[Forschungsseminar-BSV] [IZBI] F-Seminar Sonderveranstaltung am 22.08.2012

[Corinna Dittmann]

E I N L A D U N G

 

 

zum F-Seminar des Interdisziplinären Zentrums für Bioinformatik (IZBI)/ des
Instituts für Medizinische Informatik, Statistik und Epidemiologie (IMISE)
am Mittwoch, den 22.08.2012, 14:30 Uhr, im Raum 109 in der Härtelstraße
16-18.

 

 

Wir hören Vorträge von

 

Dr. Hermilo Sánchez-Cruz (Centro de Ciencias Basicas, Universidad Autónoma
de Aguascalientes, México)

mit dem Titel

 

"A Proposal for a Chain Code to represent 3D Skeletons"

 

Abstract:

A chain code to represent 3D skeletons is proposed. The method is based on
the concept of equivalent voxel arrays, each of them associated to three
main vectors: a reference vector, a support vector, and a change direction
vector. A set of rotation transformations is defined in the 3D Euclidean
space, and an alphabet of only 25 symbols was found to represent any face,
edge or vertex-connected discrete curve. 

Also, we used the code to represent skeletons using parenthesis and a
lexicographical order to traverse each of the branches. The proposal code is
independent to translation, rotation and mirror transformations. 

Finally, a set of 3D skeleton objects were utilized to prove the proposed
code.

 

Und

 

Prof. Dr. Ernesto Bribiesca (Instituto de Investigaciones en Matemáticas
Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, Ciudad de
México, México)

Mit dem Titel

 

“A Measure of Tortuosity based on Chain Coding”

 

Abstract: 

A measure of tortuosity for 2D curves is presented. Tortuosity is a very
important property of curves and has many applications, such as: 

how to measure the tortuosity of retinal blood vessels, intra-cerebral
vasculature, aluminium foams, etc. The measure of tortuosity proposed here
is based on a chain code called Slope Chain Code (SCC). The SCC of a curve
is obtained by placing straight-line segments of constant length around the
curve (the endpoints of the straight-line segments always touching the
curve, so a better description of the curve is obtained), and calculating
the slope changes between contiguous straight-line segments scaled to a
continuous range from -1 to 1. The SCC of a curve is independent of
translation, rotation, and optionally, of scaling, which is an important
advantage for computing tortuosity. Also, the minimum and maximum values of
tortuosity for curves and a measure of normalized tortuosity are described.
Finally, an application of the proposed measure of tortuosity is presented
which corresponds to the computation of retinal blood vessel tortuosity.

 

 

Mit freundlichen Grüßen

Corinna Dittmann

 

Sekretariat - PD Dr. Hans Binder

Sekretariat - Interdisziplinäres Zentrum für Bioinformatik (IZBI)

Projektkoordination LIFE - Leipziger Forschungszentrum für
Zivilisationserkrankungen

Universität Leipzig

Härtelstr. 16-18, Raum 327

04107 Leipzig

 

Tel.: 0341 97-16670

Fax: 0341 97-16669

 

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