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Author |
Maria Vanrell; Jordi Vitria |
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Title |
Optimal 3x3 decomposable disks for morphological transformations |
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Year |
1997 |
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Image and Vision Computing |
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15 |
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11 |
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845-854 |
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OR;CIC;MV |
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BCNPCL @ bcnpcl @ VaV1997c |
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543 |
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Author |
Josep Llados; Horst Bunke; Enric Marti |
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Title |
Finding rotational symmetries by cyclic string matching |
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Journal Article |
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Year |
1997 |
Publication |
Pattern recognition letters |
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PRL |
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18 |
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14 |
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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;Horst Bunke; Enric Marti |
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Title |
Using Cyclic String Matching to Find Rotational and Reflectional Symmetries in Shapes |
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Conference Article |
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Year |
1997 |
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Intelligent Robots: Sensing, Modeling and Planning |
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164-179 |
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Dagstuhl Workshop |
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World Scientific Press |
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9810231857 |
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DAG;IAM; |
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IAM @ iam @ LBM1997b |
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1563 |
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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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Book Chapter |
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Year |
1997 |
Publication |
Machine Vision and Applications |
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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 |
Josep Llados; Enric Marti |
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Title |
Playing with error-tolerant subgraph isomorphism in line drawings |
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Conference Article |
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1997 |
Publication |
VII National Symposium on Pattern Recognition and image Analysis |
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DAG;IAM; |
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no |
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IAM @ iam @ LlM1997 |
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1570 |
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Author |
Ernest Valveny; Enric Marti |
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Title |
Dimensions analysis in hand-drawn architectural drawings |
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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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90-91 |
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DAG;IAM; |
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Call Number |
IAM @ iam @ VAM1997 |
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1659 |
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Author |
A. Martinez; Jordi Vitria |
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Title |
From Visual Scanning to Object Recognition |
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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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Barcelona |
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OR;MV |
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BCNPCL @ bcnpcl @ MaV1997c |
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58 |
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Author |
X. Binefa; Xavier Roca; Jordi Vitria |
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Title |
A Contrast Approach to Depth from Focus. |
Type |
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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Barcelona |
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OR;ISE;MV |
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BCNPCL @ bcnpcl @ BRV1997 |
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63 |
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Author |
David Lloret; Antonio Lopez; Joan Serrat |
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Title |
Rigid Registration of CT and MR volumes based on Rothes creases |
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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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1-6 |
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Barcelona (Spain) |
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ADAS |
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ADAS @ adas @ LLS1997 |
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490 |
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Author |
Antonio Lopez |
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Title |
Ridge/Valley-like structures: Creases, separatrices and drainage patterns |
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Miscellaneous |
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1997 |
Publication |
Computer vision on–line |
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CVC |
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ADAS |
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ADAS @ adas @ Lop1997 |
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488 |
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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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Author |
Maria Vanrell |
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Title |
Exploring the space of behaviour of a texture perception algorithm |
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Report |
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1997 |
Publication |
CVC Technical Report #12 |
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CIC |
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CAT @ cat @ Van1997 |
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523 |
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Author |
Antonio Lopez; Joan Serrat |
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Title |
Ridge/Valley-like structures: Creases, separatrices and drainage patterns |
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Report |
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1997 |
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CVC Technical Report #21 |
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ADAS |
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ADAS @ adas @ LoS1997 |
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524 |
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Author |
A. Martinez; J.R. Serra; Jordi Vitria; J.B. Subirana |
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Title |
An Iconic Representation for Image Retrieval |
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1997 |
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CVC Technical Report #19 |
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OR;MV |
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BCNPCL @ bcnpcl @ MSV1997 |
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531 |
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Author |
A. Martinez; Jordi Vitria |
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A first step towards a low-dimensional face representation space |
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1997 |
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CVC Technical Report #20 |
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OR;MV |
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BCNPCL @ bcnpcl @ MaV1997b |
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532 |
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