Records |
Author |
Debora Gil; Jaume Garcia; Ruth Aris; Guillaume Houzeaux; Manuel Vazquez |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Riemmanian approach to cardiac fiber architecture modelling |
Type |
Conference Article |
Year |
2009 |
Publication |
1st International Conference on Mathematical & Computational Biomedical Engineering |
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Volume |
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Issue |
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Pages |
59-62 |
Keywords |
cardiac fiber architecture; diffusion tensor magnetic resonance imaging; differential (Rie- mannian) geometry. |
Abstract |
There is general consensus that myocardial fiber architecture should be modelled in order to fully understand the electromechanical properties of the Left Ventricle (LV). Diffusion Tensor magnetic resonance Imaging (DTI) is the reference image modality for rapid measurement of fiber orientations by means of the tensor principal eigenvectors. In this work, we present a mathematical framework for across subject comparison of the local geometry of the LV anatomy including the fiber architecture from the statistical analysis of DTI studies. We use concepts of differential geometry for defining a parametric domain suitable for statistical analysis of a low number of samples. We use Riemannian metrics to define a consistent computation of DTI principal eigenvector modes of variation. Our framework has been applied to build an atlas of the LV fiber architecture from 7 DTI normal canine hearts. |
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Swansea (UK) |
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Nithiarasu, R.L.R.V.L. |
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CMBE |
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IAM |
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no |
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IAM @ iam @ FGA2009 |
Serial |
1520 |
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Author |
Oriol Ramos Terrades; Salvatore Tabbone; Ernest Valveny |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Review of Shape Descriptors for Document Analysis |
Type |
Conference Article |
Year |
2007 |
Publication |
9th International Conference on Document Analysis and Recognition |
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Volume |
1 |
Issue |
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Pages |
227–231 |
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Curitiba (Brazil) |
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ICDAR |
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DAG |
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no |
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DAG @ dag @ RTV2007b |
Serial |
884 |
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Author |
Debora Gil; Petia Radeva |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Regularized Curvature Flow Designed for a Selective Shape Restoration |
Type |
Journal Article |
Year |
2004 |
Publication |
IEEE Transactions on Image Processing |
Abbreviated Journal |
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Volume |
13 |
Issue |
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Pages |
1444–1458 |
Keywords |
Geometric flows, nonlinear filtering, shape recovery. |
Abstract |
Among all filtering techniques, those based exclu- sively on image level sets (geometric flows) have proven to be the less sensitive to the nature of noise and the most contrast preserving. A common feature to existent curvature flows is that they penalize high curvature, regardless of the curve regularity. This constitutes a major drawback since curvature extreme values are standard descriptors of the contour geometry. We argue that an operator designed with shape recovery purposes should include a term penalizing irregularity in the curvature rather than its magnitude. To this purpose, we present a novel geometric flow that includes a function that measures the degree of local irregularity present in the curve. A main advantage is that it achieves non-trivial steady states representing a smooth model of level curves in a noisy image. Performance of our approach is compared to classical filtering techniques in terms of quality in the restored image/shape and asymptotic behavior. We empirically prove that our approach is the technique that achieves the best compromise between image quality and evolution stabilization. |
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IAM;MILAB |
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no |
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BCNPCL @ bcnpcl @ GiR2004b |
Serial |
491 |
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Author |
Marçal Rusiñol; Josep Llados |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Region-Based Hashing Approach for Symbol Spotting in Thechnical Documents |
Type |
Conference Article |
Year |
2007 |
Publication |
Seventh IAPR International Workshop on Graphics Recognition |
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Pages |
41–42 |
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Curitiba (Brazil) |
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J. Llados, W. Liu, J.M. Ogier |
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GREC |
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DAG |
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no |
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DAG @ dag @ RuL2007a |
Serial |
846 |
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Author |
Marçal Rusiñol; Josep Llados |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Region-Based Hashing Approach for Symbol Spotting in Technical Documents |
Type |
Book Chapter |
Year |
2008 |
Publication |
Graphics Recognition: Recent Advances and New Opportunities |
Abbreviated Journal |
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Volume |
5046 |
Issue |
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Pages |
104–113 |
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W. Lius, J. Llados, J.M. Ogier |
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LNCS |
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DAG |
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DAG @ dag @ RuL2008a |
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959 |
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Author |
Jorge Bernal; F. Javier Sanchez; Fernando Vilariño |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Region Segmentation Method for Colonoscopy Images Using a Model of Polyp Appearance |
Type |
Conference Article |
Year |
2011 |
Publication |
5th Iberian Conference on Pattern Recognition and Image Analysis |
Abbreviated Journal |
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Volume |
6669 |
Issue |
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Pages |
134-143 |
Keywords |
Colonoscopy, Polyp Detection, Region Merging, Region Segmentation. |
Abstract |
This work aims at the segmentation of colonoscopy images into a minimum number of informative regions. Our method performs in a way such, if a polyp is present in the image, it will be exclusively and totally contained in a single region. This result can be used in later stages to classify regions as polyp-containing candidates. The output of the algorithm also defines which regions can be considered as non-informative. The algorithm starts with a high number of initial regions and merges them taking into account the model of polyp appearance obtained from available data. The results show that our segmentations of polyp regions are more accurate than state-of-the-art methods. |
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Las Palmas de Gran Canaria, June 2011 |
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SpringerLink |
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Vitrià, Jordi and Sanches, João and Hernández, Mario |
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Lecture Notes in Computer Science |
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ISBN |
978-3-642-21256-7 |
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800 |
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Conference |
IbPRIA |
Notes |
MV;SIAI |
Approved |
no |
Call Number |
IAM @ iam @ BSV2011c |
Serial |
1696 |
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Author |
Katerine Diaz; Aura Hernandez-Sabate; Antonio Lopez |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A reduced feature set for driver head pose estimation |
Type |
Journal Article |
Year |
2016 |
Publication |
Applied Soft Computing |
Abbreviated Journal |
ASOC |
Volume |
45 |
Issue |
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Pages |
98-107 |
Keywords |
Head pose estimation; driving performance evaluation; subspace based methods; linear regression |
Abstract |
Evaluation of driving performance is of utmost importance in order to reduce road accident rate. Since driving ability includes visual-spatial and operational attention, among others, head pose estimation of the driver is a crucial indicator of driving performance. This paper proposes a new automatic method for coarse and fine head's yaw angle estimation of the driver. We rely on a set of geometric features computed from just three representative facial keypoints, namely the center of the eyes and the nose tip. With these geometric features, our method combines two manifold embedding methods and a linear regression one. In addition, the method has a confidence mechanism to decide if the classification of a sample is not reliable. The approach has been tested using the CMU-PIE dataset and our own driver dataset. Despite the very few facial keypoints required, the results are comparable to the state-of-the-art techniques. The low computational cost of the method and its robustness makes feasible to integrate it in massive consume devices as a real time application. |
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ADAS; 600.085; 600.076; |
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no |
Call Number |
Admin @ si @ DHL2016 |
Serial |
2760 |
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Author |
Miquel Ferrer; Dimosthenis Karatzas; Ernest Valveny; Horst Bunke |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Recursive Embedding Approach to Median Graph Computation |
Type |
Conference Article |
Year |
2009 |
Publication |
7th IAPR – TC–15 Workshop on Graph–Based Representations in Pattern Recognition |
Abbreviated Journal |
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Volume |
5534 |
Issue |
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Pages |
113–123 |
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Abstract |
The median graph has been shown to be a good choice to infer a representative of a set of graphs. It has been successfully applied to graph-based classification and clustering. Nevertheless, its computation is extremely complex. Several approaches have been presented up to now based on different strategies. In this paper we present a new approximate recursive algorithm for median graph computation based on graph embedding into vector spaces. Preliminary experiments on three databases show that this new approach is able to obtain better medians than the previous existing approaches. |
Address |
Venice, Italy |
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Springer Berlin Heidelberg |
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LNCS |
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0302-9743 |
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978-3-642-02123-7 |
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GBR |
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DAG |
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no |
Call Number |
DAG @ dag @ FKV2009 |
Serial |
1173 |
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Author |
Gerard Canal; Sergio Escalera; Cecilio Angulo |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Real-time Human-Robot Interaction system based on gestures for assistive scenarios |
Type |
Journal Article |
Year |
2016 |
Publication |
Computer Vision and Image Understanding |
Abbreviated Journal |
CVIU |
Volume |
149 |
Issue |
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Pages |
65-77 |
Keywords |
Gesture recognition; Human Robot Interaction; Dynamic Time Warping; Pointing location estimation |
Abstract |
Natural and intuitive human interaction with robotic systems is a key point to develop robots assisting people in an easy and effective way. In this paper, a Human Robot Interaction (HRI) system able to recognize gestures usually employed in human non-verbal communication is introduced, and an in-depth study of its usability is performed. The system deals with dynamic gestures such as waving or nodding which are recognized using a Dynamic Time Warping approach based on gesture specific features computed from depth maps. A static gesture consisting in pointing at an object is also recognized. The pointed location is then estimated in order to detect candidate objects the user may refer to. When the pointed object is unclear for the robot, a disambiguation procedure by means of either a verbal or gestural dialogue is performed. This skill would lead to the robot picking an object in behalf of the user, which could present difficulties to do it by itself. The overall system — which is composed by a NAO and Wifibot robots, a KinectTM v2 sensor and two laptops — is firstly evaluated in a structured lab setup. Then, a broad set of user tests has been completed, which allows to assess correct performance in terms of recognition rates, easiness of use and response times. |
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Elsevier B.V. |
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HuPBA;MILAB; |
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no |
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Admin @ si @ CEA2016 |
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2768 |
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Author |
Guillermo Torres; Debora Gil; Antonio Rosell; Sonia Baeza; Carles Sanchez |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A radiomic biopsy for virtual histology of pulmonary nodules |
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Conference Article |
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2023 |
Publication |
IEEE International Symposium on Biomedical Imaging |
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Pòster |
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Cartagena de Indias; Colombia; April 2023 |
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ISBI |
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IAM |
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no |
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Admin @ si @ TGR2023b |
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3954 |
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Author |
Maurizio Mencuccini; Jordi Martinez-Vilalta; Josep Piñol; Lasse Loepfe; Mireia Burnat ; Xavier Alvarez; Juan Camacho; Debora Gil |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A quantitative and statistically robust method for the determination of xylem conduit spatial distribution |
Type |
Journal Article |
Year |
2010 |
Publication |
American Journal of Botany |
Abbreviated Journal |
AJB |
Volume |
97 |
Issue |
8 |
Pages |
1247-1259 |
Keywords |
Geyer; hydraulic conductivity; point pattern analysis; Ripley; Spatstat; vessel clusters; xylem anatomy; xylem network |
Abstract |
Premise of the study: Because of their limited length, xylem conduits need to connect to each other to maintain water transport from roots to leaves. Conduit spatial distribution in a cross section plays an important role in aiding this connectivity. While indices of conduit spatial distribution already exist, they are not well defined statistically. * Methods: We used point pattern analysis to derive new spatial indices. One hundred and five cross-sectional images from different species were transformed into binary images. The resulting point patterns, based on the locations of the conduit centers-of-area, were analyzed to determine whether they departed from randomness. Conduit distribution was then modeled using a spatially explicit stochastic model. * Key results: The presence of conduit randomness, uniformity, or aggregation depended on the spatial scale of the analysis. The large majority of the images showed patterns significantly different from randomness at least at one spatial scale. A strong phylogenetic signal was detected in the spatial variables. * Conclusions: Conduit spatial arrangement has been largely conserved during evolution, especially at small spatial scales. Species in which conduits were aggregated in clusters had a lower conduit density compared to those with uniform distribution. Statistically sound spatial indices must be employed as an aid in the characterization of distributional patterns across species and in models of xylem water transport. Point pattern analysis is a very useful tool in identifying spatial patterns. |
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IAM; |
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IAM @ iam @ MMG2010 |
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1623 |
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Author |
M. Visani; Oriol Ramos Terrades; Salvatore Tabbone |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Protocol to Characterize the Descriptive Power and the Complementarity of Shape Descriptors |
Type |
Journal Article |
Year |
2011 |
Publication |
International Journal on Document Analysis and Recognition |
Abbreviated Journal |
IJDAR |
Volume |
14 |
Issue |
1 |
Pages |
87-100 |
Keywords |
Document analysis; Shape descriptors; Symbol description; Performance characterization; Complementarity analysis |
Abstract |
Most document analysis applications rely on the extraction of shape descriptors, which may be grouped into different categories, each category having its own advantages and drawbacks (O.R. Terrades et al. in Proceedings of ICDAR’07, pp. 227–231, 2007). In order to improve the richness of their description, many authors choose to combine multiple descriptors. Yet, most of the authors who propose a new descriptor content themselves with comparing its performance to the performance of a set of single state-of-the-art descriptors in a specific applicative context (e.g. symbol recognition, symbol spotting...). This results in a proliferation of the shape descriptors proposed in the literature. In this article, we propose an innovative protocol, the originality of which is to be as independent of the final application as possible and which relies on new quantitative and qualitative measures. We introduce two types of measures: while the measures of the first type are intended to characterize the descriptive power (in terms of uniqueness, distinctiveness and robustness towards noise) of a descriptor, the second type of measures characterizes the complementarity between multiple descriptors. Characterizing upstream the complementarity of shape descriptors is an alternative to the usual approach where the descriptors to be combined are selected by trial and error, considering the performance characteristics of the overall system. To illustrate the contribution of this protocol, we performed experimental studies using a set of descriptors and a set of symbols which are widely used by the community namely ART and SC descriptors and the GREC 2003 database. |
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DAG; IF 1.091 |
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no |
Call Number |
Admin @ si @VRT2011 |
Serial |
1856 |
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Author |
Salvatore Tabbone; Josep Llados |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Propos de la Reconnaissance de Documents Graphiques: Synthese et Perspectives |
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Conference Article |
Year |
2007 |
Publication |
Traitement et Analyse de l’Information: Methodes et Applications |
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Pages |
247–258 |
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Address |
Hammamet (Tunis) |
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TAIMA’07 |
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DAG |
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no |
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DAG @ dag @ TaL2007 |
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890 |
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Author |
Anjan Dutta; Josep Llados; Horst Bunke; Umapada Pal |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Product graph based method for dual subgraph matching applied to symbol spotting |
Type |
Conference Article |
Year |
2013 |
Publication |
10th IAPR International Workshop on Graphics Recognition |
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Abstract |
Product graph has been shown to be an efficient way for matching subgraphs. This paper reports the extension of the product graph methodology for subgraph matching applied to symbol spotting in graphical documents. This paper focuses on the two major limitations of the previous version of product graph: (1) Spurious nodes and edges in the graph representation and (2) Inefficient node and edge attributes. To deal with noisy information of vectorized graphical documents, we consider a dual graph representation on the original graph representing the graphical information and the product graph is computed between the dual graphs of the query graphs and the input graph.
The dual graph with redundant edges is helpful for efficient and tolerating encoding of the structural information of the graphical documents. The adjacency matrix of the product graph locates similar path information of two graphs and exponentiating the adjacency matrix finds similar paths of greater lengths. Nodes joining similar paths between two graphs are found by combining different exponentials of adjacency matrices. An experimental investigation reveals that the recall obtained by this approach is quite encouraging. |
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Bethlehem; PA; USA; August 2013 |
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GREC |
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DAG |
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no |
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Admin @ si @ DLB2013b |
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2359 |
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Author |
Anjan Dutta; Josep Llados; Horst Bunke; Umapada Pal |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
A Product Graph Based Method for Dual Subgraph Matching Applied to Symbol Spotting |
Type |
Book Chapter |
Year |
2014 |
Publication |
Graphics Recognition. Current Trends and Challenges |
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Volume |
8746 |
Issue |
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Pages |
7-11 |
Keywords |
Product graph; Dual edge graph; Subgraph matching; Random walks; Graph kernel |
Abstract |
Product graph has been shown as a way for matching subgraphs. This paper reports the extension of the product graph methodology for subgraph matching applied to symbol spotting in graphical documents. Here we focus on the two major limitations of the previous version of the algorithm: (1) spurious nodes and edges in the graph representation and (2) inefficient node and edge attributes. To deal with noisy information of vectorized graphical documents, we consider a dual edge graph representation on the original graph representing the graphical information and the product graph is computed between the dual edge graphs of the pattern graph and the target graph. The dual edge graph with redundant edges is helpful for efficient and tolerating encoding of the structural information of the graphical documents. The adjacency matrix of the product graph locates the pair of similar edges of two operand graphs and exponentiating the adjacency matrix finds similar random walks of greater lengths. Nodes joining similar random walks between two graphs are found by combining different weighted exponentials of adjacency matrices. An experimental investigation reveals that the recall obtained by this approach is quite encouraging. |
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Springer Berlin Heidelberg |
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Editor |
Bart Lamiroy; Jean-Marc Ogier |
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LNCS |
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0302-9743 |
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978-3-662-44853-3 |
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DAG; 600.077 |
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no |
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Admin @ si @ DLB2014 |
Serial |
2698 |
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