| Records |
| Author |
Jordi Gonzalez; Thomas B. Moeslund; Liang Wang |
| Title |
Semantic Understanding of Human Behaviors in Image Sequences: From video-surveillance to video-hermeneutics |
Type |
Journal Article |
| Year |
2012 |
Publication |
Computer Vision and Image Understanding |
Abbreviated Journal |
CVIU |
| Volume |
116 |
Issue |
3 |
Pages |
305–306 |
| Keywords |
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| Abstract |
Purpose: Atheromatic plaque progression is affected, among others phenomena, by biomechanical, biochemical, and physiological factors. In this paper, the authors introduce a novel framework able to provide both morphological (vessel radius, plaque thickness, and type) and biomechanical (wall shear stress and Von Mises stress) indices of coronary arteries.Methods: First, the approach reconstructs the three-dimensional morphology of the vessel from intravascular ultrasound (IVUS) and Angiographic sequences, requiring minimal user interaction. Then, a computational pipeline allows to automatically assess fluid-dynamic and mechanical indices. Ten coronary arteries are analyzed illustrating the capabilities of the tool and confirming previous technical and clinical observations.Results: The relations between the arterial indices obtained by IVUS measurement and simulations have been quantitatively analyzed along the whole surface of the artery, extending the analysis of the coronary arteries shown in previous state of the art studies. Additionally, for the first time in the literature, the framework allows the computation of the membrane stresses using a simplified mechanical model of the arterial wall.Conclusions: Circumferentially (within a given frame), statistical analysis shows an inverse relation between the wall shear stress and the plaque thickness. At the global level (comparing a frame within the entire vessel), it is observed that heavy plaque accumulations are in general calcified and are located in the areas of the vessel having high wall shear stress. Finally, in their experiments the inverse proportionality between fluid and structural stresses is observed. |
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| ISSN |
1077-3142 |
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ISE |
Approved |
no |
| Call Number |
Admin @ si @ GMW2012 |
Serial |
2005 |
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| Author |
Antonio Hernandez; Nadezhda Zlateva; Alexander Marinov; Miguel Reyes; Petia Radeva; Dimo Dimov; Sergio Escalera |
| Title |
Human Limb Segmentation in Depth Maps based on Spatio-Temporal Graph Cuts Optimization |
Type |
Journal Article |
| Year |
2012 |
Publication |
Journal of Ambient Intelligence and Smart Environments |
Abbreviated Journal |
JAISE |
| Volume |
4 |
Issue |
6 |
Pages |
535-546 |
| Keywords |
Multi-modal vision processing; Random Forest; Graph-cuts; multi-label segmentation; human body segmentation |
| Abstract |
We present a framework for object segmentation using depth maps based on Random Forest and Graph-cuts theory, and apply it to the segmentation of human limbs. First, from a set of random depth features, Random Forest is used to infer a set of label probabilities for each data sample. This vector of probabilities is used as unary term in α−β swap Graph-cuts algorithm. Moreover, depth values of spatio-temporal neighboring data points are used as boundary potentials. Results on a new multi-label human depth data set show high performance in terms of segmentation overlapping of the novel methodology compared to classical approaches. |
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Edition |
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| ISSN |
1876-1364 |
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| Notes |
MILAB;HuPBA |
Approved |
no |
| Call Number |
Admin @ si @ HZM2012a |
Serial |
2006 |
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| Author |
Sophie Wuerger; Kaida Xiao; Dimitris Mylonas; Q. Huang; Dimosthenis Karatzas; Galina Paramei |
| Title |
Blue green color categorization in mandarin english speakers |
Type |
Journal Article |
| Year |
2012 |
Publication |
Journal of the Optical Society of America A |
Abbreviated Journal |
JOSA A |
| Volume |
29 |
Issue |
2 |
Pages |
A102-A1207 |
| Keywords |
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| Abstract |
Observers are faster to detect a target among a set of distracters if the targets and distracters come from different color categories. This cross-boundary advantage seems to be limited to the right visual field, which is consistent with the dominance of the left hemisphere for language processing [Gilbert et al., Proc. Natl. Acad. Sci. USA 103, 489 (2006)]. Here we study whether a similar visual field advantage is found in the color identification task in speakers of Mandarin, a language that uses a logographic system. Forty late Mandarin-English bilinguals performed a blue-green color categorization task, in a blocked design, in their first language (L1: Mandarin) or second language (L2: English). Eleven color singletons ranging from blue to green were presented for 160 ms, randomly in the left visual field (LVF) or right visual field (RVF). Color boundary and reaction times (RTs) at the color boundary were estimated in L1 and L2, for both visual fields. We found that the color boundary did not differ between the languages; RTs at the color boundary, however, were on average more than 100 ms shorter in the English compared to the Mandarin sessions, but only when the stimuli were presented in the RVF. The finding may be explained by the script nature of the two languages: Mandarin logographic characters are analyzed visuospatially in the right hemisphere, which conceivably facilitates identification of color presented to the LVF. |
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DAG |
Approved |
no |
| Call Number |
Admin @ si @ WXM2012 |
Serial |
2007 |
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| Author |
Diego Cheda; Daniel Ponsa; Antonio Lopez |
| Title |
Monocular Egomotion Estimation based on Image Matching |
Type |
Conference Article |
| Year |
2012 |
Publication |
1st International Conference on Pattern Recognition Applications and Methods |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
425-430 |
| Keywords |
SLAM |
| Abstract |
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| Address |
Portugal |
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Expedition |
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Conference |
ICPRAM |
| Notes |
ADAS |
Approved |
no |
| Call Number |
Admin @ si @ CPL2012a;; ADAS @ adas @ |
Serial |
2011 |
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| Author |
Diego Cheda; Daniel Ponsa; Antonio Lopez |
| Title |
Monocular Depth-based Background Estimation |
Type |
Conference Article |
| Year |
2012 |
Publication |
7th International Conference on Computer Vision Theory and Applications |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
323-328 |
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| Abstract |
In this paper, we address the problem of reconstructing the background of a scene from a video sequence with occluding objects. The images are taken by hand-held cameras. Our method composes the background by selecting the appropriate pixels from previously aligned input images. To do that, we minimize a cost function that penalizes the deviations from the following assumptions: background represents objects whose distance to the camera is maximal, and background objects are stationary. Distance information is roughly obtained by a supervised learning approach that allows us to distinguish between close and distant image regions. Moving foreground objects are filtered out by using stationariness and motion boundary constancy measurements. The cost function is minimized by a graph cuts method. We demonstrate the applicability of our approach to recover an occlusion-free background in a set of sequences. |
| Address |
Roma |
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Conference |
VISAPP |
| Notes |
ADAS |
Approved |
no |
| Call Number |
Admin @ si @ CPL2012b; ADAS @ adas @ cpl2012e |
Serial |
2012 |
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| Author |
Fernando Barrera; Felipe Lumbreras; Cristhian Aguilera; Angel Sappa |
| Title |
Planar-Based Multispectral Stereo |
Type |
Conference Article |
| Year |
2012 |
Publication |
11th Quantitative InfraRed Thermography |
Abbreviated Journal |
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Issue |
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Pages |
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| Address |
Naples, Italy |
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Conference |
QIRT |
| Notes |
ADAS |
Approved |
no |
| Call Number |
Admin @ si @ BLA2012 |
Serial |
2016 |
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| Author |
Cristhian Aguilera; Fernando Barrera; Angel Sappa; Ricardo Toledo |
| Title |
A Novel SIFT-Like-Based Approach for FIR-VS Images Registration |
Type |
Conference Article |
| Year |
2012 |
Publication |
11th Quantitative InfraRed Thermography |
Abbreviated Journal |
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Issue |
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Pages |
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| Address |
Naples, Italy |
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QIRT |
| Notes |
ADAS; TV |
Approved |
no |
| Call Number |
Admin @ si @ ABS2012 |
Serial |
2017 |
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| Author |
Monica Piñol; Angel Sappa; Angeles Lopez; Ricardo Toledo |
| Title |
Feature Selection Based on Reinforcement Learning for Object Recognition |
Type |
Conference Article |
| Year |
2012 |
Publication |
Adaptive Learning Agents Workshop |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
33-39 |
| Keywords |
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| Address |
Valencia |
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Conference |
ALA |
| Notes |
ADAS; RV |
Approved |
no |
| Call Number |
Admin @ si @ PSL2012 |
Serial |
2018 |
| Permanent link to this record |
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| Author |
German Ros; Angel Sappa; Daniel Ponsa; Antonio Lopez |
| Title |
Visual SLAM for Driverless Cars: A Brief Survey |
Type |
Conference Article |
| Year |
2012 |
Publication |
IEEE Workshop on Navigation, Perception, Accurate Positioning and Mapping for Intelligent Vehicles |
Abbreviated Journal |
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Issue |
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Pages |
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SLAM |
| Abstract |
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| Address |
Alcalá de Henares |
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Conference |
IVW |
| Notes |
ADAS |
Approved |
no |
| Call Number |
Admin @ si @ RSP2012; ADAS @ adas |
Serial |
2019 |
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| Author |
Jose Carlos Rubio; Joan Serrat; Antonio Lopez |
| Title |
Multiple target tracking and identity linking under split, merge and occlusion of targets and observations |
Type |
Conference Article |
| Year |
2012 |
Publication |
1st International Conference on Pattern Recognition Applications and Methods |
Abbreviated Journal |
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Issue |
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Pages |
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Algarve, Portugal |
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ICPRAM |
| Notes |
ADAS |
Approved |
no |
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Admin @ si @ RSL2012c; ADAS @ adas |
Serial |
2034 |
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| Author |
Ferran Diego; G.D. Evangelidis; Joan Serrat |
| Title |
Night-time outdoor surveillance by mobile cameras |
Type |
Conference Article |
| Year |
2012 |
Publication |
1st International Conference on Pattern Recognition Applications and Methods |
Abbreviated Journal |
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| Volume |
2 |
Issue |
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Pages |
365-371 |
| Keywords |
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| Abstract |
This paper addresses the problem of video surveillance by mobile cameras. We present a method that allows online change detection in night-time outdoor surveillance. Because of the camera movement, background frames are not available and must be “localized” in former sequences and registered with the current frames. To this end, we propose a Frame Localization And Registration (FLAR) approach that solves the problem efficiently. Frames of former sequences define a database which is queried by current frames in turn. To quickly retrieve nearest neighbors, database is indexed through a visual dictionary method based on the SURF descriptor. Furthermore, the frame localization is benefited by a temporal filter that exploits the temporal coherence of videos. Next, the recently proposed ECC alignment scheme is used to spatially register the synchronized frames. Finally, change detection methods apply to aligned frames in order to mark suspicious areas. Experiments with real night sequences recorded by in-vehicle cameras demonstrate the performance of the proposed method and verify its efficiency and effectiveness against other methods. |
| Address |
Algarve, Portugal |
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ICPRAM |
| Notes |
ADAS |
Approved |
no |
| Call Number |
Admin @ si @ DES2012 |
Serial |
2035 |
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| Author |
Sergio Vera; Debora Gil; Agnes Borras; F. Javier Sanchez; Frederic Perez; Marius G. Linguraru |
| Title |
Computation and Evaluation of Medial Surfaces for Shape Representation of Abdominal Organs |
Type |
Conference Article |
| Year |
2011 |
Publication |
Workshop on Computational and Clinical Applications in Abdominal Imaging |
Abbreviated Journal |
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| Volume |
7029 |
Issue |
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Pages |
223-230 |
| Keywords |
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| Abstract |
Medial representations are powerful tools for describing and parameterizing the volumetric shape of anatomical structures. Existing methods show excellent results when applied to 2D objects, but their quality drops across dimensions. This paper contributes to the computation of medial manifolds in two aspects. First, we provide a standard scheme for the computation of medial manifolds that avoid degenerated medial axis segments; second, we introduce an energy based method which performs independently of the dimension. We evaluate quantitatively the performance of our method with respect to existing approaches, by applying them to synthetic shapes of known medial geometry. Finally, we show results on shape representation of multiple abdominal organs, exploring the use of medial manifolds for the representation of multi-organ relations. |
| Address |
Nice, France |
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Springer Berlin Heidelberg |
Place of Publication |
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In H. Yoshida et al |
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ABDI |
| Notes |
IAM; MV |
Approved |
no |
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VGB2011 |
Serial |
2036 |
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| Author |
Mohammad Ali Bagheri; Qigang Gao; Sergio Escalera |
| Title |
Three-Dimensional Design of Error Correcting Output Codes |
Type |
Conference Article |
| Year |
2012 |
Publication |
8th International Conference on Machine Learning and Data Mining |
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29- |
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Berlin, Germany |
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MLDM |
| Notes |
HuPBA;MILAB |
Approved |
no |
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Admin @ si @ BGE2012a |
Serial |
2041 |
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| Author |
Dimosthenis Karatzas;Ch. Lioutas |
| Title |
Software Package Development for Electron Diffraction Image Analysis |
Type |
Conference Article |
| Year |
1998 |
Publication |
Proceedings of the XIV Solid State Physics National Conference |
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Ioannina, Greece |
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DAG |
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no |
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IAM @ iam @ KaL1998 |
Serial |
2045 |
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| Author |
Francisco Cruz; Oriol Ramos Terrades |
| Title |
Document segmentation using relative location features |
Type |
Conference Article |
| Year |
2012 |
Publication |
21st International Conference on Pattern Recognition |
Abbreviated Journal |
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Issue |
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Pages |
1562-1565 |
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In this paper we evaluate the use of Relative Location Features (RLF) on a historical document segmentation task, and compare the quality of the results obtained on structured and unstructured documents using RLF and not using them. We prove that using these features improve the final segmentation on documents with a strong structure, while their application on unstructured documents does not show significant improvement. Although this paper is not focused on segmenting unstructured documents, results obtained on a benchmark dataset are equal or even overcome previous results of similar works. |
| Address |
Tsukuba Science City, Japan |
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ICPR |
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DAG |
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no |
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Admin @ si @ CrR2012 |
Serial |
2051 |
| Permanent link to this record |
