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Author Jean-Pascal Jacob; Mariella Dimiccoli; L. Moisan edit   pdf
url  openurl
  Title Active skeleton for bacteria modelling Type Journal Article
  Year 2017 Publication Computer Methods in Biomechanics and Biomedical Engineering: Imaging and Visualization Abbreviated Journal CMBBE  
  Volume 5 Issue 4 Pages 274-286  
  Keywords  
  Abstract The investigation of spatio-temporal dynamics of bacterial cells and their molecular components requires automated image analysis tools to track cell shape properties and molecular component locations inside the cells. In the study of bacteria aging, the molecular components of interest are protein aggregates accumulated near bacteria boundaries. This particular location makes very ambiguous the correspondence between aggregates and cells, since computing accurately bacteria boundaries in phase-contrast time-lapse imaging is a challenging task. This paper proposes an active skeleton formulation for bacteria modelling which provides several advantages: an easy computation of shape properties (perimeter, length, thickness and orientation), an improved boundary accuracy in noisy images and a natural bacteria-centred coordinate system that permits the intrinsic location of molecular components inside the cell. Starting from an initial skeleton estimate, the medial axis of the bacterium is obtained by minimising an energy function which incorporates bacteria shape constraints. Experimental results on biological images and comparative evaluation of the performances validate the proposed approach for modelling cigar-shaped bacteria like Escherichia coli. The Image-J plugin of the proposed method can be found online at http://fluobactracker.inrialpes.fr.  
  Address  
  Corporate Author Thesis  
  Publisher Taylor & Francis Group Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @JDM2017 Serial 2784  
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Author G. de Oliveira; A. Cartas; Marc Bolaños; Mariella Dimiccoli; Xavier Giro; Petia Radeva edit   pdf
openurl 
  Title LEMoRe: A Lifelog Engine for Moments Retrieval at the NTCIR-Lifelog LSAT Task Type Conference Article
  Year 2016 Publication 12th NTCIR Conference on Evaluation of Information Access Technologies Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract Semantic image retrieval from large amounts of egocentric visual data requires to leverage powerful techniques for filling in the semantic gap. This paper introduces LEMoRe, a Lifelog Engine for Moments Retrieval, developed in the context of the Lifelog Semantic Access Task (LSAT) of the the NTCIR-12 challenge and discusses its performance variation on different trials. LEMoRe integrates classical image descriptors with high-level semantic concepts extracted by Convolutional Neural Networks (CNN), powered by a graphic user interface that uses natural language processing. Although this is just a first attempt towards interactive image retrieval from large egocentric datasets and there is a large room for improvement of the system components and the user interface, the structure of the system itself and the way the single components cooperate are very promising.  
  Address Tokyo; Japan; June 2016  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference NTCIR  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @OCB2016 Serial 2789  
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Author Maria Salamo; Inmaculada Rodriguez; Maite Lopez; Anna Puig; Simone Balocco; Mariona Taule edit  openurl
  Title Recurso docente para la atención de la diversidad en el aula mediante la predicción de notas Type Journal
  Year 2016 Publication ReVision Abbreviated Journal  
  Volume 9 Issue 1 Pages  
  Keywords Aprendizaje automatico; Sistema de prediccion de notas; Herramienta docente  
  Abstract Desde la implantación del Espacio Europeo de Educación Superior (EEES) en los diferentes grados, se ha puesto de manifiesto la necesidad de utilizar diversos mecanismos que permitan tratar la diversidad en el aula, evaluando automáticamente y proporcionando una retroalimentación rápida tanto al alumnado como al profesorado sobre la evolución de los alumnos en una asignatura. En este artículo se presenta la evaluación de la exactitud en las predicciones de GRADEFORESEER, un recurso docente para la predicción de notas basado en técnicas de aprendizaje automático que permite evaluar la evolución del alumnado y estimar su nota final al terminar el curso. Este recurso se ha complementado con una interfaz de usuario para el profesorado que puede ser usada en diferentes plataformas software (sistemas operativos) y en cualquier asignatura de un grado en la que se utilice evaluación continuada. Además de la descripción del recurso, este artículo presenta los resultados obtenidos al aplicar el sistema de predicción en cuatro asignaturas de disciplinas distintas: Programación I (PI), Diseño de Software (DSW) del grado de Ingeniería Informática, Tecnologías de la Información y la Comunicación (TIC) del grado de Lingüística y la asignatura Fundamentos de Tecnología (FDT) del grado de Información y Documentación, todas ellas impartidas en la Universidad de Barcelona.

La capacidad predictiva se ha evaluado de forma binaria (aprueba o no) y según un criterio de rango (suspenso, aprobado, notable o sobresaliente), obteniendo mejores predicciones en los resultados evaluados de forma binaria.
 
  Address  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @ SRL2016 Serial 2820  
Permanent link to this record
 

 
Author Jose Marone; Simone Balocco; Marc Bolaños; Jose Massa; Petia Radeva edit   pdf
openurl 
  Title Learning the Lumen Border using a Convolutional Neural Networks classifier Type Conference Article
  Year 2016 Publication 19th International Conference on Medical Image Computing and Computer Assisted Intervention Workshop Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract IntraVascular UltraSound (IVUS) is a technique allowing the diagnosis of coronary plaque. An accurate (semi-)automatic assessment of the luminal contours could speed up the diagnosis. In most of the approaches, the information on the vessel shape is obtained combining a supervised learning step with a local refinement algorithm. In this paper, we explore for the first time, the use of a Convolutional Neural Networks (CNN) architecture that on one hand is able to extract the optimal image features and at the same time can serve as a supervised classifier to detect the lumen border in IVUS images. The main limitation of CNN, relies on the fact that this technique requires a large amount of training data due to the huge amount of parameters that it has. To
solve this issue, we introduce a patch classification approach to generate an extended training-set from a few annotated images. An accuracy of 93% and F-score of 71% was obtained with this technique, even when it was applied to challenging frames containig calcified plaques, stents and catheter shadows.
 
  Address Athens; Greece; October 2016  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference MICCAIW  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @ MBB2016 Serial 2822  
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Author Sumit K. Banchhor; Tadashi Araki; Narendra D. Londhe; Nobutaka Ikeda; Petia Radeva; Ayman El-Baz; Luca Saba; Andrew Nicolaides; Shoaib Shafique; John R. Laird; Jasjit S. Suri edit  doi
openurl 
  Title Five multiresolution-based calcium volume measurement techniques from coronary IVUS videos: A comparative approach Type Journal Article
  Year 2016 Publication Computer Methods and Programs in Biomedicine Abbreviated Journal CMPB  
  Volume 134 Issue Pages 237-258  
  Keywords  
  Abstract BACKGROUND AND OBJECTIVE:
Fast intravascular ultrasound (IVUS) video processing is required for calcium volume computation during the planning phase of percutaneous coronary interventional (PCI) procedures. Nonlinear multiresolution techniques are generally applied to improve the processing time by down-sampling the video frames.
METHODS:
This paper presents four different segmentation methods for calcium volume measurement, namely Threshold-based, Fuzzy c-Means (FCM), K-means, and Hidden Markov Random Field (HMRF) embedded with five different kinds of multiresolution techniques (bilinear, bicubic, wavelet, Lanczos, and Gaussian pyramid). This leads to 20 different kinds of combinations. IVUS image data sets consisting of 38,760 IVUS frames taken from 19 patients were collected using 40 MHz IVUS catheter (Atlantis® SR Pro, Boston Scientific®, pullback speed of 0.5 mm/sec.). The performance of these 20 systems is compared with and without multiresolution using the following metrics: (a) computational time; (b) calcium volume; (c) image quality degradation ratio; and (d) quality assessment ratio.
RESULTS:
Among the four segmentation methods embedded with five kinds of multiresolution techniques, FCM segmentation combined with wavelet-based multiresolution gave the best performance. FCM and wavelet experienced the highest percentage mean improvement in computational time of 77.15% and 74.07%, respectively. Wavelet interpolation experiences the highest mean precision-of-merit (PoM) of 94.06 ± 3.64% and 81.34 ± 16.29% as compared to other multiresolution techniques for volume level and frame level respectively. Wavelet multiresolution technique also experiences the highest Jaccard Index and Dice Similarity of 0.7 and 0.8, respectively. Multiresolution is a nonlinear operation which introduces bias and thus degrades the image. The proposed system also provides a bias correction approach to enrich the system, giving a better mean calcium volume similarity for all the multiresolution-based segmentation methods. After including the bias correction, bicubic interpolation gives the largest increase in mean calcium volume similarity of 4.13% compared to the rest of the multiresolution techniques. The system is automated and can be adapted in clinical settings.
CONCLUSIONS:
We demonstrated the time improvement in calcium volume computation without compromising the quality of IVUS image. Among the 20 different combinations of multiresolution with calcium volume segmentation methods, the FCM embedded with wavelet-based multiresolution gave the best performance.
 
  Address  
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  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @ BAL2016 Serial 2830  
Permanent link to this record
 

 
Author Alvaro Peris; Marc Bolaños; Petia Radeva; Francisco Casacuberta edit   pdf
openurl 
  Title Video Description Using Bidirectional Recurrent Neural Networks Type Conference Article
  Year 2016 Publication 25th International Conference on Artificial Neural Networks Abbreviated Journal  
  Volume 2 Issue Pages 3-11  
  Keywords Video description; Neural Machine Translation; Birectional Recurrent Neural Networks; LSTM; Convolutional Neural Networks  
  Abstract Although traditionally used in the machine translation field, the encoder-decoder framework has been recently applied for the generation of video and image descriptions. The combination of Convolutional and Recurrent Neural Networks in these models has proven to outperform the previous state of the art, obtaining more accurate video descriptions. In this work we propose pushing further this model by introducing two contributions into the encoding stage. First, producing richer image representations by combining object and location information from Convolutional Neural Networks and second, introducing Bidirectional Recurrent Neural Networks for capturing both forward and backward temporal relationships in the input frames.  
  Address Barcelona; September 2016  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference ICANN  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @ PBR2016 Serial 2833  
Permanent link to this record
 

 
Author Alejandro Cartas; Petia Radeva; Mariella Dimiccoli edit  url
openurl 
  Title Modeling long-term interactions to enhance action recognition Type Conference Article
  Year 2021 Publication 25th International Conference on Pattern Recognition Abbreviated Journal  
  Volume Issue Pages 10351-10358  
  Keywords  
  Abstract In this paper, we propose a new approach to under-stand actions in egocentric videos that exploits the semantics of object interactions at both frame and temporal levels. At the frame level, we use a region-based approach that takes as input a primary region roughly corresponding to the user hands and a set of secondary regions potentially corresponding to the interacting objects and calculates the action score through a CNN formulation. This information is then fed to a Hierarchical LongShort-Term Memory Network (HLSTM) that captures temporal dependencies between actions within and across shots. Ablation studies thoroughly validate the proposed approach, showing in particular that both levels of the HLSTM architecture contribute to performance improvement. Furthermore, quantitative comparisons show that the proposed approach outperforms the state-of-the-art in terms of action recognition on standard benchmarks,without relying on motion information  
  Address January 2021  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference ICPR  
  Notes (down) MILAB; Approved no  
  Call Number Admin @ si @ CRD2021 Serial 3626  
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Author Petia Radeva; J. Guerrero; C. Molina edit  openurl
  Title A Physics-Based Kohonen Ring. Type Miscellaneous
  Year 1998 Publication SPIE – Medical Imaging. Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address San Diego; CA; USA  
  Corporate Author Thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ RGM1998 Serial 19  
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Author C. Molina; G.P. Prause; Petia Radeva; M. Sonka edit  openurl
  Title Catheter Path Reconstruction from Biplane Angiography using 3D Snakes. Type Miscellaneous
  Year 1998 Publication SPIE – Medical imaging. Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address San Diego; CA; USA  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ MPR1998 Serial 22  
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Author Xose M. Pardo; Petia Radeva; Juan J. Villanueva edit  openurl
  Title Self-Training Statistic Snake for Image Segmentation and Tracking. Type Miscellaneous
  Year 1999 Publication Abbreviated Journal  
  Volume Issue Pages  
  Keywords  
  Abstract  
  Address Venice  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ PRV1999 Serial 26  
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Author X. Binefa; Petia Radeva; J.A. Cortijo; J. Garcia edit  openurl
  Title Contour detection and color influence in defocused environtments. Type Miscellaneous
  Year 1998 Publication Abbreviated Journal  
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  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ BRC1998 Serial 28  
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Author V. Valev; B. Sankur; Petia Radeva edit  openurl
  Title Generalized Non-Reducible Descriptors. Type Miscellaneous
  Year 1997 Publication Technical Report. Abbreviated Journal  
  Volume Issue Pages  
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  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ VSR1997 Serial 65  
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Author E Fernandez-Nofrerias; J. Mauri; A. Tovar; L. Cano; E. Martinez; C. Julia; V. Valle; David Rotger; Petia Radeva edit  openurl
  Title Correspondencia de las imagenes de angiografia y ecografia intracoronaria: La fusion. Type Miscellaneous
  Year 2001 Publication XXXVII Congreso Nacional de la Sociedad Española de Cardiologia Abbreviated Journal  
  Volume Issue Pages  
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  Abstract  
  Address Barcelona (Spain)  
  Corporate Author Thesis  
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  Series Editor Series Title Abbreviated Series Title  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ FMT2001 Serial 91  
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Author V. Valev; Petia Radeva edit  openurl
  Title Structural Pattern Recognition by Non-Reducible Descriptors Type Conference Article
  Year 1994 Publication Proc. International Workshop on Syntactic and Structural Pattern Recognition. Abbreviated Journal  
  Volume Issue Pages  
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  Abstract  
  Address Nahariya, Israel  
  Corporate Author Thesis  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ VaR1994 Serial 107  
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Author J. Mauri; E Fernandez-Nofrerias; A. Tovar; E. Martinez; L. Cano; V. Valle; David Rotger; Cristina Cañero; Petia Radeva edit  openurl
  Title Ecografia Intracoronaria: Un Nou Pas, la Fusio de Imatges amb la Angiografia, el Software. Type Journal Article
  Year 2001 Publication Revista de la Societat Catalana de Cardiologia, XIIIe Congres de la Societat Catalana de Cardiologia, 4(1):48. Abbreviated Journal  
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  Area Expedition Conference  
  Notes (down) MILAB Approved no  
  Call Number BCNPCL @ bcnpcl @ MFT2001 Serial 136  
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