The main advantage of this technique with respect to the SVD-based ones is that it can deal with missing data. Furthermore, it has a smaller computational cost. Experimental results with public data sets are provided in order to show the viability of the proposed adapted alternation approach. |
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Xi’an (Xina) |
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ADAS |
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ADAS @ adas @ JSL2008e |
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1044 |
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| Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Joan Serrat |
| Title |
Photometric Stereo through and Adapted Alternation Approach |
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Conference Article |
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2008 |
Publication |
IEEE International Conference on Image Processing, |
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1500–1503 |
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San Diego; CA; USA |
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ADAS |
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ADAS @ adas @ JSL2008d |
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1016 |
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| Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Antonio Lopez |
| Title |
Recovery of Surface Normals and Reflectance from Different Lighting Conditions |
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Conference Article |
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2008 |
Publication |
5th International Conference on Image Analysis and Recognition |
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5112 |
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315–325 |
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ADAS |
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ADAS @ adas @ JSL2008c |
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1014 |
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Carme Julia; Angel Sappa; Felipe Lumbreras |
| Title |
Aprendiendo a recrear la realidad en 3D |
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2008 |
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UAB Divulga, Revista de divulgacion cientifica |
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spreading;ADAS |
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ADAS @ adas @ JSL2008b |
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1472 |
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| Author |
Carme Julia |
| Title |
Missig Data Matrix Factorization Addressing the Structure from Motion Problem |
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Miscellaneous |
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2008 |
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CVC–UAB |
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Bellaterra |
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978–84–935251–6–3 |
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Admin @ si @ Jul2008 |
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1104 |
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| Author |
Carlo Gatta; Oriol Pujol; Oriol Rodriguez-Leor; J. Mauri; Petia Radeva |
| Title |
Robust Image-based IVUS Pullbacks Gating |
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Book Chapter |
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2008 |
Publication |
Proceedings 11th International ConferenceMedical Image Computing and Computer–Assisted Intervention |
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5242 |
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518–525 |
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NY (USA) |
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MICCAI |
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MILAB;HuPBA |
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BCNPCL @ bcnpcl @ GPR2008a |
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1037 |
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Carlo Gatta; Oriol Pujol; Oriol Rodriguez-Leor; J. Mauri; Petia Radeva |
| Title |
Improved Rigid Registration of Vessel Structures using the Fast Radial Symmetry Transform |
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Conference Article |
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2008 |
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Computer Vision for Intravascular Imaging CVII’08 Workshop Medical Image Computing and Computer–Assisted Intervention , 11th International Conference |
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128–136 |
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NY (USA) |
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MICCAI |
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MILAB;HUPBA |
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BCNPCL @ bcnpcl @ GPR2008b |
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1038 |
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