DGCI 2013 Demo Session 7th IAPR International Conference on Discrete Geometry for Computer Imagery. Foreword

Imagen-A Servicio de Publicaciones de la Universidad de Sevilla Volume 3, Number 4 Daniel D´ıaz-Pernil, Irene Fond´on, Roc´ıo Gonz´alez D´ıaz and Mar´ıa Jos´e Jim´enez (guest eds.) Imagen-A DGCI 2013 Demo Session 7th IAPR International Conference on Discrete Geometry for Computer Imagery Daniel D´ıaz-Pernil, Irene Fond´on, Roc´ıo Gonz´alez-D´ıaz and Mar´ıa Jos´e Jim´enez (eds.) Servicio de Publicaciones de la Universidad de Sevilla University of Seville Seville 2013 Spain ISSN: 1885-4508 Preface This collection documents the contributions presented at the DGCI2013 demonstration session. The purpose of this session is to provide the opportunity to present and share effective applications related to the main topics of DGCI. Authors of DGCI2013 accepted papers were highly encouraged to participate showing their software to effectively reproduce their results. However, demonstrations were not limited to papers accepted to be presented at DGCI2013 conference and can also be done from works that were presented on past conferences or others venues. Moreover new development tools/libraries that are planned to be used in future research were also presented in this demonstration session. The only selection criteria relied on the fact that the subject of the demonstration wwere relevant to topics of Discrete Geometry: •Models for Discrete Geometry (grids, discrete objects, discrete model properties, digitization schemes, metrics,...) •Discrete and Combinatorial Topology •Geometric Transforms (image mappings, distance transformation, skeletons and medial axis,...) •Discrete Shape Representation, Recognition and Analysis •Discrete Tomography •Morphological Analysis •Discrete Modelling and Visualization •Discrete and Combinatorial Tools for Image Segmentation and Analysis DGCI 2013 has been supported by the International Association of Pattern Recognition (IAPR) and is the main event associated with the Technical Committee on Discrete Geometry IAPR-TC18. This conference could not have been organized without our sponsoring institutions: University of Seville (Vice-rectorate for Research, Vice-rectorate of Internationalization, the Mathematics Institute (IMUS), the Research and Teaching Foundation FIDETIA, Applied Math-I Department), Spanish Ministry of Economy and Competitiveness (Project MTM2012-32706) and European Science Foundation (ACAT program). We are also grateful to the School of Computer Engineering at the University of Seville, for hosting this event and providing all the necessary facilities. Daniel D´ıaz-Pernil Irene Fond´on Rocio Gonz´alez-D´ıaz Maria-Jose Jim´enez Seville, March 2013 Guest Editors Daniel D´ıaz-Pernil Irene Fond´on Roc´ıo Gonz´alez-D´ıaz Mar´ıa Jos´e Jim´enez Program Committee Ainhoa Berciano Alcaraz Univ. del Pa´ıs Vasco Daniel D´ıaz-Pernil Univ. de Sevilla Massimo Ferri Univ. di Bologna Patrizio Frosini Univ. di Bologna Roc´ıo Gonz´alez D´ıaz Univ. de Sevilla Miguel Angel Guti´errez-Naranjo Univ. de Sevilla Mar´ıa Jos´e Jim´enez Univ. de Sevilla Claudia Landi Univ. di Modena e Reggio Emilia Pascal Lienhardt Univ. de Poitiers Marta Macho Stadler Univ. del Pa´ıs Vasco Jean-Luc Mari Univ. de la Mediterrane, Marsella Bel´en Medrano Univ. de Sevilla Helena Molina-Abril Univ. de Sevilla Aniceto Murillo Univ. de Malaga Darian Onchis Univ. Wien Ana Pacheco Univ. de Sevilla Pedro Real Univ. de Sevilla Julio Rubio Garcia Univ. de La Rioja Jean Sequeiras Univ. de la Mediterrane, Marsella Francis Sergeraert Univ. de Grenoble I Table of Contents Calibration in optical graph recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 C. Auer, C. Bachmaier, F.J: Brandenburg, A. Gleißner, A. Reislhuber TKDetection: a software to detect and segment wood knots . . . . . . . . . . . . . . . . . 15 Adrien Kr¨ahenb¨uhl, Bertrand Kerautret, Isabelle Debled-Rennesson Reconstructing persistent graph structures from noisy images . . . . . . . . . . . . . . . . 19 Alexey Chernov, Vitaliy Kurlin Regularmapsmoothing ....................................... 23 Faniry Razafindrazaka, Konrad Polthier Implementation of Integral based Digital Curvature Estimators in DGtal . . . . . . . . . 27 David Coeurjolly, Jacques-Olivier Lachaud, J´er´emy Levallois Distributed boundary tracking using alpha and Delaunay-Cech shapes . . . . . . . . . . . 33 Harish Chintakunta, Hamid Krim Interactive display of 2D and 3D discrete quadrics with controlled topology . . . . . . . . 37 Eric Andres, Jean-Luc Toutant Bioinspired parallel 2D or 3D skeletonization . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Ra´ul Re´ına-Molina, Daniel D´ıaz-Pernil Software tool for contrast enhancement and segmentation of melanoma images based on humanperception ......................................... 45 Irene Fond´on, Qaisar Abbas, M. Emre Celebi, Waqar Ahmadand QaisarMushtaq An application for gait recognition using persistent homology . . . . . . . . . . . . . . . . 49 Javier Lamar Le´on,Edel Garc´ıa Reyes, Roc´ıo Gonz´alez D´ıaz, Raul Alonso Baryolo i