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Author Josep Llados; Enric Marti edit  openurl
  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 Abbreviated Journal  
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  Notes DAG;IAM; Approved no  
  Call Number IAM @ iam @ LlM1997 Serial (down) 1570  
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Author Josep Llados; Enric Marti edit  openurl
  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 Abbreviated Journal  
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  Notes DAG;IAM Approved no  
  Call Number IAM @ iam @ LIM1999c Serial (down) 1569  
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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 Journal Article
  Year 1999 Publication Machine Graphics & Vision Abbreviated Journal  
  Volume 8 Issue Pages 195-211  
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  Notes DAG;IAM; Approved no  
  Call Number IAM @ iam @ LIM1999 Serial (down) 1568  
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Author Josep Llados; Jaime Lopez-Krahe; Gemma Sanchez; Enric Marti edit  openurl
  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  
  Volume 3 Issue Pages 225-234  
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  Area Expedition Conference RFIA  
  Notes DAG;IAM Approved no  
  Call Number IAM @ iam @ LLS2000 Serial (down) 1567  
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Author Josep Llados; Jaime Lopez-Krahe; Enric Marti edit   pdf
doi  openurl
  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  
  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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  Area Expedition Conference  
  Notes DAG;IAM Approved no  
  Call Number IAM @ iam @ LLM1997a Serial (down) 1566  
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Author Josep Llados; Horst Bunke; Enric Marti edit   pdf
openurl 
  Title Structural Recognition of hand drawn floor plans Type Conference Article
  Year 1996 Publication VI National Symposium on Pattern Recognition and Image Analysis Abbreviated Journal  
  Volume Issue Pages  
  Keywords Rotational Symmetry; Reflectional Symmetry; String Matching.  
  Abstract A system to recognize hand drawn architectural drawings in a CAD environment has been deve- loped. In this paper we focus on its high level interpretation module. To interpret a floor plan, the system must identify several building elements, whose description is stored in a library of pat- terns, as well as their spatial relationships. We propose a structural approach based on subgraph isomorphism techniques to obtain a high-level interpretation of the document. The vectorized input document and the patterns to be recognized are represented by attributed graphs. Discrete relaxation techniques (AC4 algorithm) have been applied to develop the matching algorithm. The process has been divided in three steps: node labeling, local consistency and global consistency verification. The hand drawn creation causes disturbed line drawings with several accuracy errors, which must be taken into account. Here we have identified them and the AC4 algorithm has been adapted to manage them.  
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  Publisher Place of Publication Cordoba Editor  
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  Area Expedition Conference  
  Notes DAG;IAM; Approved no  
  Call Number IAM @ iam @ LIM1995 Serial (down) 1565  
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Author Josep Llados; Horst Bunke; Enric Marti edit  doi
openurl 
  Title Using cyclic string matching to find rotational and reflectional symmetric shapes Type Conference Article
  Year 1996 Publication Intelligent Robots: Sensing, Modeling and Planning (Dagstuhl Workshop) Abbreviated Journal  
  Volume Issue Pages 164-179  
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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 (down) 1564  
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Author Josep Llados;Horst Bunke; Enric Marti edit  url
isbn  openurl
  Title Using Cyclic String Matching to Find Rotational and Reflectional Symmetries in Shapes Type Conference Article
  Year 1997 Publication Intelligent Robots: Sensing, Modeling and Planning Abbreviated Journal  
  Volume Issue Pages 164-179  
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  Abstract Dagstuhl Workshop  
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  Publisher World Scientific Press Place of Publication Editor  
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  Series Volume Series Issue Edition  
  ISSN ISBN 9810231857 Medium  
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  Notes DAG;IAM; Approved no  
  Call Number IAM @ iam @ LBM1997b Serial (down) 1563  
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Author Josep Llados; Horst Bunke; Enric Marti edit   pdf
url  doi
openurl 
  Title Finding rotational symmetries by cyclic string matching Type Journal Article
  Year 1997 Publication Pattern recognition letters Abbreviated Journal PRL  
  Volume 18 Issue 14 Pages 1435-1442  
  Keywords Rotational symmetry; Reflectional symmetry; String matching  
  Abstract Symmetry is an important shape feature. In this paper, a simple and fast method to detect perfect and distorted rotational symmetries of 2D objects is described. The boundary of a shape is polygonally approximated and represented as a string. Rotational symmetries are found by cyclic string matching between two identical copies of the shape string. The set of minimum cost edit sequences that transform the shape string to a cyclically shifted version of itself define the rotational symmetry and its order. Finally, a modification of the algorithm is proposed to detect reflectional symmetries. Some experimental results are presented to show the reliability of the proposed algorithm  
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  Publisher Elsevier Place of Publication Editor  
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  Area Expedition Conference  
  Notes DAG;IAM; Approved no  
  Call Number IAM @ iam @ LBM1997a Serial (down) 1562  
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Author Jaime Lopez-Krahe; Josep Llados; Enric Marti edit   pdf
url  openurl
  Title Architectural Floor Plan Analysis Type Report
  Year 2000 Publication CVonline Abbreviated Journal  
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  Address Edimburg, UK  
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  Publisher University of Edinburgh Place of Publication Editor Robert B. Fisher  
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  Series Volume Series Issue Edition  
  ISSN ISBN Medium online pdf  
  Area Expedition Conference  
  Notes DAG;IAM Approved no  
  Call Number IAM @ iam @ LLM2000 Serial (down) 1561  
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