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Author Josep Llados; Enric Marti edit  openurl
  Title A graph-edit algorithm for hand-drawn graphical document recognition and their automatic introduction into CAD systems. Type Miscellaneous
  Year 1999 Publication Machine Graphics & Vision, 8(2):195–211. Abbreviated Journal  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LlM1999a Serial 187  
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Author Josep Llados; J. Lopez-Krahe; Enric Marti edit  openurl
  Title A Hough-based method for hatched pattern detection in maps and diagrams. Type Miscellaneous
  Year 1999 Publication Proceedings of the International Conference on Document Analysis and Recognition. Abbreviated Journal  
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  Address Bangalore-India  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LlM1999b Serial 1  
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Author Josep Llados; W. Liu; Jean-Marc Ogier edit  openurl
  Title Seventh IAPR International Workshop on Graphics Recognition GREC 2007 Type Book Whole
  Year 2007 Publication Abbreviated Journal  
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  Address Curitiba (Brazil)  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LLO2007 Serial 835  
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Author Muhammad Muzzamil Luqman; Josep Llados; Jean-Yves Ramel; Thierry Brouard edit  doi
isbn  openurl
  Title A Fuzzy-Interval Based Approach For Explicit Graph Embedding, Recognizing Patterns in Signals, Speech, Images and Video Type Conference Article
  Year 2010 Publication 20th International Conference on Pattern Recognition Abbreviated Journal  
  Volume 6388 Issue Pages 93–98  
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  Abstract We present a new method for explicit graph embedding. Our algorithm extracts a feature vector for an undirected attributed graph. The proposed feature vector encodes details about the number of nodes, number of edges, node degrees, the attributes of nodes and the attributes of edges in the graph. The first two features are for the number of nodes and the number of edges. These are followed by w features for node degrees, m features for k node attributes and n features for l edge attributes — which represent the distribution of node degrees, node attribute values and edge attribute values, and are obtained by defining (in an unsupervised fashion), fuzzy-intervals over the list of node degrees, node attributes and edge attributes. Experimental results are provided for sample data of ICPR2010 contest GEPR.  
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  Publisher Springer, Heidelberg Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title LNCS  
  Series Volume Series Issue Edition  
  ISSN 0302-9743 ISBN 978-3-642-17710-1 Medium  
  Area Expedition Conference ICPR  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LLR2010 Serial 1459  
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Author Josep Llados; Gemma Sanchez edit  openurl
  Title Symbol Recognition Using Graphs Type Miscellaneous
  Year 2003 Publication Proceedings of 10th IEEE International Conference on Image Processing, vol II, 49–52 Abbreviated Journal  
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  Address Barcelona  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LlS2003 Serial 383  
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Author Josep Llados; Gemma Sanchez edit  openurl
  Title Graph Matching vs. Graph Parsing in Graphics Recognition: A Combined Approach Type Journal
  Year 2004 Publication International Journal of Pattern Recognition and Artificial Intelligence Abbreviated Journal IJPRAI  
  Volume 18 Issue 3 Pages 455–473  
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  Notes DAG; IF: 0.588 Approved no  
  Call Number (up) DAG @ dag @ LlS2004 Serial 445  
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Author Josep Llados; Gemma Sanchez edit  openurl
  Title Indexing Historical Documents by Word Shape Signatures Type Conference Article
  Year 2007 Publication 9th International Conference on Document Analysis and Recognition Abbreviated Journal  
  Volume 1 Issue Pages 362–366  
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  Address Curitiba (Brasil)  
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  Area Expedition Conference ICDAR  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LlS2007 Serial 882  
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Author Herve Locteau; Sebastien Mace; Ernest Valveny; Salvatore Tabbone edit  openurl
  Title Extraction des pieces de un plan de habitation Type Conference Article
  Year 2010 Publication Colloque Internacional Francophone de l´Ecrit et le Document Abbreviated Journal  
  Volume Issue Pages 1–12  
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  Abstract In this article, a method to extract the rooms of an architectural floor plan image is described. We first present a line detection algorithm to extract long lines in the image. Those lines are analyzed to identify the existing walls. From this point, room extraction can be seen as a classical segmentation task for which each region corresponds to a room. The chosen resolution strategy consists in recursively decomposing the image until getting nearly convex regions. The notion of convexity is difficult to quantify, and the selection of separation lines can also be rough. Thus, we take advantage of knowledge associated to architectural floor plans in order to obtain mainly rectangular rooms. Preliminary tests on a set of real documents show promising results.  
  Address Sousse, Tunisia  
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  Area Expedition Conference CIFED  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LMV2010 Serial 1440  
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Author Josep Llados; Partha Pratim Roy; Jose Antonio Rodriguez; Gemma Sanchez edit  openurl
  Title Word Spotting in Archive Documents using Shape Contexts Type Book Chapter
  Year 2007 Publication 3rd Iberian Conference on Pattern Recognition and Image Analysis (IbPRIA 2007), J. Marti et al. (Eds.) LNCS 4478:290–297 Abbreviated Journal  
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  Address Girona (Spain)  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LRR2007 Serial 779  
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Author Josep Llados; Gemma Sanchez; Enric Marti edit  openurl
  Title A String-Based Method to Recognize Symbols and Structural Textures in Architectural Plans. Type Miscellaneous
  Year 1997 Publication Second IAPR Workshop on Graphics Recognition, pp. 287–294. Abbreviated Journal  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LSM1997 Serial 44  
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Author Josep Llados; Gemma Sanchez; K. Tombre edit  openurl
  Title An Error-Correction Graph Grammar to Recognize Texture Symbols. Type Miscellaneous
  Year 2002 Publication Graphics Recognition: Algorithms and Apllications, LNCS 2390: 128–138, Springer Verlag. Abbreviated Journal  
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  Address Berlin  
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  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ LST2002 Serial 281  
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Author Joan Mas edit  openurl
  Title Syntactic approaches to recognize bi-dimensional shapes in graphics recognition. Application to sketching interfaces Type Report
  Year 2005 Publication CVC Technical Report #86 Abbreviated Journal  
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  Address CVC (UAB)  
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  Call Number (up) DAG @ dag @ Mas2005a Serial 573  
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Author Joan Mas edit  isbn
openurl 
  Title A Syntactic Pattern Recognition Approach based on a Distribution Tolerant Adjacency Grammar and a Spatial Indexed Parser. Application to Sketched Document Recognition Type Book Whole
  Year 2010 Publication PhD Thesis, Universitat Autonoma de Barcelona-CVC Abbreviated Journal  
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  Abstract Sketch recognition is a discipline which has gained an increasing interest in the last
20 years. This is due to the appearance of new devices such as PDA, Tablet PC’s
or digital pen & paper protocols. From the wide range of sketched documents we
focus on those that represent structured documents such as: architectural floor-plans,
engineering drawing, UML diagrams, etc. To recognize and understand these kinds
of documents, first we have to recognize the different compounding symbols and then
we have to identify the relations between these elements. From the way that a sketch
is captured, there are two categories: on-line and off-line. On-line input modes refer
to draw directly on a PDA or a Tablet PC’s while off-line input modes refer to scan
a previously drawn sketch.
This thesis is an overlapping of three different areas on Computer Science: Pattern
Recognition, Document Analysis and Human-Computer Interaction. The aim of this
thesis is to interpret sketched documents independently on whether they are captured
on-line or off-line. For this reason, the proposed approach should contain the following
features. First, as we are working with sketches the elements present in our input
contain distortions. Second, as we would work in on-line or off-line input modes, the
order in the input of the primitives is indifferent. Finally, the proposed method should
be applied in real scenarios, its response time must be slow.
To interpret a sketched document we propose a syntactic approach. A syntactic
approach is composed of two correlated components: a grammar and a parser. The
grammar allows describing the different elements on the document as well as their
relations. The parser, given a document checks whether it belongs to the language
generated by the grammar or not. Thus, the grammar should be able to cope with
the distortions appearing on the instances of the elements. Moreover, it would be
necessary to define a symbol independently of the order of their primitives. Concerning to the parser when analyzing 2D sentences, it does not assume an order in the
primitives. Then, at each new primitive in the input, the parser searches among the
previous analyzed symbols candidates to produce a valid reduction.
Taking into account these features, we have proposed a grammar based on Adjacency Grammars. This kind of grammars defines their productions as a multiset
of symbols rather than a list. This allows describing a symbol without an order in
their components. To cope with distortion we have proposed a distortion model.
This distortion model is an attributed estimated over the constraints of the grammar and passed through the productions. This measure gives an idea on how far is the
symbol from its ideal model. In addition to the distortion on the constraints other
distortions appear when working with sketches. These distortions are: overtracing,
overlapping, gaps or spurious strokes. Some grammatical productions have been defined to cope with these errors. Concerning the recognition, we have proposed an
incremental parser with an indexation mechanism. Incremental parsers analyze the
input symbol by symbol given a response to the user when a primitive is analyzed.
This makes incremental parser suitable to work in on-line as well as off-line input
modes. The parser has been adapted with an indexation mechanism based on a spatial division. This indexation mechanism allows setting the primitives in the space
and reducing the search to a neighbourhood.
A third contribution is a grammatical inference algorithm. This method given a
set of symbols captures the production describing it. In the field of formal languages,
different approaches has been proposed but in the graphical domain not so much work
is done in this field. The proposed method is able to capture the production from
a set of symbol although they are drawn in different order. A matching step based
on the Haussdorff distance and the Hungarian method has been proposed to match
the primitives of the different symbols. In addition the proposed approach is able to
capture the variability in the parameters of the constraints.
From the experimental results, we may conclude that we have proposed a robust
approach to describe and recognize sketches. Moreover, the addition of new symbols
to the alphabet is not restricted to an expert. Finally, the proposed approach has
been used in two real scenarios obtaining a good performance.		  
  Address  
  Corporate Author Thesis Ph.D. thesis  
  Publisher Ediciones Graficas Rey Place of Publication Editor Gemma Sanchez;Josep Llados  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN 978-84-937261-4-0 Medium  
  Area Expedition Conference  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ Mas2010 Serial 1334  
Permanent link to this record
 
 
Author Joan Mas; J.A. Jorge; Gemma Sanchez; Josep Llados edit  openurl
  Title Describing and Parising Hand-Drawn Sketches using a Syntactic Approach Type Conference Article
  Year 2007 Publication Seventh IAPR International Workshop on Graphics Recognition Abbreviated Journal  
  Volume Issue Pages 61–62  
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  Abstract  
  Address Curitiba (Brasil)  
  Corporate Author Thesis  
  Publisher Place of Publication Editor J. Llados, W. Liu, J.M. Ogier  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference GREC  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ MJS2007 Serial 845  
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Author Joan Mas; J.A. Jorge; Gemma Sanchez; Josep Llados edit  openurl
  Title Representing and Parsing Sketched Symbols using Adjacency Grammars and a Grid-Directed Parser Type Book Chapter
  Year 2008 Publication Graphics Recognition: Recent Advances and New Opportunities, Abbreviated Journal  
  Volume 5046 Issue Pages 176–187  
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  Abstract  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor W. Liu, J. Llados, J.M. Ogier  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title LNCS  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes DAG Approved no  
  Call Number (up) DAG @ dag @ MJS2008 Serial 991  
Permanent link to this record
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