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Author |
Gemma Sanchez; Josep Llados; Enric Marti |
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Title |
Segmentation and analysis of linial texture in plans |
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1997 |
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Actes de la conférence Artificielle et Complexité. |
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Structural Texture, Voronoi, Hierarchical Clustering, String Matching. |
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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. |
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Paris, France |
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Paris |
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AERFAI |
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DAG;IAM; |
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IAM @ iam @ SLM1997 |
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1649 |
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Author |
Josep Llados; Horst Bunke; Enric Marti |
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Title |
Finding rotational symmetries by cyclic string matching |
Type |
Journal Article |
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Year |
1997 |
Publication |
Pattern recognition letters |
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PRL |
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Volume |
18 |
Issue |
14 |
Pages |
1435-1442 |
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Rotational symmetry; Reflectional symmetry; String matching |
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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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Elsevier |
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DAG;IAM; |
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IAM @ iam @ LBM1997a |
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1562 |
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Author |
Josep Llados; Jaime Lopez-Krahe; Enric Marti |
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Title |
A system to understand hand-drawn floor plans using subgraph isomorphism and Hough transform |
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Year |
1997 |
Publication |
Machine Vision and Applications |
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Volume |
10 |
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3 |
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150-158 |
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Line drawings – Hough transform – Graph matching – CAD systems – Graphics recognition |
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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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DAG;IAM |
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IAM @ iam @ LLM1997a |
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1566 |
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Author |
A. Pujol; Javier Varona; Joan Serrat |
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Title |
A machine vision system for the inspection of industrial sieves. |
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Year |
1997 |
Publication |
(SNRFAI’97) 7th Spanish National Symposium on Pattern Recognition and Image Analysis |
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ADAS |
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ADAS @ adas @ PVS1997 |
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33 |
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Author |
Maria Vanrell; Jordi Vitria; Xavier Roca |
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Title |
A multidimensional scaling approach to explore the behavior of a texture perception algorithm. |
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1997 |
Publication |
Machine Vision and Applications |
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9 |
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262–271 |
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OR;ISE;CIC;MV |
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no |
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Call Number |
BCNPCL @ bcnpcl @ VVR1997 |
Serial |
35 |
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Author |
Xavier Roca; X. Binefa; Jordi Vitria |
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Title |
A New Accomodation Algorithm for a Microscopy Environment. |
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Conference Article |
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Year |
1997 |
Publication |
(SNRFAI’97) 7th Spanish National Symposium on Pattern Recognition and Image Analysis |
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66-67 |
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OR;ISE;MV |
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BCNPCL @ bcnpcl @ RBV1997 |
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37 |
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Author |
Josep Llados; Gemma Sanchez; Enric Marti |
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Title |
A String-Based Method to Recognize Symbols and Structural Textures in Architectural Plans. |
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Conference Article |
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1997 |
Publication |
Graphics Recognition Algorithms and Systems. GREC 1997. |
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1389 |
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91-103 |
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DAG |
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DAG @ dag @ LSM1997 |
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44 |
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Author |
A. Martinez; S. Gonzalez; Jordi Vitria; J. Lopez |
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Title |
NAT: a robot that recognizes offices. |
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Conference Article |
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Year |
1997 |
Publication |
Proceedings of CAEPIA–97. VII Conferencia de la Asociación Española para la Inteligencia Artificial. |
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327-336 |
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CAEPIA |
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OR;MV |
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BCNPCL @ bcnpcl @ MGV1997 |
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46 |
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Author |
Antonio Lopez; Felipe Lumbreras; A. Martinez; Joan Serrat; Xavier Roca; Javier Varona; Jordi Vitria |
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Title |
Aplicaciones de la vision por computador a la industria. |
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Miscellaneous |
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1997 |
Publication |
CVC |
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ADAS;OR;ISE;MV |
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ADAS @ adas @ LLM1997b |
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50 |
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A. Martinez; Jordi Vitria |
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Title |
Using Low-Dimensional Spaces for Face Recognition. |
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1997 |
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Jornades d'Intel.ligència Artificial: Noves Tendències (JIA'97) |
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DOC;OR;MV |
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BCNPCL @ bcnpcl @ MaV1997a |
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52 |
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Author |
J.R. Serra; A. Martinez; Jordi Vitria; J.B. Subirana |
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Title |
Iconic Representation to Image Retrieval. |
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1997 |
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Jornades d'Intel.ligència Artificial: Noves Tendències (JIA'97) |
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DOC;OR;MV |
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BCNPCL @ bcnpcl @ SMV1997 |
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55 |
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Author |
A. Sanfeliu; Juan J. Villanueva; Jordi Vitria |
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Title |
Image Analysis and Pattern Recognition. |
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1997 |
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Image Analysis and Pattern Recognition. |
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BCNPCL @ bcnpcl @ SVV1997 |
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56 |
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Author |
A. Martinez; Jordi Vitria |
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Title |
From Visual Scanning to Object Recognition |
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1997 |
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(SNRFAI’97) 7th Spanish National Symposium on Pattern Recognition and Image Analysis. |
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Barcelona |
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OR;MV |
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BCNPCL @ bcnpcl @ MaV1997c |
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58 |
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Author |
A. Martinez; Jordi Vitria; J. Lopez |
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Title |
Visual Recognition of Surroundings: A robot that knows where it is. |
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1997 |
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Actes de la conférence Artificielle et Complexite. |
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Paris. |
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BCNPCL @ bcnpcl @ MVL1997 |
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59 |
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Author |
Javier Varona; Juan J. Villanueva |
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Title |
Neural Networks for Early Vision. |
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1997 |
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(SNRFAI’97) 7th Spanish National Symposium on Pattern Recognition and Image Analysis |
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ISE @ ise @ VaV1997b |
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62 |
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