| Records |
| Author |
Josep Llados; Ernest Valveny; Gemma Sanchez; Enric Marti |
| Title |
A Case Study of Pattern Recognition: Symbol Recognition in Graphic Documentsa |
Type |
Conference Article |
| Year |
2003 |
Publication |
Proceedings of Pattern Recognition in Information Systems |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
1-13 |
| Keywords |
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| Abstract |
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| Address |
Angers, France |
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Thesis |
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| Publisher |
ICEIS Press |
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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| ISSN |
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ISBN |
972-98816-3-4 |
Medium |
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Expedition |
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Conference |
PRIS'03 |
| Notes |
DAG;IAM; |
Approved |
no |
Call Number  |
IAM @ iam @ LVS2003 |
Serial |
1576 |
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| Author |
Josep Llados; Ernest Valveny; Gemma Sanchez; Enric Marti |
| Title |
Symbol recognition: current advances and perspectives |
Type |
Book Chapter |
| Year |
2002 |
Publication |
Graphics Recognition Algorithms And Applications |
Abbreviated Journal |
LNCS |
| Volume |
2390 |
Issue |
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Pages |
104-128 |
| Keywords |
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| Abstract |
The recognition of symbols in graphic documents is an intensive research activity in the community of pattern recognition and document analysis. A key issue in the interpretation of maps, engineering drawings, diagrams, etc. is the recognition of domain dependent symbols according to a symbol database. In this work we first review the most outstanding symbol recognition methods from two different points of view: application domains and pattern recognition methods. In the second part of the paper, open and unaddressed problems involved in symbol recognition are described, analyzing their current state of art and discussing future research challenges. Thus, issues such as symbol representation, matching, segmentation, learning, scalability of recognition methods and performance evaluation are addressed in this work. Finally, we discuss the perspectives of symbol recognition concerning to new paradigms such as user interfaces in handheld computers or document database and WWW indexing by graphical content. |
| Address |
London, UK |
| Corporate Author |
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Thesis |
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| Publisher |
Springer-Verlag |
Place of Publication |
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Editor |
Dorothea Blostein and Young- Bin Kwon |
| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
Lecture Notes in Computer Science |
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 |
3-540-44066-6 |
Medium |
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Expedition |
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Conference |
GREC |
| Notes |
DAG; IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ LVS2002 |
Serial |
1572 |
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| Author |
Josep Llados; Ernest Valveny; Enric Marti |
| Title |
Symbol Recognition in Document Image Analysis: Methods and Challenges |
Type |
Journal Article |
| Year |
2000 |
Publication |
Recent Research Developments in Pattern Recognition, Transworld Research Network, |
Abbreviated Journal |
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| Volume |
1 |
Issue |
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Pages |
151–178. |
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| Abstract |
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Series Issue |
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Edition |
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| ISSN |
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ISBN |
81-86846-61-1 |
Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
DAG;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LVM2000 |
Serial |
1575 |
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| Author |
Ole Vilhelm-Larsen; Petia Radeva; Enric Marti |
| Title |
Guidelines for choosing optimal parameters of elasticity for snakes |
Type |
Book Chapter |
| Year |
1995 |
Publication |
Computer Analysis Of Images And Patterns |
Abbreviated Journal |
LNCS |
| Volume |
970 |
Issue |
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Pages |
106-113 |
| Keywords |
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| Abstract |
This paper proposes a guidance in the process of choosing and using the parameters of elasticity of a snake in order to obtain a precise segmentation. A new two step procedure is defined based on upper and lower bounds on the parameters. Formulas, by which these bounds can be calculated for real images where parts of the contour may be missing, are presented. Experiments on segmentation of bone structures in X-ray images have verified the usefulness of the new procedure. |
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Series Title |
Lecture Notes in Computer Science |
Abbreviated Series Title |
LNCS |
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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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| Area |
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Expedition |
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Conference |
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| Notes |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LRM1995b |
Serial |
1558 |
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| Author |
Ole Larsen; Petia Radeva; Enric Marti |
| Title |
Bounds on the optimal elasticity parameters for a snake |
Type |
Journal Article |
| Year |
1995 |
Publication |
Image Analysis and Processing |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
37-42 |
| Keywords |
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| Abstract |
This paper develops a formalism by which an estimate for the upper and lower bounds for the elasticity parameters for a snake can be obtained. Objects different in size and shape give rise to different bounds. The bounds can be obtained based on an analysis of the shape of the object of interest. Experiments on synthetic images show a good correlation between the estimated behaviour of the snake and the one actually observed. Experiments on real X-ray images show that the parameters for optimal segmentation lie within the estimated bounds. |
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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 |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LRM1995a |
Serial |
1559 |
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| Author |
Ole Larsen; Petia Radeva; Enric Marti |
| Title |
Calculating the Bounds on the Optimal Parameters of Elasticity for a Snake |
Type |
Report |
| Year |
1994 |
Publication |
Technical Report |
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 |
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| Address |
Aalborg University |
| Corporate Author |
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Thesis |
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| Publisher |
Aalborg University, Laboratory of image Analysis. |
Place of Publication |
Denmark |
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Aalborg University, Laboratory of image Analysis. |
Expedition |
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Conference |
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| Notes |
MILAB;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LRM1994 |
Serial |
1560 |
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| Author |
Josep Llados; Enric Marti; Juan J.Villanueva |
| Title |
Symbol recognition by error-tolerant subgraph matching between region adjacency graphs |
Type |
Journal Article |
| Year |
2001 |
Publication |
IEEE Transactions on Pattern Analysis and Machine Intelligence |
Abbreviated Journal |
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| Volume |
23 |
Issue |
10 |
Pages |
1137-1143 |
| Keywords |
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| Abstract |
The recognition of symbols in graphic documents is an intensive research activity in the community of pattern recognition and document analysis. A key issue in the interpretation of maps, engineering drawings, diagrams, etc. is the recognition of domain dependent symbols according to a symbol database. In this work we first review the most outstanding symbol recognition methods from two different points of view: application domains and pattern recognition methods. In the second part of the paper, open and unaddressed problems involved in symbol recognition are described, analyzing their current state of art and discussing future research challenges. Thus, issues such as symbol representation, matching, segmentation, learning, scalability of recognition methods and performance evaluation are addressed in this work. Finally, we discuss the perspectives of symbol recognition concerning to new paradigms such as user interfaces in handheld computers or document database and WWW indexing by graphical content. |
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Conference |
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| Notes |
DAG;IAM;ISE; |
Approved |
no |
| Call Number |
IAM @ iam @ LMV2001 |
Serial |
1581 |
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| Author |
Josep Llados; Enric Marti; Jordi Regincos |
| Title |
Interpretación de diseños a mano alzada como técnica de entrada a un sistema CAD en un ámbito de arquitectura |
Type |
Conference Article |
| Year |
1993 |
Publication |
III National Conference on Computer Graphics |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Abstract |
En los últimos años, se ha introducido ámpliamente el uso de los sistemas CAD en dominios relacionados con la arquitectura. Dichos sistemas CAD son muy útiles para el arquitecto en el diseño de planos de plantas de edificios. Sin embargo, la utilización eficiente de un CAD requiere un tiempo de aprendizaje, en especial, en la etapa de creación y edición del diseño. Además, una vez familiarizado con un CAD, el arquitecto debe adaptarse a la simbología que éste le permite que, en algunos casos puede ser poco flexible.Con esta motivación, se propone una técnica alternativa de entrada de documentos en sistemas CAD. Dicha técnica se basa en el diseño del plano sobre papel mediante un dibujo lineal hecho a mano alzada a modo de boceto e introducido mediante scanner. Una vez interpretado este dibujo inicial e introducido en el CAD, el arquitecto sólo deber hacer sobre éste los retoques finales del documento.El sistema de entrada propuesto se compone de dos módulos principales: En primer lugar, la extracción de características (puntos característicos, rectas y arcos) de la imagen obtenida mediante scanner. En dicho módulo se aplican principalmente técnicas de procesamiento de imágenes obteniendo como resultado una representaci¢n del dibujo de entrada basada en grafos de atributos. El objetivo del segundo módulo es el de encontrar y reconocer las entidades integrantes del documento (puertas, mesas, etc.) en base a una biblioteca de símbolos definida en el sistema CAD. La implementación de dicho módulo se basa en técnicas de isomorfismo de grafos.El sistema propone una alternativa que permita, mediante el diseño a mano alzada, la introducción de la informaci¢n m s significativa del plano de forma rápida, sencilla y estandarizada por parte del usuario. |
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Place of Publication |
Granada |
Editor |
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Original Title |
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Conference |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ LMR1993 |
Serial |
1571 |
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| Author |
Josep Llados; Jaime Lopez-Krahe; Gemma Sanchez; Enric Marti |
| Title |
Interprétation de cartes et plans par mise en correspondance de graphes de attributs |
Type |
Conference Article |
| Year |
2000 |
Publication |
12 Congrès Francophone AFRIF–AFIA |
Abbreviated Journal |
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| Volume |
3 |
Issue |
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Pages |
225-234 |
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Conference |
RFIA |
| Notes |
DAG;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LLS2000 |
Serial |
1567 |
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| Author |
Jaime Lopez-Krahe; Josep Llados; Enric Marti |
| Title |
Architectural Floor Plan Analysis |
Type |
Report |
| Year |
2000 |
Publication |
CVonline |
Abbreviated Journal |
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Issue |
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Pages |
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| Address |
Edimburg, UK |
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| Publisher |
University of Edinburgh |
Place of Publication |
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Editor |
Robert B. Fisher |
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Medium |
online pdf |
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Conference |
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| Notes |
DAG;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LLM2000 |
Serial |
1561 |
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| Author |
Josep Llados; Jaime Lopez-Krahe; Enric Marti |
| Title |
A system to understand hand-drawn floor plans using subgraph isomorphism and Hough transform |
Type |
Book Chapter |
| Year |
1997 |
Publication |
Machine Vision and Applications |
Abbreviated Journal |
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| Volume |
10 |
Issue |
3 |
Pages |
150-158 |
| Keywords |
Line drawings – Hough transform – Graph matching – CAD systems – Graphics recognition |
| Abstract |
Presently, man-machine interface development is a widespread research activity. A system to understand hand drawn architectural drawings in a CAD environment is presented in this paper. To understand a document, we have to identify its building elements and their structural properties. An attributed graph structure is chosen as a symbolic representation of the input document and the patterns to recognize in it. An inexact subgraph isomorphism procedure using relaxation labeling techniques is performed. In this paper we focus on how to speed up the matching. There is a building element, the walls, characterized by a hatching pattern. Using a straight line Hough transform (SLHT)-based method, we recognize this pattern, characterized by parallel straight lines, and remove from the input graph the edges belonging to this pattern. The isomorphism is then applied to the remainder of the input graph. When all the building elements have been recognized, the document is redrawn, correcting the inaccurate strokes obtained from a hand-drawn input. |
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| Notes |
DAG;IAM |
Approved |
no |
| Call Number |
IAM @ iam @ LLM1997a |
Serial |
1566 |
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| Author |
Josep Llados; Enric Marti |
| Title |
Playing with error-tolerant subgraph isomorphism in line drawings |
Type |
Conference Article |
| Year |
1997 |
Publication |
VII National Symposium on Pattern Recognition and image Analysis |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ LlM1997 |
Serial |
1570 |
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| Author |
Josep Llados; Jaime Lopez-Krahe; Enric Marti |
| Title |
Hand drawn document understanding using the straight line Hough transform and graph matching |
Type |
Conference Article |
| Year |
1996 |
Publication |
Proceedings of the 13th International Pattern Recognition Conference (ICPR’96) |
Abbreviated Journal |
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| Volume |
2 |
Issue |
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Pages |
497-501 |
| Keywords |
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| Abstract |
This paper presents a system to understand hand drawn architectural drawings in a CAD environment. The procedure is to identify in a floor plan the building elements, stored in a library of patterns, and their spatial relationships. The vectorized input document and the patterns to recognize are represented by attributed graphs. To recognize the patterns as such, we apply a structural approach based on subgraph isomorphism techniques. In spite of their value, graph matching techniques do not recognize adequately those building elements characterized by hatching patterns, i.e. walls. Here we focus on the recognition of hatching patterns and develop a straight line Hough transform based method in order to detect the regions filled in with parallel straight fines. This allows not only to recognize filling patterns, but it actually reduces the computational load associated with the subgraph isomorphism computation. The result is that the document can be redrawn by editing all the patterns recognized |
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Vienna , Austria |
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| Notes |
DAG;IAM; |
Approved |
no |
| Call Number |
IAM @ iam @ LLM1996 |
Serial |
1579 |
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| Author |
Josep Llados; Enric Marti |
| Title |
Interpretacio de dibuixos lineals mitjançant tècniques d isomorfisme entre grafs |
Type |
Conference Article |
| Year |
1995 |
Publication |
Trobada de Joves Investigadors |
Abbreviated Journal |
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L’anàlisi de documents té com a objectiu la interpretació automàtica de documents impresos sobre paper, amb la finalitat d’obtenir una descripció simbòlica d’aquests, que permeti el seu emmagatzemament i posterior tractament computacional. Les tècniques basades en grafs relacionals d’atributs permeten representar de manera compacta la informació continguda en dibuixos lineals i mitjançant mecanismes d’isomorfisme entre grafs, reconèixer-hi certes estructures i d’aquesta manera, interpretar el document. En aquest treball es dóna una visió general de les tènciques de grafs aplicades al reconeixement visual d’objectes en problemes d’anàlisi de documents. Aquestes tècniques s’il·lustren amb un exemple de reconeixement de plànols dibuixats a mà alçada. Finalment es proposa la utilització de tècniques de Hough com a mecanisme per accelerar el procés de reconeixement aplicant un cert coneixement sobre el domini en el que es treballa |
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| Notes |
DAG;IAM |
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no |
| Call Number |
IAM @ iam @ LlM1995 |
Serial |
1578 |
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| Author |
Josep Llados; Enric Marti |
| Title |
Graph-edit algorithms for hand-drawn graphical document recognition and their automatic introduction |
Type |
Journal Article |
| Year |
1999 |
Publication |
Machine Graphics & Vision journal, special issue on Graph transformation |
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DAG;IAM |
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IAM @ iam @ LIM1999c |
Serial |
1569 |
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