| Records |
| Author |
Carles Sanchez; Debora Gil; Antoni Rosell; Albert Andaluz; F. Javier Sanchez |
| Title |
Segmentation of Tracheal Rings in Videobronchoscopy combining Geometry and Appearance |
Type |
Conference Article |
| Year |
2013 |
Publication |
Proceedings of the International Conference on Computer Vision Theory and Applications |
Abbreviated Journal |
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| Volume |
1 |
Issue |
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Pages |
153--161 |
| Keywords |
Video-bronchoscopy, tracheal ring segmentation, trachea geometric and appearance model |
| Abstract |
Videobronchoscopy is a medical imaging technique that allows interactive navigation inside the respiratory pathways and minimal invasive interventions. Tracheal procedures are ordinary interventions that require measurement of the percentage of obstructed pathway for injury (stenosis) assessment. Visual assessment of stenosis in videobronchoscopic sequences requires high expertise of trachea anatomy and is prone to human error. Accurate detection of tracheal rings is the basis for automated estimation of the size of stenosed trachea. Processing of videobronchoscopic images acquired at the operating room is a challenging task due to the wide range of artifacts and acquisition conditions. We present a model of the geometric-appearance of tracheal rings for its detection in videobronchoscopic videos. Experiments on sequences acquired at the operating room, show a performance close to inter-observer variability |
| Address |
Barcelona; February 2013 |
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Thesis |
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| Publisher |
SciTePress |
Place of Publication |
Portugal |
Editor |
Sebastiano Battiato and José Braz |
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Series Title |
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Abbreviated Series Title |
LNCS |
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Series Issue |
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Edition |
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| ISSN |
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ISBN |
978-989-8565-47-1 |
Medium |
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| Area |
800 |
Expedition |
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Conference |
VISAPP |
| Notes |
IAM;MV; 600.044; 600.047; 600.060; 605.203 |
Approved |
no |
Call Number  |
IAM @ iam @ SGR2013 |
Serial |
2123 |
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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 |
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| Volume |
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Issue |
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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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Conference |
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| Notes |
DAG; IAM |
Approved |
no |
| Call Number |
IAM @ iam @ SLE1997 |
Serial |
1498 |
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| Author |
Josep Llados; Gemma Sanchez; Enric Marti |
| Title |
A string based method to recognize symbols and structural textures in architectural plans |
Type |
Book Chapter |
| Year |
1998 |
Publication |
Graphics Recognition Algorithms and Systems Second International Workshop, GREC' 97 Nancy, France, August 22–23, 1997 Selected Papers |
Abbreviated Journal |
LNCS |
| Volume |
1389 |
Issue |
1998 |
Pages |
91-103 |
| Keywords |
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| Abstract |
This paper deals with the recognition of symbols and structural 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 clustering 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 similarity 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 |
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Thesis |
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| Publisher |
Springer Link |
Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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Series Title |
LNCS |
Abbreviated Series Title |
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Series Issue |
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Edition |
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ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
DAG; IAM |
Approved |
no |
| Call Number |
IAM @ iam @ SLE1998 |
Serial |
1573 |
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| Author |
Gemma Sanchez; Josep Llados; Enric Marti |
| Title |
Segmentation and analysis of linial texture in plans |
Type |
Conference Article |
| Year |
1997 |
Publication |
Intelligence Artificielle et Complexité. |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
Structural Texture, Voronoi, Hierarchical Clustering, String Matching. |
| Abstract |
The problem of texture segmentation and interpretation is one of the main concerns in the field of document analysis. Graphical documents often contain areas characterized by a structural texture whose recognition allows both the document understanding, and its storage in a more compact way. In this work, we focus on structural linial textures of regular repetition contained in plan documents. Starting from an atributed graph which represents the vectorized input image, we develop a method to segment textured areas and recognize their placement rules. We wish to emphasize that the searched textures do not follow a predefined pattern. Minimal closed loops of the input graph are computed, and then hierarchically clustered. In this hierarchical clustering, a distance function between two closed loops is defined in terms of their areas difference and boundary resemblance computed by a string matching procedure. Finally it is noted that, when the texture consists of isolated primitive elements, the same method can be used after computing a Voronoi Tesselation of the input graph. |
| Address |
Paris, France |
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Thesis |
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Place of Publication |
Paris |
Editor |
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Expedition |
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Conference |
AERFAI |
| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ SLM1997 |
Serial |
1649 |
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| Author |
Joan Serrat; Enric Marti |
| Title |
Elastic matching using interpolation splines |
Type |
Conference Article |
| Year |
1991 |
Publication |
IV Spanish Symposium of Pattern Recognition and image Analysis |
Abbreviated Journal |
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Issue |
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Pages |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
ADAS;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ SMV1991 |
Serial |
1651 |
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| Author |
Carles Sanchez;F. Javier Sanchez; Antoni Rosell; Debora Gil |
| Title |
An illumination model of the trachea appearance in videobronchoscopy images |
Type |
Book Chapter |
| Year |
2012 |
Publication |
Image Analysis and Recognition |
Abbreviated Journal |
LNCS |
| Volume |
7325 |
Issue |
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Pages |
313-320 |
| Keywords |
Bronchoscopy, tracheal ring, stenosis assesment, trachea appearance model, segmentation |
| Abstract |
Videobronchoscopy is a medical imaging technique that allows interactive navigation inside the respiratory pathways. This imaging modality provides realistic images and allows non-invasive minimal intervention procedures. Tracheal procedures are routinary interventions that require assessment of the percentage of obstructed pathway for injury (stenosis) detection. Visual assessment in videobronchoscopic sequences requires high expertise of trachea anatomy and is prone to human error.
This paper introduces an automatic method for the estimation of steneosed trachea percentage reduction in videobronchoscopic images. We look for tracheal rings , whose deformation determines the degree of obstruction. For ring extraction , we present a ring detector based on an illumination and appearance model. This model allows us to parametrise the ring detection. Finally, we can infer optimal estimation parameters for any video resolution. |
| Address |
Aveiro, Portugal |
| Corporate Author |
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Thesis |
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| Publisher |
Springer Berlin Heidelberg |
Place of Publication |
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Editor |
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| Language |
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Original Title |
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Series Title |
Lecture Notes in Computer Science |
Abbreviated Series Title |
LNCS |
| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0302-9743 |
ISBN |
978-3-642-31297-7 |
Medium |
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| Area |
800 |
Expedition |
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Conference |
ICIAR |
| Notes |
MV;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ SSR2012 |
Serial |
1898 |
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| Author |
Gemma Sanchez; Ernest Valveny; Josep Llados; Enric Marti; Oriol Ramos Terrades; N.Lozano; Joan Mas |
| Title |
A system for virtual prototyping of architectural projects |
Type |
Conference Article |
| Year |
2003 |
Publication |
Proceedings of Fifth IAPR International Workshop on Pattern Recognition |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
65-74 |
| Keywords |
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| Abstract |
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Expedition |
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Conference |
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| Notes |
DAG;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ SVL2003 |
Serial |
1650 |
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| Author |
F. Javier Sanchez; Jordi Vitria; Enric Marti |
| Title |
Transformaciones Morfológicas de Polígonos Isotéticos |
Type |
Conference Article |
| Year |
1991 |
Publication |
Primer Congreso Español de Informática Gráfica. |
Abbreviated Journal |
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Pages |
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Series Issue |
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Edition |
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Medium |
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Conference |
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| Notes |
OR;IAM;MV |
Approved |
no |
| Call Number |
IAM @ iam @ SVM1991 |
Serial |
1648 |
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| Author |
Panagiota Spyridonos; Fernando Vilariño; Jordi Vitria; Petia Radeva; Fernando Azpiroz; Juan Malagelada |
| Title |
Device, system and method for automatic detection of contractile activity in an image frame |
Type |
Patent |
| Year |
2011 |
Publication |
US 2011/0044515 A1 |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
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| Abstract |
A device, system and method for automatic detection of contractile activity of a body lumen in an image frame is provided, wherein image frames during contractile activity are captured and/or image frames including contractile activity are automatically detected, such as through pattern recognition and/or feature extraction to trace image frames including contractions, e.g., with wrinkle patterns. A manual procedure of annotation of contractions, e.g. tonic contractions in capsule endoscopy, may consist of the visualization of the whole video by a specialist, and the labeling of the contraction frames. Embodiments of the present invention may be suitable for implementation in an in vivo imaging system. |
| Address |
Pearl Cohen Zedek Latzer, LLP, 1500 Broadway 12th Floor, New York (NY) 10036 (US) |
| Corporate Author |
US Patent Office |
Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Issue |
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Edition |
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Medium |
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Expedition |
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Conference |
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| Notes |
MV;OR;MILAB;SIAI |
Approved |
no |
| Call Number |
IAM @ iam @ SVV2011 |
Serial |
1701 |
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| Author |
Mariano Vazquez; Ruth Aris; Guillaume Hozeaux; R.Aubry; P.Villar;Jaume Garcia ; Debora Gil; Francesc Carreras |
| Title |
A massively parallel computational electrophysiology model of the heart |
Type |
Journal Article |
| Year |
2011 |
Publication |
International Journal for Numerical Methods in Biomedical Engineering |
Abbreviated Journal |
IJNMBE |
| Volume |
27 |
Issue |
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Pages |
1911-1929 |
| Keywords |
computational electrophysiology; parallelization; finite element methods |
| Abstract |
This paper presents a patient-sensitive simulation strategy capable of using the most efficient way the high-performance computational resources. The proposed strategy directly involves three different players: Computational Mechanics Scientists (CMS), Image Processing Scientists and Cardiologists, each one mastering its own expertise area within the project. This paper describes the general integrative scheme but focusing on the CMS side presents a massively parallel implementation of computational electrophysiology applied to cardiac tissue simulation. The paper covers different angles of the computational problem: equations, numerical issues, the algorithm and parallel implementation. The proposed methodology is illustrated with numerical simulations testing all the different possibilities, ranging from small domains up to very large ones. A key issue is the almost ideal scalability not only for large and complex problems but also for medium-size meshes. The explicit formulation is particularly well suited for solving this highly transient problems, with very short time-scale. |
| Address |
Swansea (UK) |
| Corporate Author |
John Wiley & Sons, Ltd. |
Thesis |
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| Publisher |
John Wiley & Sons, Ltd. |
Place of Publication |
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IAM |
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no |
| Call Number |
IAM @ iam @ VAH2011 |
Serial |
1198 |
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| Author |
Ernest Valveny; Enric Marti |
| Title |
Dimensions analysis in hand-drawn architectural drawings |
Type |
Conference Article |
| Year |
1997 |
Publication |
VII National Simposium of Pattern Recognition and image Analysis, SNRFAI´97 |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
90-91 |
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Place of Publication |
CVC-UAB |
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Conference |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ VAM1997 |
Serial |
1659 |
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| Author |
Ernest Valveny; Enric Marti |
| Title |
Recognition of lineal symbols in hand-written drawings using deformable template matching |
Type |
Conference Article |
| Year |
1999 |
Publication |
Proceedings of the VIII Symposium Nacional de Reconocimiento de Formas y Análisis de Imágenes |
Abbreviated Journal |
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Conference |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ VAM1999 |
Serial |
1658 |
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| Author |
Ernest Valveny; Enric Marti |
| Title |
Application of deformable template matching to symbol recognition in hand-written architectural draw |
Type |
Conference Article |
| Year |
1999 |
Publication |
Proceedings of the Fifth International Conference on |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Abstract |
We propose to use deformable template matching as a new approach to recognize characters and lineal symbols in hand-written line drawings, instead of traditional methods based on vectorization and feature extraction. Bayesian formulation of the deformable template matching allows combining fidelity to the ideal shape of the symbol with maximum flexibility to get the best fit to the input image. Lineal nature of symbols can be exploited to define a suitable representation of models and the set of deformations to be applied to them. Matching, however, is done over the original binary image to avoid losing relevant features during vectorization. We have applied this method to hand-written architectural drawings and experimental results demonstrate that symbols with high distortions from ideal shape can be accurately identified. |
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Place of Publication |
Bangalore (India) |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ VAM1999a |
Serial |
1657 |
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| Author |
Ernest Valveny; Enric Marti |
| Title |
Hand-drawn symbol recognition in graphic documents using deformable template matching and a Bayesian framework |
Type |
Conference Article |
| Year |
2000 |
Publication |
Proc. 15th Int Pattern Recognition Conf |
Abbreviated Journal |
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| Volume |
2 |
Issue |
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Pages |
239-242 |
| Keywords |
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| Abstract |
Hand-drawn symbols can take many different and distorted shapes from their ideal representation. Then, very flexible methods are needed to be able to handle unconstrained drawings. We propose here to extend our previous work in hand-drawn symbol recognition based on a Bayesian framework and deformable template matching. This approach gets flexibility enough to fit distorted shapes in the drawing while keeping fidelity to the ideal shape of the symbol. In this work, we define the similarity measure between an image and a symbol based on the distance from every pixel in the image to the lines in the symbol. Matching is carried out using an implementation of the EM algorithm. Thus, we can improve recognition rates and computation time with respect to our previous formulation based on a simulated annealing algorithm. |
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ISBN |
0-7695-0750-6 |
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| Notes |
DAG;IAM; |
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no |
| Call Number |
IAM @ iam @ VAM2000 |
Serial |
1656 |
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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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Thesis |
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| Publisher |
Elsevier Science Inc. |
Place of Publication |
New York, NY, USA |
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Original Title |
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Edition |
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0167-8655 |
ISBN |
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| Notes |
DAG; IAM |
Approved |
no |
| Call Number |
IAM @ iam @ VAM2003 |
Serial |
1653 |
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