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| Author | Josep Llados; Horst Bunke; Enric Marti | ||||
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Using cyclic string matching to find rotational and reflectional symmetric shapes | Type | Conference Article | ||
| Year | 1996 | Publication | Dagstuhl Seminar on Modelling and Planning for Sensor–based Intelligent Robot Systems | Abbreviated Journal | |
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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 | 1564 | ||
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| Author | Josep Llados; Horst Bunke; Enric Marti | ||||
| 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 | |
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| 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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| Notes | DAG;IAM; | Approved | no | ||
| Call Number | IAM @ iam @ LIM1995 | Serial | 1565 | ||
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| Author | Josep Llados; Horst Bunke; Enric Marti | ||||
| 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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| Notes | DAG;IAM; | Approved | no | ||
| Call Number | IAM @ iam @ LBM1997a | Serial | 1562 | ||
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