Records |
Author |
Fernando Vilariño; Panagiota Spyridonos; Jordi Vitria; Carolina Malagelada; Petia Radeva |
Title |
Linear Radial Patterns Characterization for Automatic Detection of Tonic Intestinal Contractions |
Type |
Book Chapter |
Year |
2006 |
Publication |
11th Iberoamerican Congress on Pattern Recognition |
Abbreviated Journal |
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Volume |
4225 |
Issue |
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Pages |
178–187 |
Keywords |
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Abstract |
This work tackles the categorization of general linear radial patterns by means of the valleys and ridges detection and the use of descriptors of directional information, which are provided by steerable filters in different regions of the image. We successfully apply our proposal in the specific case of automatic detection of tonic contractions in video capsule endoscopy, which represent a paradigmatic example of linear radial patterns. |
Address |
Cancun (Mexico) |
Corporate Author |
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Thesis |
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Publisher |
Springer Verlag |
Place of Publication |
Berlin Heidelberg |
Editor |
.F. Mart ́ınez-Trinidad et al |
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 |
LNCS |
Series Volume |
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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 |
800 |
Expedition |
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Conference |
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Notes |
MV;OR;MILAB;SIAI |
Approved |
no |
Call Number |
BCNPCL @ bcnpcl @ VSV2006c; IAM @ iam @ VSB2006f |
Serial |
728 |
Permanent link to this record |
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Author |
Fernando Vilariño; Panagiota Spyridonos; Jordi Vitria; Carolina Malagelada; Petia Radeva |
Title |
A Machine Learning framework using SOMs: Applications in the Intestinal Motility Assessment |
Type |
Book Chapter |
Year |
2006 |
Publication |
11th Iberoamerican Congress on Pattern Recognition |
Abbreviated Journal |
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Volume |
4225 |
Issue |
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Pages |
188–197 |
Keywords |
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Abstract |
Small Bowel Motility Assessment by means of Wireless Capsule Video Endoscopy constitutes a novel clinical methodology in which a capsule with a micro-camera attached to it is swallowed by the patient, emitting a RF signal which is recorded as a video of its trip throughout the gut. In order to overcome the main drawbacks associated with this technique -mainly related to the large amount of visualization time required-, our efforts have been focused on the development of a machine learning system, built up in sequential stages, which provides the specialists with the useful part of the video, rejecting those parts not valid for analysis. We successfully used Self Organized Maps in a general semi-supervised framework with the aim of tackling the different learning stages of our system. The analysis of the diverse types of images and the automatic detection of intestinal contractions is performed under the perspective of intestinal motility assessment in a clinical environment. |
Address |
Cancun (Mexico) |
Corporate Author |
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Thesis |
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Publisher |
Springer Verlag |
Place of Publication |
Berlin-Heidelberg |
Editor |
J.P. Martinez–Trinidad et al |
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 |
LNCS |
Series Volume |
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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 |
800 |
Expedition |
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Conference |
CIARP06 |
Notes |
MV;OR;MILAB;SIAI |
Approved |
no |
Call Number |
BCNPCL @ bcnpcl @ VSV2006d; IAM @ iam @ VSV2006e |
Serial |
729 |
Permanent link to this record |
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Author |
Panagiota Spyridonos; Fernando Vilariño; Jordi Vitria; Fernando Azpiroz; Petia Radeva |
Title |
Anisotropic Feature Extraction from Endoluminal Images for Detection of Intestinal Contractions |
Type |
Book Chapter |
Year |
2006 |
Publication |
9th International Conference on Medical Image Computing and Computer–Assisted Intervention |
Abbreviated Journal |
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Volume |
4191 |
Issue |
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Pages |
161–168 |
Keywords |
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Abstract |
Wireless endoscopy is a very recent and at the same time unique technique allowing to visualize and study the occurrence of con- tractions and to analyze the intestine motility. Feature extraction is es- sential for getting efficient patterns to detect contractions in wireless video endoscopy of small intestine. We propose a novel method based on anisotropic image filtering and efficient statistical classification of con- traction features. In particular, we apply the image gradient tensor for mining informative skeletons from the original image and a sequence of descriptors for capturing the characteristic pattern of contractions. Fea- tures extracted from the endoluminal images were evaluated in terms of their discriminatory ability in correct classifying images as either belong- ing to contractions or not. Classification was performed by means of a support vector machine classifier with a radial basis function kernel. Our classification rates gave sensitivity of the order of 90.84% and specificity of the order of 94.43% respectively. These preliminary results highlight the high efficiency of the selected descriptors and support the feasibility of the proposed method in assisting the automatic detection and analysis of contractions. |
Address |
Copenhagen (Denmark) |
Corporate Author |
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Thesis |
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Publisher |
Springer Verlag |
Place of Publication |
Berlin Heidelberg |
Editor |
R. Larsen, M. Nielsen, and J. Sporring |
Language |
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Summary Language |
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Original Title |
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LNCS |
Series Volume |
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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 |
800 |
Expedition |
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Conference |
MICCAI06 |
Notes |
MV;OR;MILAB;SIAI |
Approved |
no |
Call Number |
BCNPCL @ bcnpcl @ SVV2006; IAM @ iam @ SVV2006 |
Serial |
725 |
Permanent link to this record |
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Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Joan Serrat; Antonio Lopez |
Title |
An Iterative Multiresolution Scheme for SFM |
Type |
Conference Article |
Year |
2006 |
Publication |
International Conference on Image Analysis and Recognition |
Abbreviated Journal |
ICIAR 2006 |
Volume |
LNCS 4141 |
Issue |
1 |
Pages |
804–815 |
Keywords |
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Abstract |
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Notes |
ADAS |
Approved |
no |
Call Number |
ADAS @ adas @ JSL2006c |
Serial |
704 |
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Author |
F.Guirado; Ana Ripoll; C.Roig; Aura Hernandez-Sabate; Emilio Luque |
Title |
Exploiting Throughput for Pipeline Execution in Streaming Image Processing Applications |
Type |
Book Chapter |
Year |
2006 |
Publication |
Euro-Par 2006 Parallel Processing |
Abbreviated Journal |
LNCS |
Volume |
4128 |
Issue |
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Pages |
1095-1105 |
Keywords |
12th International Euro–Par Conference |
Abstract |
There is a large range of image processing applications that act on an input sequence of image frames that are continuously received. Throughput is a key performance measure to be optimized when execu- ting them. In this paper we propose a new task replication methodology for optimizing throughput for an image processing application in the field of medicine. The results show that by applying the proposed methodo- logy we are able to achieve the desired throughput in all cases, in such a way that the input frames can be processed at any given rate. |
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Thesis |
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Publisher |
Springer-Verlag Berlin Heidelberg |
Place of Publication |
Dresden, Germany (European Union) |
Editor |
UAB; W, E.N.; et al. |
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 |
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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 |
Euro–Par |
Notes |
IAM |
Approved |
no |
Call Number |
IAM @ iam @ GRR2006a |
Serial |
1542 |
Permanent link to this record |
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Author |
Carme Julia; Angel Sappa; Felipe Lumbreras; Joan Serrat; Antonio Lopez |
Title |
Factorization with Missing and Noisy Data |
Type |
Conference Article |
Year |
2006 |
Publication |
6th International Conference on Computational Science |
Abbreviated Journal |
ICCS´06 |
Volume |
LNCS 3991 |
Issue |
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Pages |
555–562 |
Keywords |
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Abstract |
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Address |
Reading (United Kingdom) |
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Conference |
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Notes |
ADAS |
Approved |
no |
Call Number |
ADAS @ adas @ JSL2006b |
Serial |
653 |
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Author |
Anton Cervantes; Gemma Sanchez; Josep Llados; Agnes Borras; Ana Rodriguez |
Title |
Biometric Recognition Based on Line Shape Descriptors |
Type |
Book Chapter |
Year |
2006 |
Publication |
Lecture Notes in Computer Science |
Abbreviated Journal |
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Volume |
3926 |
Issue |
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Pages |
346–357, |
Keywords |
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Abstract |
Abstract. In this paper we propose biometric descriptors inspired by shape signatures traditionally used in graphics recognition approaches. In particular several methods based on line shape descriptors used to iden- tify newborns from the biometric information of the ears are developed. The process steps are the following: image acquisition, ear segmentation, ear normalization, feature extraction and identification. Several shape signatures are defined from contour images. These are formulated in terms of zoning and contour crossings descriptors. Experimental results are presented to demonstrate the effectiveness of the used techniques. |
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Publisher |
Springer Link |
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Notes |
DAG |
Approved |
no |
Call Number |
DAG @ dag @ CSL2006 |
Serial |
685 |
Permanent link to this record |
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Author |
W. Liu; Josep Llados |
Title |
Graphics Recognition. Ten Years Review and Future Perspectives |
Type |
Book Whole |
Year |
2006 |
Publication |
6th International Workshop |
Abbreviated Journal |
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Volume |
3926 |
Issue |
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Pages |
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Keywords |
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Abstract |
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Address |
Hong Kong (China) |
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Publisher |
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Editor |
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Original Title |
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Series Editor |
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Series Title |
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LNCS |
Series Volume |
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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 |
GREC |
Notes |
DAG |
Approved |
no |
Call Number |
DAG @ dag @ LiL2006 |
Serial |
800 |
Permanent link to this record |
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Author |
Joel Barajas; Jaume Garcia; Karla Lizbeth Caballero; Francesc Carreras; Sandra Pujades; Petia Radeva |
Title |
Correction of Misalignment Artifacts Among 2-D Cardiac MR Images in 3-D Space |
Type |
Conference Article |
Year |
2006 |
Publication |
1st International Wokshop on Computer Vision for Intravascular and Intracardiac Imaging (CVII’06) |
Abbreviated Journal |
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Volume |
3217 |
Issue |
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Pages |
114-121 |
Keywords |
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Abstract |
Cardiac Magnetic Resonance images offer the opportunity to study the heart in detail. One of the main issues in its modelling is to create an accurate 3-D reconstruction of the left ventricle from 2-D views. A first step to achieve this goal is the correct registration among the different image planes due to patient movements. In this article, we present an accurate method to correct displacement artifacts using the Normalized Mutual Information. Here, the image views are treated as planes in order to diminish the approximation error caused by the association of a certain thickness, and moved simultaneously to avoid any kind of bias in the alignment process. This method has been validated using real and syntectic plane displacements, yielding promising results. |
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Thesis |
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Publisher |
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Place of Publication |
Copenhagen (Denmark) |
Editor |
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ISBN |
978-3-540-22977-3 |
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Conference |
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Notes |
IAM;MILAB |
Approved |
no |
Call Number |
IAM @ iam @ BGC2006 |
Serial |
1485 |
Permanent link to this record |
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Author |
Debora Gil; Jose Maria-Carazo; Roberto Marabini |
Title |
On the nature of 2D crystal unbending |
Type |
Journal Article |
Year |
2006 |
Publication |
Journal of Structural Biology |
Abbreviated Journal |
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Volume |
156 |
Issue |
3 |
Pages |
546-555 |
Keywords |
Electron microscopy |
Abstract |
Crystal unbending, the process that aims to recover a perfect crystal from experimental data, is one of the more important steps in electron crystallography image processing. The unbending process involves three steps: estimation of the unit cell displacements from their ideal positions, extension of the deformation field to the whole image and transformation of the image in order to recover an ideal crystal. In this work, we present a systematic analysis of the second step oriented to address two issues. First, whether the unit cells remain undistorted and only the distance between them should be changed (rigid case) or should be modified with the same deformation suffered by the whole crystal (elastic case). Second, the performance of different extension algorithms (interpolation versus approximation) is explored. Our experiments show that there is no difference between elastic and rigid cases or among the extension algorithms. This implies that the deformation fields are constant over large areas. Furthermore, our results indicate that the main source of error is the transformation of the crystal image. |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
1047-8477 |
ISBN |
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Medium |
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Area |
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Conference |
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Notes |
IAM; |
Approved |
no |
Call Number |
IAM @ iam @ GCM2006 |
Serial |
1519 |
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Author |
Oriol Rodriguez-Leor; 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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Edition |
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Notes |
IAM; |
Approved |
no |
Call Number |
IAM @ iam @ RGF2006 |
Serial |
1640 |
Permanent link to this record |
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Author |
Angel Sappa; David Geronimo; Fadi Dornaika; Antonio Lopez |
Title |
On-board camera extrinsic parameter estimation |
Type |
Journal Article |
Year |
2006 |
Publication |
Electronics Letters |
Abbreviated Journal |
EL |
Volume |
42 |
Issue |
13 |
Pages |
745–746 |
Keywords |
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Abstract |
An efficient technique for real-time estimation of camera extrinsic parameters is presented. It is intended to be used on on-board vision systems for driving assistance applications. The proposed technique is based on the use of a commercial stereo vision system that does not need any visual feature extraction. |
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Publisher |
IEE |
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Notes |
ADAS |
Approved |
no |
Call Number |
ADAS @ adas @ SGD2006a |
Serial |
655 |
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Author |
Aura Hernandez-Sabate; Debora Gil; J. Mauri; Petia Radeva |
Title |
Reducing cardiac motion in IVUS sequences |
Type |
Conference Article |
Year |
2006 |
Publication |
Proceeding of Computers in Cardiology |
Abbreviated Journal |
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Volume |
33 |
Issue |
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Pages |
685-688 |
Keywords |
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Abstract |
Cardiac vessel displacement is a main artifact in IVUS sequences. It hinders visualization of the main structures in an appropriate orientation and alignment and affects extracting vessel measurements. In this paper, we present a novel approach for image sequence alignment based on spectral analysis, which removes rigid dynamics, preserving at the same time the vessel geometry. First, we suppress the translation by taking, for each frame, the center of mass of the image as origin of coordinates. In polar coordinates with such point as origin, the rotation appears as a horizontal displacement. The translation induces a phase shift in the Fourier coefficients of two consecutive polar images. We estimate the phase by adjusting a regression plane to the phases of the principal frequencies. Experiments show that the presented strategy suppress cardiac motion regardless of the acquisition device. 1. |
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IAM; MILAB |
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no |
Call Number |
IAM @ iam @ HGM2006a |
Serial |
1554 |
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Author |
Oriol Ramos Terrades; Ernest Valveny |
Title |
A new use of the ridgelets transform for describing linear singularities in images |
Type |
Journal Article |
Year |
2006 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
Volume |
27 |
Issue |
6 |
Pages |
587–596 |
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DAG |
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no |
Call Number |
DAG @ dag @ RaV2006a |
Serial |
635 |
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Author |
Jaume Amores; N. Sebe; Petia Radeva |
Title |
Boosting the distance estimation: Application to the K-Nearest Neighbor Classifier |
Type |
Journal Article |
Year |
2006 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
Volume |
27 |
Issue |
3 |
Pages |
201–209 |
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ADAS;MILAB |
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no |
Call Number |
ADAS @ adas @ ASR2006 |
Serial |
643 |
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