| Records |
| Author |
Sergio Escalera; David Masip; Eloi Puertas; Petia Radeva; Oriol Pujol |
| Title |
Online Error-Correcting Output Codes |
Type |
Journal Article |
| Year |
2011 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
32 |
Issue |
3 |
Pages |
458-467 |
| Keywords |
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| Abstract |
IF JCR CCIA 1.303 2009 54/103
This article proposes a general extension of the error correcting output codes framework to the online learning scenario. As a result, the final classifier handles the addition of new classes independently of the base classifier used. In particular, this extension supports the use of both online example incremental and batch classifiers as base learners. The extension of the traditional problem independent codings one-versus-all and one-versus-one is introduced. Furthermore, two new codings are proposed, unbalanced online ECOC and a problem dependent online ECOC. This last online coding technique takes advantage of the problem data for minimizing the number of dichotomizers used in the ECOC framework while preserving a high accuracy. These techniques are validated on an online setting of 11 data sets from UCI database and applied to two real machine vision applications: traffic sign recognition and face recognition. As a result, the online ECOC techniques proposed provide a feasible and robust way for handling new classes using any base classifier. |
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| Publisher |
Elsevier |
Place of Publication  |
North Holland |
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Edition |
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| ISSN |
0167-8655 |
ISBN |
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Conference |
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| Notes |
MILAB;OR;HuPBA;MV |
Approved |
no |
| Call Number |
Admin @ si @ EMP2011 |
Serial |
1714 |
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| Author |
Oriol Pujol; Debora Gil; Petia Radeva |
| Title |
Fundamentals of Stop and Go active models |
Type |
Journal Article |
| Year |
2005 |
Publication |
Image and Vision Computing |
Abbreviated Journal |
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| Volume |
23 |
Issue |
8 |
Pages |
681-691 |
| Keywords |
Deformable models; Geodesic snakes; Region-based segmentation |
| Abstract |
An efficient snake formulation should conform to the idea of picking the smoothest curve among all the shapes approximating an object of interest. In current geodesic snakes, the regularizing curvature also affects the convergence stage, hindering the latter at concave regions. In the present work, we make use of characteristic functions to define a novel geodesic formulation that decouples regularity and convergence. This term decoupling endows the snake with higher adaptability to non-convex shapes. Convergence is ensured by splitting the definition of the external force into an attractive vector field and a repulsive one. In our paper, we propose to use likelihood maps as approximation of characteristic functions of object appearance. The better efficiency and accuracy of our decoupled scheme are illustrated in the particular case of feature space-based segmentation. |
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| Publisher |
Butterworth-Heinemann |
Place of Publication |
Newton, MA, USA |
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Edition |
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| ISSN |
0262-8856 |
ISBN |
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| Notes |
IAM;MILAB;HuPBA |
Approved |
no |
| Call Number |
IAM @ iam @ PGR2005 |
Serial |
1629 |
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| Author |
Debora Gil; Petia Radeva |
| Title |
Inhibition of false landmarks |
Type |
Journal Article |
| Year |
2006 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
27 |
Issue |
9 |
Pages |
1022-1030 |
| Keywords |
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| Abstract |
Corners and junctions are landmarks characterized by the lack of differentiability in the unit tangent to the image level curve. Detectors based on differential operators are not, by their own definition, the best posed as they require a higher degree of differentiability to yield a reliable response. We argue that a corner detector should be based on the degree of continuity of the tangent vector to the image level sets, work on the image domain and need no assumptions on neither the image local structure nor the particular geometry of the corner/junction. An operator measuring the degree of differentiability of the projection matrix on the image gradient fulfills the above requirements. Because using smoothing kernels leads to corner misplacement, we suggest an alternative fake response remover based on the receptive field inhibition of spurious details. The combination of both orientation discontinuity detection and noise inhibition produce our inhibition orientation energy (IOE) landmark locator. |
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Elsevier Science Inc. |
Place of Publication |
New York, NY, USA |
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0167-8655 |
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| Notes |
IAM;MILAB |
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no |
| Call Number |
IAM @ iam @ GiR2006 |
Serial |
1529 |
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| Author |
Ernest Valveny; Enric Marti |
| Title |
A model for image generation and symbol recognition through the deformation of lineal shapes |
Type |
Journal Article |
| Year |
2003 |
Publication |
Pattern Recognition Letters |
Abbreviated Journal |
PRL |
| Volume |
24 |
Issue |
15 |
Pages |
2857-2867 |
| Keywords |
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| Abstract |
We describe a general framework for the recognition of distorted images of lineal shapes, which relies on three items: a model to represent lineal shapes and their deformations, a model for the generation of distorted binary images and the combination of both models in a common probabilistic framework, where the generation of deformations is related to an internal energy, and the generation of binary images to an external energy. Then, recognition consists in the minimization of a global energy function, performed by using the EM algorithm. This general framework has been applied to the recognition of hand-drawn lineal symbols in graphic documents. |
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| Publisher |
Elsevier Science Inc. |
Place of Publication |
New York, NY, USA |
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Edition |
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| ISSN |
0167-8655 |
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| Notes |
DAG; IAM |
Approved |
no |
| Call Number |
IAM @ iam @ VAM2003 |
Serial |
1653 |
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| Author |
Enric Marti; Carme Julia; Debora Gil |
| Title |
A PBL Experience in the Teaching of Computer Graphics |
Type |
Journal Article |
| Year |
2006 |
Publication |
Computer Graphics Forum |
Abbreviated Journal |
CGF |
| Volume |
25 |
Issue |
1 |
Pages |
95-103 |
| Keywords |
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| Abstract |
Project-Based Learning (PBL) is an educational strategy to improve student’s learning capability that, in recent years, has had a progressive acceptance in undergraduate studies. This methodology is based on solving a problem or project in a student working group. In this way, PBL focuses on learning the necessary tools to correctly find a solution to given problems. Since the learning initiative is transferred to the student, the PBL method promotes students own abilities. This allows a better assessment of the true workload that carries out the student in the subject. It follows that the methodology conforms to the guidelines of the Bologna document, which quantifies the student workload in a subject by means of the European credit transfer system (ECTS). PBL is currently applied in undergraduate studies needing strong practical training such as medicine, nursing or law sciences. Although this is also the case in engineering studies, amazingly, few experiences have been reported. In this paper we propose to use PBL in the educational organization of the Computer Graphics subjects in the Computer Science degree. Our PBL project focuses in the development of a C++ graphical environment based on the OpenGL libraries for visualization and handling of different graphical objects. The starting point is a basic skeleton that already includes lighting functions, perspective projection with mouse interaction to change the point of view and three predefined objects. Students have to complete this skeleton by adding their own functions to solve the project. A total number of 10 projects have been proposed and successfully solved. The exercises range from human face rendering to articulated objects, such as robot arms or puppets. In the present paper we extensively report the statement and educational objectives for two of the projects: solar system visualization and a chess game. We report our earlier educational experience based on the standard classroom theoretical, problem and practice sessions and the reasons that motivated searching for other learning methods. We have mainly chosen PBL because it improves the student learning initiative. We have applied the PBL educational model since the beginning of the second semester. The student’s feedback increases in his interest for the subject. We present a comparative study of the teachers’ and students’ workload between PBL and the classic teaching approach, which suggests that the workload increase in PBL is not as high as it seems. |
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Computer Graphics Forum |
Place of Publication |
Computer Vision CenterComputer Science Department Escola Tcnica Superior d’Enginyeria (UAB), Edifi |
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| Notes |
IAM;ADAS; |
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no |
| Call Number |
IAM @ iam @ MJG2006a |
Serial |
1607 |
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| Author |
Enric Marti; Jordi Regincos;Jaime Lopez-Krahe; Juan J.Villanueva |
| Title |
Hand line drawing interpretation as three-dimensional objects |
Type |
Journal Article |
| Year |
1993 |
Publication |
Signal Processing – Intelligent systems for signal and image understanding |
Abbreviated Journal |
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| Volume |
32 |
Issue |
1-2 |
Pages |
91-110 |
| Keywords |
Line drawing interpretation; line labelling; scene analysis; man-machine interaction; CAD input; line extraction |
| Abstract |
In this paper we present a technique to interpret hand line drawings as objects in a three-dimensional space. The object domain considered is based on planar surfaces with straight edges, concretely, on ansextension of Origami world to hidden lines. The line drawing represents the object under orthographic projection and it is sensed using a scanner. Our method is structured in two modules: feature extraction and feature interpretation. In the first one, image processing techniques are applied under certain tolerance margins to detect lines and junctions on the hand line drawing. Feature interpretation module is founded on line labelling techniques using a labelled junction dictionary. A labelling algorithm is here proposed. It uses relaxation techniques to reduce the number of incompatible labels with the junction dictionary so that the convergence of solutions can be accelerated. We formulate some labelling hypotheses tending to eliminate elements in two sets of labelled interpretations. That is, those which are compatible with the dictionary but do not correspond to three-dimensional objects and those which represent objects not very probable to be specified by means of a line drawing. New entities arise on the line drawing as a result of the extension of Origami world. These are defined to enunciate the assumptions of our method as well as to clarify the algorithms proposed. This technique is framed in a project aimed to implement a system to create 3D objects to improve man-machine interaction in CAD systems. |
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Elsevier North-Holland, Inc. |
Place of Publication |
Amsterdam, The Netherlands, The Netherlands |
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Edition |
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| ISSN |
0165-1684 |
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| Notes |
IAM;ISE; |
Approved |
no |
| Call Number |
IAM @ iam @ MRL1993 |
Serial |
1611 |
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| Author |
Petia Radeva; Judit Martinez; A. Tovar; X. Binefa; Jordi Vitria; Juan J. Villanueva |
| Title |
CORKIDENT: an automatic vision system for real-time inspection of natural products. |
Type |
Journal Article |
| Year |
1999 |
Publication |
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OR;MILAB;MV |
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no |
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BCNPCL @ bcnpcl @ RMT1999 |
Serial |
23 |
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| Author |
Maria Vanrell; Jordi Vitria; Xavier Roca |
| Title |
A multidimensional scaling approach to explore the behavior of a texture perception algorithm. |
Type |
Journal Article |
| Year |
1997 |
Publication |
Machine Vision and Applications |
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9 |
Issue |
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Pages |
262–271 |
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OR;ISE;CIC;MV |
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no |
| Call Number |
BCNPCL @ bcnpcl @ VVR1997 |
Serial |
35 |
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| Author |
Jordi Vitria; J. Llacer |
| Title |
Reconstructing 3D light microscopic images using the EM algorithm |
Type |
Journal Article |
| Year |
1996 |
Publication |
Pattern Recognition Letters |
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| Volume |
17 |
Issue |
14 |
Pages |
1491–1498 |
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OR;MV |
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BCNPCL @ bcnpcl @ ViL1996 |
Serial |
74 |
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| Author |
D. Seron; F. Moreso; C. Gratin; Jordi Vitria; E. Condom |
| Title |
Automated classification of renal interstitium and tubules by local texture analysis and a neural network |
Type |
Journal Article |
| Year |
1996 |
Publication |
Analytical and Quantitative Cytology and Histology |
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18 |
Issue |
5 |
Pages |
410-9, PMID: 8908314 |
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OR;MV |
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BCNPCL @ bcnpcl @ SMG1996 |
Serial |
76 |
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| Author |
Felipe Lumbreras; Joan Serrat |
| Title |
Wavelet filtering for the segmentation of marble images. |
Type |
Journal Article |
| Year |
1996 |
Publication |
Optical Engineering |
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35 |
Issue |
10 |
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ADAS |
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no |
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ADAS @ adas @ LuS1996a |
Serial |
77 |
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| Author |
Felipe Lumbreras; Joan Serrat |
| Title |
Segmentation of petrographical images of marbles |
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Journal Article |
| Year |
1996 |
Publication |
Computers and Geosciences |
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22 |
Issue |
5 |
Pages |
547–558 |
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ADAS |
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no |
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ADAS @ adas @ LuS1996b |
Serial |
82 |
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| Author |
F. Moreso; D. Seron; Jordi Vitria; J.M. Grinyo; F.M. Colome-Serra; N. Pares; J.R. Serra |
| Title |
Quantification of Interstitial Chronic Renal Damage by means of Texture Analysis. |
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Journal Article |
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1994 |
Publication |
Kidney International |
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46 |
Issue |
6 |
Pages |
1721-1727 |
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OR;MV |
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BCNPCL @ bcnpcl @ MSV1994 |
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113 |
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| Author |
A. Martinez; Jordi Vitria |
| Title |
A Development Plataform for Autonomous Agents. |
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Journal Article |
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1995 |
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ASI–AA–95 – Practice and Future of Autonomous Agents. |
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Monte Verita, Switzerland. |
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BCNPCL @ bcnpcl @ MaV1995b |
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123 |
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J. Mauri; E Fernandez-Nofrerias; A. Tovar; E. Martinez; L. Cano; V. Valle; David Rotger; Cristina Cañero; Petia Radeva |
| Title |
Ecografia Intracoronaria: Un Nou Pas, la Fusio de Imatges amb la Angiografia, el Software. |
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Journal Article |
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2001 |
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Revista de la Societat Catalana de Cardiologia, XIIIe Congres de la Societat Catalana de Cardiologia, 4(1):48. |
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MILAB |
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BCNPCL @ bcnpcl @ MFT2001 |
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136 |
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