[Forschungsseminar-BSV] [IZBI] Talk Bribiesca 8.8.14 Rittersaal (fwd)

[Ulf-Dietrich Braumann]

Hallo zusammen,

ich erlaube mir, nochmals auf den morgen Fr 8.8. um 11Uhr im Rittersaal 
(Raum 114, Härtelstraße 16-18) stattfindenden Vortrag "2D Tree Object 
Representation via the Slope Chain Code" von Ernesto Briebiesca und 
Guadalupe Bribiesca Contreras aufmerksam zu machen (Details siehe unten) 
und freue mich auf breites Interesse.

Grüße - UDBraumann


---------- Forwarded message ----------
From: Philine Melzow <melzow at izbi.uni-leipzig.de>
To: alle at izbi.uni-leipzig.de, all at bioinf.uni-leipzig.de
Date: Thu, 31 Jul 2014 10:30:12
Subject: [IZBI] Talk Bribiesca 8.8.14 Rittersaal

Dear all,

On behalf of Prof. Braumann I would like to announce a talk of Prof. 
Bribiesca and Guadalupe Bribiesca Contreras next Friday. They will be our 
guests for 4 weeks. Please see the attached announcement for more details.

Best
Philine


Vortrag
-------

Interdisziplinäres Zentrum für Bioinformatik (IZBI)

Freitag, 8. August 2014, 11.00 Uhr, Rittersaal 114, Härtelstraße 16-18,
04107 Leipzig


2D Tree Object Representation via the Slope Chain Code
------------------------------------------------------

Prof. Dr. Ernesto Bribiesca
(Computer Science Department, Applied Mathematics and Systems Research
Institute, National Autonomous University of Mexico, Mexico City)

M.Sc. Guadalupe Bribiesca Contreras
(Laboratory of Systematics and Ecology of Echinoderms, Institute of Marine
Sciences and Limnology, National Autonomous University of Mexico, Mexico
City)

Abstract
--------

A method for representing 2D (two-dimensional) tree objects is described.
This representation is based on a chain code, which is called the Slope
Chain Code (SCC). Thus, 2D tree objects are described by means of a chain of
element strings suitably combined by means of parentheses. These 2D tree
objects correspond to naturally existing 2D tree structures. This tree
notation preserves the shape of trees (and the shape of their branches),
allows us to know their topological and geometrical properties.
The proposed notation of 2D tree objects is invariant under translation,
rotation and, optionally, under scaling. Also, it is possible to define a
unique start vertex for each tree via the unique path in the tree. Using
this notation it is possible to obtain the mirror image of any tree with
ease. Furthermore, two interesting properties of trees are presented: the
accumulated slope and the tortuosity. Tortuosity is a very important
property of trees and has many applications indifferent fields. In order to
prove our method for representing 2D tree objects, we obtain some tree
descriptors of tree objects and compute their measures of accumulated slope
and tortuosity. Finally, we present some examples of 2D trees from the real
world about echinoderm species identification.

Prof. Dr.-Ing. Ulf-Dietrich Braumann, 97-16656, braumann at uni-leipzig.de