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Institut
- Fachbereich 4 (295) (entfernen)
3D-Kurven-Skelette werden oft verwendet, da sie im Vergleich zu der von Harry Blum 1967 vorgestellten Medialen Axen Transformation, eine Repäsentation der Objekt-Oberfläche darstellen, die in der Weiterverarbeitung weniger kompex und rechenintensiv ist.
Diese Arbeit hat das Ziel, ein Approximation-Verfahren für 3D-Kurven-Skelette zu entwickeln, welches die oben genannten Vorteile enthält und sich auf verschiedene Szenarien von Objektoberflächen-Daten anwenden lässt.
The term "Augmented Reality (AR)" denotes the superposition of additional virtual objects and supplementary information over real images. The joint project Enhanced Reality (ER)1 aims at a generic AR-system. The ER-project is a cooperation of six different research groups of the Department of Computer Science at the University of Koblenz-Landau. According to Ronald Azuma an AR-system combines real and virtual environments, where the real and virtual objects are registered in 3-D, and it provides interactivity in real time [Azu97]. Enhanced Reality extends Augmented Reality by requiring the virtual objects to be seamlessly embedded into the real world as photo-realistic objects according to the exact lighting conditions. Furthermore, additional information supplying value-added services may be displayed and interaction of the user may even be immersive. The short-term goal of the ER-project is the exploration of ER-fundamentals using some specific research scenarios; the long-term goal is the development of a component-based ER-framework for the creation of ER-applications for arbitrary application areas. ER-applications are developed as single-user applications for users who are moving in a real environment and are wearing some kind of visual output device like see-through glasses and some mobile end device. By these devices the user is able to see reality as it is, but he can also see the virtual objects and the additional information about some value-added service. Furthermore he might have additional devices whereby he can interact with the available virtual objects. The development of a generic framework for ER-applications requires the definition of generic components which are customizable and composable to build concrete applications and it requires a homogeneous data model which supports all components equally well. The workgroup "Software Technology"2 is responsible for this subproject. This report gives some preliminary results concerning the derivation of a component-based view of ER. There are several augmented reality frameworks like ARVIKA, AMIRE, DWARF, MORGAN, Studierstube and others which offer some support for the development of AR-applications. All of them ease the use of existing subsystems like AR-Toolkit, OpenGL and others and leverage the generation process for realistic systems by making efficient use of those subsystems. Consequently, they highly rely on them.
In der heutigen Robotik-Forschung soll hauptsächlich die Interaktion von autonomen, mobilen Robotern mit vorher nicht bekannten Umgebungen ermöglicht werden. Eines der grundlegendsten Probleme, das in diesem Kontext gelöst werden muss, ist die Frage, wo der Roboter ist und wie seine Umgebung in unmittelbarer Nähe, aber auch an bereits besuchten Orten aussieht " das sogenannte SLAM Problem.
In dieser Arbeit wird ein GraphSLAM System vorgestellt, das einen graphbasierten Lösungsansatz für dieses Problem darstellt. Ein solches System besteht aus einem Frontend und einem Backend. Das Frontend hat die Aufgabe, aus den Sensordaten einen Graphen zu konstruieren, der die relative Lage der Messungen zueinander widerspiegelt. Da sich Messungen widersprechen können, ist ein solcher Graph im Allgemeinen inkonsistent. Das Backend hat nun die Aufgabe, diesen Graphen zu optimieren, d. h. eine Konfiguration der Knoten zu bestimmen, die sich nur minimal widerspricht. Knoten repräsentieren Roboterposen, die aufgrund der enthaltenen Rotationen sog. Mannigfaltigkeiten sind und keinen gewöhnlichen Vektorraum bilden. Dies wird in der Arbeit konsequent berücksichtigt, was zu einem sehr effizienten und eleganten Optimierungsverfahren führt.
The lack of a formal event model hinders interoperability in distributed event-based systems. Consequently, we present in this paper a formal model of events, called F. The model bases on an upper-level ontology and pro-vides comprehensive support for all aspects of events such as time and space, objects and persons involved, as well as the structural aspects, namely mereological, causal, and correlational relationships. The event model provides a flexible means for event composition, modeling of event causality and correlation, and allows for representing different interpretations of the same event. The foundational event model F is developed in a pattern-oriented approach, modularized in different ontologies, and can be easily extended by domain specifific ontologies.
This paper describes a parallel algorithm for selecting activation functionsrnof an artifcial network. For checking the efficiency of this algorithm a count of multiplicative and additive operations is used.
In this article we analyze the privacy aspects of a mobile sensor application used for recording urban travel patterns as part of a travel-survey service. This service has been developed and field-tested within the Live+Gov EU Project. The privacy analysis follows a structured approach established in. Eight privacy recommendations are derived, and have already led to corresponding enhancements of the travel-survey service.
Conventional security infrastructures in the Internet cannot be directly adopted to ambient systems, especially if based on short-range communication channels: Personal, mobile devices are used and the participants are present during communication, so privacy protection is a crucial issue. As ambient systems cannot rely on an uninterrupted connection to a Trust Center, certiffed data has to be veriffed locally. Security techniques have to be adjusted to the special environment. This paper introduces a public key infrastructure (PKI) to provide secure communication channels with respect to privacy, confidentiality, data integrity, non-repudiability, and user or device authentication. It supports three certiffcate levels with a different balance between authenticity and anonymity. This PKI is currently under implementation as part of the iCity project.
Dieses Dokument legt den Standard für die Transformation von grUML-Schemas (GraphUML, [BHR+09]) nach XSD (XML Schema Definition) fest und ist im Rahmen des Arbeitspakets 5.2 "Prototypische SOAMIG-Parser und -Unparser realisieren" im SOAMIG-Projekt entstanden. Das Ziel ist der Austausch von TGraphen (typisierten, attributierten, angeordneten, gerichte Graphen [ERW08]) über XML-Dokumente. Zur Spezifikation des Austauschformats wird XSD eingesetzt. Dies erlaubt eine Validierung der XML-Instanzen auf syntaktischer Ebene. Der Ausgangspunkt ist ein gegebenes Schemas in grUML-Notation1, welches nach XSD transformiert werden soll. Mit der generierten XSD existiert ein Beschreibungsmittel für Graph-Instanzen in XML. Die dadurch beschriebenen XML-Dokumente sind flach, d.h. alle Elemente sind direkt dem root-Element untergeordnet.