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Author | Jaume Amores; David Geronimo; Antonio Lopez | ||||
Title | Multiple instance and active learning for weakly-supervised object-class segmentation | Type | Conference Article | ||
Year | 2010 | Publication | 3rd IEEE International Conference on Machine Vision | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Keywords | Multiple Instance Learning; Active Learning; Object-class segmentation. | ||||
Abstract | In object-class segmentation, one of the most tedious tasks is to manually segment many object examples in order to learn a model of the object category. Yet, there has been little research on reducing the degree of manual annotation for
object-class segmentation. In this work we explore alternative strategies which do not require full manual segmentation of the object in the training set. In particular, we study the use of bounding boxes as a coarser and much cheaper form of segmentation and we perform a comparative study of several Multiple-Instance Learning techniques that allow to obtain a model with this type of weak annotation. We show that some of these methods can be competitive, when used with coarse segmentations, with methods that require full manual segmentation of the objects. Furthermore, we show how to use active learning combined with this weakly supervised strategy. As we see, this strategy permits to reduce the amount of annotation and optimize the number of examples that require full manual segmentation in the training set. |
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Address | Hong-Kong | ||||
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Area | Expedition | Conference | ICMV | ||
Notes | ADAS | Approved | no | ||
Call Number | ADAS @ adas @ AGL2010b | Serial | 1429 | ||
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Author | Joan Mas; Gemma Sanchez; Josep Llados | ||||
Title | SSP: Sketching slide Presentations, a Syntactic Approach | Type | Conference Article | ||
Year | 2009 | Publication | 8th IAPR International Workshop on Graphics Recognition | Abbreviated Journal | |
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Abstract | The design of a slide presentation is a creative process. In this process first, humans visualize in their minds what they want to explain. Then, they have to be able to represent this knowledge in an understandable way. There exists a lot of commercial software that allows to create our own slide presentations but the creativity of the user is rather limited. In this article we present an application that allows the user to create and visualize a slide presentation from a sketch. A slide may be seen as a graphical document or a diagram where its elements are placed in a particular spatial arrangement. To describe and recognize slides a syntactic approach is proposed. This approach is based on an Adjacency Grammar and a parsing methodology to cope with this kind of grammars. The experimental evaluation shows the performance of our methodology from a qualitative and a quantitative point of view. Six different slides containing different number of symbols, from 4 to 7, have been given to the users and they have drawn them without restrictions in the order of the elements. The quantitative results give an idea on how suitable is our methodology to describe and recognize the different elements in a slide. | ||||
Address | La Rochelle; France; July 2009 | ||||
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Area | Expedition | Conference | GREC | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ MSL2009a | Serial | 1441 | ||
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Author | Salim Jouili; Salvatore Tabbone; Ernest Valveny | ||||
Title | Comparing Graph Similarity Measures for Graphical Recognition. | Type | Conference Article | ||
Year | 2009 | Publication | 8th IAPR International Workshop on Graphics Recognition | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | In this paper we evaluate four graph distance measures. The analysis is performed for document retrieval tasks. For this aim, different kind of documents are used including line drawings (symbols), ancient documents (ornamental letters), shapes and trademark-logos. The experimental results show that the performance of each graph distance measure depends on the kind of data and the graph representation technique. | ||||
Address | La Rochelle; France; July 2009 | ||||
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Publisher | Springer | Place of Publication | Editor | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | LNCS | ||
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ISSN | ISBN | Medium | |||
Area | Expedition | Conference | GREC | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ JTV2009 | Serial | 1442 | ||
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Author | Marçal Rusiñol; K. Bertet; Jean-Marc Ogier; Josep Llados | ||||
Title | Symbol Recognition Using a Concept Lattice of Graphical Patterns | Type | Conference Article | ||
Year | 2009 | Publication | 8th IAPR International Workshop on Graphics Recognition | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | In this paper we propose a new approach to recognize symbols by the use of a concept lattice. We propose to build a concept lattice in terms of graphical patterns. Each model symbol is decomposed in a set of composing graphical patterns taken as primitives. Each one of these primitives is described by boundary moment invariants. The obtained concept lattice relates which symbolic patterns compose a given graphical symbol. A Hasse diagram is derived from the context and is used to recognize symbols affected by noise. We present some preliminary results over a variation of the dataset of symbols from the GREC 2005 symbol recognition contest. | ||||
Address | La Rochelle; July 2009 | ||||
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ISSN | ISBN | Medium | |||
Area | Expedition | Conference | GREC | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ RBO2009 | Serial | 1444 | ||
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Author | Partha Pratim Roy; Umapada Pal; Josep Llados | ||||
Title | Touching Text Character Localization in Graphical Documents using SIFT | Type | Conference Article | ||
Year | 2009 | Publication | In proceedings 8th IAPR International Workshop on Graphics Recognition | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | Interpretation of graphical document images is a challenging task as it requires proper understanding of text/graphics symbols present in such documents. Difficulties arise in graphical document recognition when text and symbol overlapped/touched. Intersection of text and symbols with graphical lines and curves occur frequently in graphical documents and hence separation of such symbols is very difficult.
Several pattern recognition and classification techniques exist to recognize isolated text/symbol. But, the touching/overlapping text and symbol recognition has not yet been dealt successfully. An interesting technique, Scale Invariant Feature Transform (SIFT), originally devised for object recognition can take care of overlapping problems. Even if SIFT features have emerged as a very powerful object descriptors, their employment in graphical documents context has not been investigated much. In this paper we present the adaptation of the SIFT approach in the context of text character localization (spotting) in graphical documents. We evaluate the applicability of this technique in such documents and discuss the scope of improvement by combining some state-of-the-art approaches. |
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Address | La rochelle; July 2009 | ||||
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Language | Summary Language | Original Title | |||
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ISSN | ISBN | Medium | |||
Area | Expedition | Conference | GREC | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ RPL2009c | Serial | 1445 | ||
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Author | Jorge Bernal; F. Javier Sanchez; Fernando Vilariño | ||||
Title | Reduction of Pattern Search Area in Colonoscopy Images by Merging Non-Informative Regions | Type | Conference Article | ||
Year | 2010 | Publication | 28th Congreso Anual de la Sociedad Española de Ingeniería Biomédica | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | One of the first usual steps in pattern recognition schemas is image segmentation, in order to reduce the dimensionality of the problem and manage smaller quantity of data. In our case as we are pursuing real-time colon cancer polyp detection, this step is crucial. In this paper we present a non-informative region estimation algorithm that will let us discard some parts of the image where we will not expect to find colon cancer polyps. The performance of our approach will be measured in terms of both non-informative areas elimination and polyps’ areas preserving. The results obtained show the importance of having correct non- informative region estimation in order to fasten the whole recognition process. | ||||
Address | Madrid (Spain) | ||||
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Area | 800 | Expedition | Conference | CASEIB | |
Notes | MV;SIAI | Approved | no | ||
Call Number | Admin @ si @ BSV2010 | Serial | 1469 | ||
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Author | Cristina Cañero; Petia Radeva; Oriol Pujol; Ricardo Toledo; Debora Gil; J. Saludes; Juan J. Villanueva; B. Garcia del Blanco; J. Mauri; E. Fernandez-Nofrerias; J.A. Gomez-Hospital; E. Iraculis; J. Comin; C. Quiles; F. Jara; A. Cequier; E. Esplugas | ||||
Title | Optimal Stent Implantation: Three-dimensional Evaluation of the Mutual Position of Stent and Vessel via Intracoronary Ecography | Type | Conference Article | ||
Year | 1999 | Publication | Proceedings of International Conference on Computer in Cardiology (CIC´99) | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | We present a new automatic technique to visualize and quantify the mutual position between the stent and the vessel wall by considering their three-dimensional reconstruction. Two deformable generalized cylinders adapt to the image features in all IVUS planes corresponding to the vessel wall and the stent in order to reconstruct the boundaries of the stent and the vessel in space. The image features that characterize the stent and the vessel wall are determined in terms of edge and ridge image detectors taking into account the gray level of the image pixels. We show that the 30 reconstruction by deformable cylinders is accurate and robust due to the spatial data coherence in the considered volumetric IVUS image. The main clinic utility of the stent and vessel reconstruction by deformable’ cylinders consists of its possibility to visualize and to assess the optimal stent introduction. | ||||
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Notes | MILAB; RV; IAM; ADAS; HuPBA | Approved | no | ||
Call Number | IAM @ iam @ CRP1999a | Serial | 1491 | ||
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Author | Cristina Cañero; Petia Radeva; Oriol Pujol; Ricardo Toledo; Debora Gil; J. Saludes; Juan J. Villanueva; B. Garcia del Blanco; J. Mauri; Eduard Fernandez-Nofrerias; J.A. Gomez-Hospital; E. Iraculis; J. Comin; C. Quiles; F. Jara; A. Cequier; E.Esplugas | ||||
Title | Three-dimensional reconstruction and quantification of the coronary tree using intravascular ultrasound images | Type | Conference Article | ||
Year | 1999 | Publication | Proceedings of International Conference on Computer in Cardiology (CIC´99) | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | In this paper we propose a new Computer Vision technique to reconstruct the vascular wall in space using a deformable model-based technique and compounding methods, based in biplane angiography and intravascular ultrasound data jicsion. It is also proposed a generalpurpose three-dimensional guided interpolation method. The three dimensional centerline of the vessel is reconstructed from geometrically corrected biplane angiographies using automatic segmentation methods and snakes. The IVUS image planes are located in the threedimensional space and correctly oriented. A led interpolation method based in B-SurJaces and snakes isused to fill the gaps among image planes | ||||
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Area | Expedition | Conference | CINC99 | ||
Notes | MILAB;RV;IAM;ADAS;HuPBA | Approved | no | ||
Call Number | IAM @ iam @ CRP1999b | Serial | 1492 | ||
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Author | Gemma Sanchez; Josep Llados; Enric Marti | ||||
Title | A string-based method to recognize symbols and structural textures in architectural plans | Type | Conference Article | ||
Year | 1997 | Publication | 2nd IAPR Workshop on Graphics Recognition | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | This paper deals with the recognition of symbols and struc- tural textures in architectural plans using string matching techniques. A plan is represented by an attributed graph whose nodes represent characteristic points and whose edges represent segments. Symbols and textures can be seen as a set of regions, i.e. closed loops in the graph, with a particular arrangement. The search for a symbol involves a graph matching between the regions of a model graph and the regions of the graph representing the document. Discriminating a texture means a clus- tering of neighbouring regions of this graph. Both procedures involve a similarity measure between graph regions. A string codification is used to represent the sequence of outlining edges of a region. Thus, the simila- rity between two regions is defined in terms of the string edit distance between their boundary strings. The use of string matching allows the recognition method to work also under presence of distortion. | ||||
Address | Nancy, France | ||||
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Notes | DAG; IAM | Approved | no | ||
Call Number | IAM @ iam @ SLE1997 | Serial | 1498 | ||
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Author | M. Gomez; J. Mauri; Eduard Fernandez-Nofrerias; Oriol Rodriguez-Leor; Carme Julia; Debora Gil; Petia Radeva | ||||
Title | Reconstrucción de un modelo espacio-temporal de la luz del vaso a partir de secuencias de ecografía intracoronaria | Type | Conference Article | ||
Year | 2002 | Publication | XXXVIII Congreso Nacional de la Sociedad Española de Cardiología. | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
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ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | IAM;ADAS;MILAB | Approved | no | ||
Call Number | IAM @ iam @ GMF2002d | Serial | 1516 | ||
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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) | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Keywords | 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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Publisher | Place of Publication | Venezia (Italia) | Editor | ||
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Series Volume | Series Issue | Edition | |||
ISSN | B-31470-08 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | IAM | Approved | no | ||
Call Number | IAM @ iam @ GGV2008c | Serial | 1521 | ||
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Author | Debora Gil; Aura Hernandez-Sabate; Antoni Carol; Oriol Rodriguez; Petia Radeva | ||||
Title | A Deterministic-Statistic Adventitia Detection in IVUS Images | Type | Conference Article | ||
Year | 2005 | Publication | ESC Congress | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Keywords | Electron microscopy; Unbending; 2D crystal; Interpolation; Approximation | ||||
Abstract | Plaque analysis in IVUS planes needs accurate intima and adventitia models. Large variety in adventitia descriptors difficulties its detection and motivates using a classification strategy for selecting points on the structure. Whatever the set of descriptors used, the selection stage suffers from fake responses due to noise and uncompleted true curves. In order to smooth background noise while strengthening responses, we apply a restricted anisotropic filter that homogenizes grey levels along the image significant structures. Candidate points are extracted by means of a simple semi supervised adaptive classification of the filtered image response to edge and calcium detectors. The final model is obtained by interpolating the former line segments with an anisotropic contour closing technique based on functional extension principles. | ||||
Address | Stockholm; Sweden; September 2005 | ||||
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Publisher | Place of Publication | ,Sweden (EU) | Editor | ||
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Area | Expedition | Conference | ESC | ||
Notes | IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ RMF2005a | Serial | 1523 | ||
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Author | Debora Gil; Petia Radeva; Jordi Saludes; J. Mauri | ||||
Title | Automatic Segmentation of Artery Wall in Coronary IVUS Images: a Probabilistic Approach | Type | Conference Article | ||
Year | 2000 | Publication | Proceedings of CIC’2000 | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | Intravascular ultrasound images represent a unique tool to analyze the morphology of arteries and vessels (plaques, restenosis, etc). The poor quality of these images makes unsupervised segmentation based on traditional segmentation algorithms (such as edge or ridge/valley detection) fail to achieve the expected results. In this paper we present a probabilistic flexible template to separate different regions in the image. In particular, we use elliptic templates to model and detect the shape of the vessel inner wall in IVUS images. We present the results of successful segmentation obtained from patients undergoing stent treatment. A physician team has validated these results. | ||||
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Publisher | Place of Publication | Cambridge, Massachussets | Editor | ||
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Area | Expedition | Conference | CIC | ||
Notes | IAM;MILAB | Approved | no | ||
Call Number | IAM @ iam @ GRS2000 | Serial | 1538 | ||
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Author | Debora Gil; Petia Radeva; Fernando Vilariño | ||||
Title | Anisotropic Contour Completion | Type | Conference Article | ||
Year | 2003 | Publication | Proceedings of the IEEE International Conference on Image Processing | Abbreviated Journal | |
Volume | Issue | Pages ![]() |
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Abstract | In this paper we introduce a novel application of the diffusion tensor for anisotropic image processing. The Anisotropic Contour Completion (ACC) we suggest consists in extending the characteristic function of the open curve by means of a degenerated diffusion tensor that prevents any diffusion in the normal direction. We show that ACC is equivalent to a dilation with a continuous elliptic structural element that takes into account the local orientation of the contours to be closed. Experiments on contours extracted from real images show that ACC produces shapes able to adapt to any curve in an active contour framework. 1. | ||||
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Publisher | Place of Publication | Barcelona, Spain | Editor | ||
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ISSN | ISBN | 0-7803-7751-6 | Medium | ||
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Notes | IAM;MV;MILAB;SIAI | Approved | no | ||
Call Number | IAM @ iam @ GRV2003 | Serial | 1539 | ||
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Author | Josep Llados; Horst Bunke; Enric Marti | ||||
Title | Using cyclic string matching to find rotational and reflectional symmetric shapes | Type | Conference Article | ||
Year | 1996 | Publication | Dagstuhl Seminar on Modelling and Planning for Sensor–based Intelligent Robot Systems | Abbreviated Journal | |
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Publisher | World Scientific | Place of Publication | Saarbrucken (Germany). | Editor | R.C. Bolles, H.B.H.N. |
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Notes | DAG;IAM | Approved | no | ||
Call Number | IAM @ iam @ LBM1996 | Serial | 1564 | ||
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