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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
Address
Corporate Author
Thesis
Publisher
Elsevier
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
DAG;IAM;
Approved
no
Call Number
IAM @ iam @ LBM1997a
Serial
1562
Permanent link to this record
Author
Ole Larsen; Petia Radeva; Enric Marti
Title
Bounds on the optimal elasticity parameters for a snake
Type
Journal Article
Year
1995
Publication
Image Analysis and Processing
Abbreviated Journal
Volume
Issue
Pages
37-42
Keywords
Abstract
This paper develops a formalism by which an estimate for the upper and lower bounds for the elasticity parameters for a snake can be obtained. Objects different in size and shape give rise to different bounds. The bounds can be obtained based on an analysis of the shape of the object of interest. Experiments on synthetic images show a good correlation between the estimated behaviour of the snake and the one actually observed. Experiments on real X-ray images show that the parameters for optimal segmentation lie within the estimated bounds.
Address
Corporate Author
Thesis
Publisher
Place of Publication
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
ISBN
Medium
Area
Expedition
Conference
Notes
MILAB;IAM
Approved
no
Call Number
IAM @ iam @ LRM1995a
Serial
1559
Permanent link to this record
Author
Enric Marti; Jordi Regincos;Jaime Lopez-Krahe; Juan J.Villanueva
Title
Hand line drawing interpretation as three-dimensional objects
Type
Journal Article
Year
1993
Publication
Signal Processing – Intelligent systems for signal and image understanding
Abbreviated Journal
Volume
32
Issue
1-2
Pages
91-110
Keywords
Line drawing interpretation; line labelling; scene analysis; man-machine interaction; CAD input; line extraction
Abstract
In this paper we present a technique to interpret hand line drawings as objects in a three-dimensional space. The object domain considered is based on planar surfaces with straight edges, concretely, on ansextension of Origami world to hidden lines. The line drawing represents the object under orthographic projection and it is sensed using a scanner. Our method is structured in two modules: feature extraction and feature interpretation. In the first one, image processing techniques are applied under certain tolerance margins to detect lines and junctions on the hand line drawing. Feature interpretation module is founded on line labelling techniques using a labelled junction dictionary. A labelling algorithm is here proposed. It uses relaxation techniques to reduce the number of incompatible labels with the junction dictionary so that the convergence of solutions can be accelerated. We formulate some labelling hypotheses tending to eliminate elements in two sets of labelled interpretations. That is, those which are compatible with the dictionary but do not correspond to three-dimensional objects and those which represent objects not very probable to be specified by means of a line drawing. New entities arise on the line drawing as a result of the extension of Origami world. These are defined to enunciate the assumptions of our method as well as to clarify the algorithms proposed. This technique is framed in a project aimed to implement a system to create 3D objects to improve man-machine interaction in CAD systems.
Address
Corporate Author
Thesis
Publisher
Elsevier North-Holland, Inc.
Place of Publication
Amsterdam, The Netherlands, The Netherlands
Editor
Language
Summary Language
Original Title
Series Editor
Series Title
Abbreviated Series Title
Series Volume
Series Issue
Edition
ISSN
0165-1684
ISBN
Medium
Area
Expedition
Conference
Notes
IAM;ISE;
Approved
no
Call Number
IAM @ iam @ MRL1993
Serial
1611
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