Liste der Fachpublikationen

Show publication details
Kloß, Enrico; Schröder, Andreas

3D-Registrierung zum Soll-Ist-Vergleich auf Basis unterschiedlicher Geometriedateiformate

2014

Paul, Lothar (Ed.) et al.: 3D-NordOst 2014 : 17. Anwendungsbezogener Workshop zur Erfassung, Modellierung, Verarbeitung und Auswertung von 3D-Daten. Berlin: GFaI, 2014, pp. 43-52

Anwendungsbezogener Workshop zur Erfassung, Modellierung, Verarbeitung und Auswertung von 3D-Daten (3D-NordOst) <17, 2014, Berlin, Germany>

Der Soll-Ist-Vergleich ist eine notwendige Maßnahme zur Sicherung der Qualität gefertigter Bauteile. Zur Automatisierung des Soll-Ist-Vergleiches sind eine einheitliche Repräsentation der Geometrie und eine robuste 3D-Registrierung notwendig. In diesem Beitrag wird eine Methode zur 3D-Registrierung auf Basis verschiedener Geometriedateiformate großer technischer Objekte vorgestellt. Ausgehend von einem Laserscan (Ist-Modell) und einem CAD-Format (Soll-Modell) wird eine einheitliche Dreiecksrepräsentation generiert. Anhand der einheitlichen Repräsentation, dem weitverbreiteten STL-Format, wird eine dreistufige 3D-Registrierung vorgenommen. In der ersten Stufe werden aus den Dreiecken geeignete Punkte generiert. In der zweiten Stufe werden die Punktwolken anhand von lokalen Merkmalen grob vorregistriert und in der letzten und dritten Stufe diese genau aufeinander registriert. Durch die Anbindung der Funktionalität an eine CAD/CAM Software, wie bspw. DCAM, ergeben sich eine einfach handhabbare 3D-Registrierung und eine Basis für einen anschließenden Soll-Ist-Vergleich.

Show publication details
Flach, Guntram; Frenzel, Chathy

9. Rostocker eGovernment-Forum 2014 - Sicheres eGovernment: Herausforderung und Notwendigkeit

2014

Rostocker eGovernment-Forum <9, 2014, Rostock-Warnemünde, Germany>

Das 9. Rostocker eGovernment-Forum verfolgt das Ziel, anhand von Fachvorträgen und Praxisbeispielen neuartige Konzepte und Lösungen aus den Themenbereichen IT-Sicherheit, Open Government, mobile Anwendungen, Cloud Computing und Optimierung von Verwaltungsprozessen vorzustellen und Gelegenheit zu einem Gedanken- und Erfahrungsaustausch zu schaffen. Der vorliegende Tagungsband dokumentiert mit seinen Kurzfassungen ein anspruchsvolles Vortragsprogramm.

Show publication details
Wesarg, Stefan; Jung, Florian; Steger, Sebastian

Abbildung anatomischen Wissens: Ein Kopf-/Hals-Atlas multipler gekoppelter Strukturen

2014

Endoskopie heute, Vol.27 (2014), 3, pp. 141-145

Medizinische Bilddaten enthalten anatomische Informationen. Die Extraktion derselben durch manuelles Markieren ist unter Berücksichtigung der Datenmenge vor allem bei radiologischen 3D-Bilddaten nicht mehr vernünftig durchführbar. Hier helfen computerbasierte, automatische Verfahren. Nicht alle anatomischen Regionen heben sich durch deutliche Kontrastunterschiede von der Umgebung ab. Dennoch sind Radiologen in der Lage, auch solche Bereiche in den Bilddaten zuzuordnen. Für automatisch ablaufende Algorithmen besteht dabei die Herausforderung, das anatomische Wissen eines klinischen Experten in einer für den Computer verständlichen Form zu repräsentieren. Für den Kopf-/Hals-Bereich haben wir ein solches Modell entwickelt, das anatomische Strukturen enthält, die miteinander gekoppelt sind. Das Modell repräsentiert diese hinsichtlich ihrer Form und Größe als auch ihrer relativen Lage zueinander. Dabei wird zwischen aktiven und passiven Strukturen unterschieden. Erstere repräsentieren deutlich von der Umgebung abgrenzbare Bildbereiche, letztere Regionen, die nur aufgrund ihrer relativen Lage zu anderen Organen identifizierbar sind. Der neue Modellierungsansatz ist dabei einerseits flexibler als klassische atlasbasierte Segmentierungsverfahren. Andererseits sind das neue Verfahren und das dafür entwickelte Framework generisch und können mit geringen Adaptionen auch für Fragestellungen jenseits des Kopf-/Hals-Bereichs eingesetzt werden.

Show publication details

Abschlussbericht - MEMO Basis, Design und Shared Services

2014

Zielstellung und Schwerpunkt des Teilprojektes "MEMO Basis, Design und Shared Services" war die Entwicklung von Konzepten und die prototypische Umsetzung von Shared Services. Diese realisieren Basisdienste für höher aggregierte MEMO-Dienste Zu den Shared Services zählen Semantik-Dienste, Empfehlungsdienste, Aggregationsdienste und Profiling-Dienste. Aufbauend auf diesen Shared Services erstellte das IGD intelligente Supportdienste für die Kommunikation mit Experten, Dienste für die semantische Suche und proaktive Bereitstellung von Informationen sowie Game-Dienste zur Vermittlung von Handlungswissen. Das Fraunhofer IGD leistete im Teilprojekt außerdem Beiträge zur Entwicklung und Umsetzung der konzeptionellen Architektur des MEMO Referenz Portals, in welchem die verschiedenen Einzeldienste nach dem Cloud-Prinzip für unterschiedliche Anwendungen verfügbar gemacht wurden. Das Fraunhofer IGD war außerdem für die Koordination der Entwicklung der Use Case Beschreibungen für das Gesamtsystem und die einzelnen zu entwickelnden Dienste verantwortlich.

Show publication details
Nazemi, Kawa; Fellner, Dieter W. (Betreuer); Wrobel, Stefan (Betreuer)

Adaptive Semantics Visualization

2014

Darmstadt, TU, Diss., 2014

Human access to the increasing amount of information and data plays an essential role for the professional level and also for everyday life. While information visualization has developed new and remarkable ways for visualizing data and enabling the exploration process, adaptive systems focus on users' behavior to tailor information for supporting the information acquisition process. Recent research on adaptive visualization shows promising ways of synthesizing these two complementary approaches and make use of the surpluses of both disciplines. The emerged methods and systems aim to increase the performance, acceptance, and user experience of graphical data representations for a broad range of users. Although the evaluation results of the recently proposed systems are promising, some important aspects of information visualization are not considered in the adaptation process. The visual adaptation is commonly limited to change either visual parameters or replace visualizations entirely. Further, no existing approach adapts the visualization based on data and user characteristics. Other limitations of existing approaches include the fact that the visualizations require training by experts in the field. In this thesis, we introduce a novel model for adaptive visualization. In contrast to existing approaches, we have focused our investigation on the potentials of information visualization for adaptation. Our reference model for visual adaptation not only considers the entire transformation, from data to visual representation, but also enhances it to meet the requirements for visual adaptation. Our model adapts different visual layers that were identified based on various models and studies on human visual perception and information processing. In its adaptation process, our conceptual model considers the impact of both data and user on visualization adaptation. We investigate different approaches and models and their effects on system adaptation to gather implicit information about users and their behavior. These are than transformed and applied to affect the visual representation and model human interaction behavior with visualizations and data to achieve a more appropriate visual adaptation. Our enhanced user model further makes use of the semantic hierarchy to enable a domain-independent adaptation. To face the problem of a system that requires to be trained by experts, we introduce the canonical user model that models the average usage behavior with the visualization environment. Our approach learns from the behavior of the average user to adapt the different visual layers and transformation steps. This approach is further enhanced with similarity and deviation analysis for individual users to determine similar behavior on an individual level and identify differing behavior from the canonical model. Users with similar behavior get similar visualization and data recommendations, while behavioral anomalies lead to a lower level of adaptation. Our model includes a set of various visual layouts that can be used to compose a multi-visualization interface, a sort of "'visualization cockpit"'. This model facilitates various visual layouts to provide different perspectives and enhance the ability to solve difficult and exploratory search challenges. Data from different data-sources can be visualized and compared in a visual manner. These different visual perspectives on data can be chosen by users or can be automatically selected by the system. This thesis further introduces the implementation of our model that includes additional approaches for an efficient adaptation of visualizations as proof of feasibility. We further conduct a comprehensive user study that aims to prove the benefits of our model and underscore limitations for future work. The user study with overall 53 participants focuses with its four conditions on our enhanced reference model to evaluate the adaptation effects of the different visual layers.

Show publication details

Adaptive Visualization of Linked-Data

2014

Bebis, George (Ed.) et al.: Advances in Visual Computing. 10th International Symposium, ISVC 2014 : Proceedings, Part II. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8888), pp. 872-883

International Symposium on Visual Computing (ISVC) <10, 2014, Las Vegas, NV, USA>

Adaptive visualizations reduces the required cognitive effort to comprehend interactive visual pictures and amplify cognition. Although the research on adaptive visualizations grew in the last years, the existing approaches do not consider the transformation pipeline from data to visual representation for a more efficient and effective adaptation. Further todays systems commonly require an initial training by experts from the field and are limited to adaptation based either on user behavior or on data characteristics. A combination of both is not proposed to our knowledge. This paper introduces an enhanced instantiation of our previously proposed model that combines both: involving different influencing factors for and adapting various levels of visual peculiarities, on content, visual layout, visual presentation, and visual interface. Based on data type and users' behavior, our system adapts a set of applicable visualization types. Moreover, retinal variables of each visualization type are adapted to meet individual or canonical requirements on both, data types and users' behavior. Our system does not require an initial expert modeling.

Show publication details

Adaptive Visualization of Social Media Data for Policy Modeling

2014

Bebis, George (Ed.) et al.: Advances in Visual Computing. 10th International Symposium, ISVC 2014 : Proceedings, Part I. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8887), pp. 333-344

International Symposium on Visual Computing (ISVC) <10, 2014, Las Vegas, NV, USA>

The visual analysis of social media data emerged a huge number of interactive visual representations that use different characteristics of the data to enable the process of information acquisition. The social data are used in the domain of policy modeling to gather information about citizens' demands, opinions, and requirements and help to decide about political policies. Although existing systems already provide a huge number of visual analysis tools, the search and exploration paradigm is not really clear. Furthermore, the systems commonly do not provide any kind of human centered adaptation for the different stakeholders involved in the policy making process. In this paper, we introduce a novel approach that investigates the exploration and search paradigm from two different perspectives and enables a visual adaptation to support the exploration and analysis process.

Show publication details
Große-Puppendahl, Tobias; Beck, Sebastian; Wilbers, Daniel; Zeiß, Steeven; Wilmsdorff, Julian von; Kuijper, Arjan

Ambient Gesture-Recognizing Surfaces with Visual Feedback

2014

Streitz, Norbert (Ed.) et al.: Distributed, Ambient, and Pervasive Interactions : DAPI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8530), pp. 97-108

International Conference on Distributed, Ambient and Pervasive Interactions (DAPI) <2, 2014, Heraklion, Crete, Greece>

In recent years, gesture-based interaction gained increasing interest in Ambient Intelligence. Especially the success of camera-based gesture recognition systems shows that a great variety of applications can benefit significantly from natural and intuitive interaction paradigms. Besides camera-based systems, proximity-sensing surfaces are especially suitable as an input modality for intelligent environments. They can be installed ubiquitously under any kind of non-conductive surface, such as a table. However, interaction barriers and the types of supported gestures are often not apparent to the user. In order to solve this problem, we investigate an approach which combines a semi-transparent capacitive proximity-sensing surface with an LED array. The LED array is used to indicate possible gestural movements and provide visual feedback on the current interaction status. A user study shows that our approach can enhance the user experience, especially for inexperienced users.

Show publication details

Anatomical Discovery: Finding Organs in the Neighborhood of the Liver

2014

Romero, Laura M. Roa (Ed.): XIII Mediterranean Conference on Medical and Biological Engineering and Computing : MEDICON 2013. Berlin, Heidelberg, New York: Springer, 2014. (IFMBE Proceedings 41), pp. 348-351

The Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON) <13, 2013, Seville, Spain>

Image segmentation and registration algorithms are fundamental to assist medical doctors for better treatment of the patients. To this end accuracy in the results given by those algorithms is crucial. The surroundings of the organ to be segmented or registered can provide additional information that at the end improves the result. In this paper a novel algorithm to detect the organs that surround the liver is introduced. Even though our work is focused on the liver, the algorithm could be extended to other parts of the body. The algorithm has been tested in 24 clinical CT datasets. In addition to this, an example application is introduced for which the detection is a useful tool.

Show publication details
Braun, Andreas; Fellner, Dieter W. (Betreuer); Mühlhäuser, Max (Betreuer)

Application and Validation of Capacitive Proximity Sensing Systems in Smart Environments

2014

Darmstadt, TU, Diss., 2014

Smart environments feature a number of computing and sensing devices that support occupants in performing their tasks. In the last decades there has been a multitude of advances in miniaturizing sensors and computers, while greatly increasing their performance. As a result new devices are introduced into our daily lives that have a plethora of functions. Gathering information about the occupants is fundamental in adapting the smart environment according to preference and situation. There is a large number of different sensing devices available that can provide information about the user. They include cameras, accelerometers, GPS, acoustic systems, or capacitive sensors. The latter use the properties of an electric field to sense presence and properties of conductive objects within range. They are commonly employed in finger-controlled touch screens that are present in billions of devices. A less common variety is the capacitive proximity sensor. It can detect the presence of the human body over a distance, providing interesting applications in smart environments. Choosing the right sensor technology is an important decision in designing a smart environment application. Apart from looking at previous use cases, this process can be supported by providing more formal methods. In this work I present a benchmarking model that is designed to support this decision process for applications in smart environments. Previous benchmarks for pervasive systems have been adapted towards sensors systems and include metrics that are specific for smart environments. Based on distinct sensor characteristics, different ratings are used as weighting factors in calculating a benchmarking score. The method is verified using popularity matching in two scientific databases. Additionally, there are extensions to cope with central tendency bias and normalization with regards to average feature rating. Four relevant application areas are identified by applying this benchmark to applications in smart environments and capacitive proximity sensors. They are indoor localization, smart appliances, physiological sensing and gesture interaction. Any application area has a set of challenges regarding the required sensor technology, layout of the systems, and processing that can be tackled using various new or improved methods. I will present a collection of existing and novel methods that support processing data generated by capacitive proximity sensors. These are in the areas of sparsely distributed sensors, model-driven fitting methods, heterogeneous sensor systems, image-based processing and physiological signal processing. To evaluate the feasibility of these methods, several prototypes have been created and tested for performance and usability. Six of them are presented in detail. Based on these evaluations and the knowledge generated in the design process, I am able to classify capacitive proximity sensing in smart environments. This classification consists of a comparison to other popular sensing technologies in smart environments, the major benefits of capacitive proximity sensors, and their limitations. In order to support parties interested in developing smart environment applications using capacitive proximity sensors, I present a set of guidelines that support the decision process from technology selection to choice of processing methods.

Show publication details
Wacker, Fred; Urban, Bodo (Betreuer); Bieber, Gerald (Betreuer)

Arbeitsgeräteidentifikation mittels Smartwatches

2014

Rostock, Univ., Diplomarbeit, 2014

In zahlreichen Branchen wie etwa der Forstwirtschaft, dem Straßenbau und der verarbeitenden Industrie werden motorisierte, handgeführte Arbeitsgeräte verwendet, die schädliche Vibrationen auf das Hand-Arm-System ihres Benutzers übertragen können. Langfristig kann dies zu gravierenden Gesundheitsschäden führen. Bisherige Überwachungstechnik zum Schutz vor Vibrationsbelastung ist kostenintensiv und erfordert in der Regel zusätzliche Arbeitsschritte. Diese Arbeit stellt ein Konzept zur automatischen Erkennung handgeführter Arbeitsgeräte durch handelsübliche Smartwatches vor. Dabei werden auf Basis der Daten von Beschleunigungssensor, Drehratensensor und Mikrofon Merkmale extrahiert, um durch Verfahren des maschinellen Lernens eine Differenzierung verschiedener Arbeitsgeräte untereinander sowie von Inaktivität zu ermöglichen. Als Nachweis der Umsetzbarkeit wurde mit 6 Arbeitsgeräten und 13 Probanden eine Evaluierung durchgeführt. Diese ergab, dass sich die Benutzung verschiedener Arbeitsgeräte unter den Versuchsbedingungen mit hoher Genauigkeit unterscheiden ließ. Grundsätzlich gelang dies auch anhand der Merkmale einzelner Sensoren. Die prototypische Implementierung gestattet eine Echtzeitüberwachung sowie eine langfristige Verfolgung der persönlichen Exposition gegenüber schädlichen Vibrationen. Durch eine semiautomatische Annotierung neuer Daten ist sie zudem in der Lage, auf einfache Weise um neue Arbeitsgeräte erweitert zu werden.

Show publication details
Guest, Richard Matthew; Hurtado, Oscar Miguel; Henniger, Olaf

An Assessment of Methods for Image Recreation from Signature Time-series Data

2014

IET Biometrics, Vol.3 (2014), 3, pp. 159-166. Available online: 30 September 2013

Human signatures are widely used for biometric authentication. For automatic on-line signature verification, rather than storing an image of the completed signature, data is represented in the form of a time-series of pen position and status information allowing the extraction of temporal-based features. For visualization purposes, signature images need to be recreated from time-series data. In this paper we investigate the accuracy and verification performance of a series of interpolation methods for recreating a signature image from time-series data contained in two ISO/IEC data storage formats. Our experiments investigate dynamic data stored at various sample rates and signature images recreated at differing resolutions. Our study indicates possible best practice in terms of image recreation method, recreated image resolution, and temporal sample rate and assesses the effect of on the accuracy of reconstructed signature data.

Show publication details
Schader, Philipp; Kuijper, Arjan (Betreuer); Steiger, Martin (Betreuer)

Assistiertes Energiemanagement durch Informationsvisualisierung

2014

Darmstadt, TU, Bachelor Thesis, 2014

Diese Arbeit beschreibt Konzepte zur Visualisierung von Energienetzen sowie zur Darstellung und Parametrisierung von Simulationen solcher. Es werden Darstellungen beschrieben mit denen sich ein Stromnetz darstellen lässt, sodass der Betriebszustand in dem es sich befindet zu erkennen ist. Weiter wird die Integration eines Simulators beschrieben mit dem Ziel ein interaktives System zu gestalten, welches durch die enge Verzahnung der Generierung und Darstellung von Daten, tiefe Einblicke in die Struktur des Versorgungsnetzes ermöglicht. Ein besonderes Augenmerk richtet sich hierbei auf die Möglichkeit die Simulationsergebnisse untereinander vergleichen zu können. Der im Rahmen dieser Arbeit entwickelte Prototyp verwendet die Konzepte auf Pegeldaten deutscher Wasserstraßen und zeigt so dass die Konzepte auch für allgemeine Sensornetzwerke verwendet werden können. Durch die Beschreibung eines konkreten Anwendungsfalls wird die Tauglichkeit der erarbeiteten Konzepte überprüft.

Show publication details
Klamm, Christopher; Kuijper, Arjan (Betreuer); Burkhardt, Dirk (Betreuer)

Ausprägungen elektronischer Beteiligung in Industrie- und Entwicklungsländern: Ein anwendungsorientierter Vergleich am Beispiel Deutschland und Kenia

2014

Darmstadt, TU, Bachelor Thesis, 2014

Partizipation ist ein etabliertes Element der partizipatorischen Demokratie. Immer wieder werden Mechanismen entwickelt, um Partizipation zu erhöhen und zu festigen. Mit Hilfe der voranschreitenden Entwicklung von Informations- und Kommunikationstechnologien, eröffnen sich neue Möglichkeiten von Partizipationsansätzen. Diese finden auch zunehmend weltweiten Einsatz. Neue partizipatorische Formen verwenden ICT als Mittel zur Unterstützung der Partizipation (E-Partizipation). In welche Bahnen E-Partizipation bereits gelenkt wurde ist Gegenstand dieser Arbeit. Sie setzt sich mit der Ausprägung vorhandener E-Partizipationsformen auseinander und betrachtet dabei anwendungsbezogene Projekte. Das Untersuchungsumfeld wurde dabei auf einen Ländervergleich festgelegt. Es handelt sich um einen Vergleich zwischen Deutschland, als repräsentatives Industrieland und Kenia, als Repräsentant für ein Entwicklungsland. Dafür wird, mit Hilfe einer historischen und anwendungsorientierten Betrachtung der E-Partizipation in den Ländern, ein Kontext aufgestellt. Mit dessen Hilfe werden die E-Partizipationsbestrebungen in Deutschland und Kenia anschließend mittels einer aufgestellten Klassifikation vergleichend gegenübergestellt. Die Analyse zeigt, dass deutsche Projekte vermehrt staatlich (Top-Down) initiiert sind, wo-hingegen in Kenia häufiger eine nicht-staatliche Ausrichtung (Ground-Up) existent ist. Weiterhin ist in kenianischen Projekten die Form "Transparenz durch Dritte" stärker ausgeprägt, in Deutschland ist es hingegen die konsultative Form. Im Bereich des fokussierten Bedürfnisses überwiegt in Deutschland die soziale Bedürfnisbefriedung, während in Kenia auch noch Sicherheitsbedürfnisse bedeutsam sind. Im Bereich der ICT-Form zeigt sich eine ähnliche Verteilung innerhalb der Länder bei den Formen Alert, FAQ und Forum. Partielle Unterschiede sind in den Formen Blog und Bewertung ausgeprägt, starke Differenzen existieren dagegen bei den Formen Chat, Umfrage und Spiel als Partizipationsmittel. Für letztere gilt, dass Chat und Umfrage nur in deutschen und das Spiel nur in kenianischen Projekten verwendet wurden.

Show publication details
Vayanou, Maria; Katifori, Akrivi; Karvounis, Manos; Kourtis, Vassilis; Kyriakidi, Marialena; Roussou, Maria; Tsangaris, Manolis; Ioannidis, Yannis; Balet, Olivier; Prados, Thibaut; Keil, Jens; Engelke, Timo; Pujol, Laia

Authoring Personalized Interactive Museum Stories

2014

Mitchell, Alex (Ed.) et al.: Interactive Storytelling : 7th International Conference on Interactive Digital Storytelling. ICIDS 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8832), pp.37-48

Joint International Conference on Interactive Digital Storytelling (ICIDS) <7, 2014, Singapore>

CHESS is a research prototype system aimed at enriching museum visits through personalized interactive storytelling. Aspiring to replace traditional exhibit-centric descriptions by story-centric cohesive narrations with carefully-designed references to the exhibits, CHESS follows a plot-based approach, where the story authors create stories around pre-selected museum themes. In this paper we place the CHESS system within the Interactive Digital Narrative field, describing the main objectives and requirements addressed. We present the system's architecture and outline its overall functionality. We describe the underlying storytelling model using examples from the stories authored using the CHESS Authoring Tool. Finally, we report key results focusing on the authors' perspective for the creation of personalized stories.

Show publication details

Automated Kidney Detection and Segmentation in 3D Ultrasound

2014

Erdt, Marius (Ed.) et al.: Clinical Image-Based Procedures. Translational Research in Medical Imaging : Second International Workshop, CLIP 2013. Held in Conjunction with MICCAI 2013. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8361), pp. 83-90

International Workshop on Clinical Image-based Procedures (CLIP) <2, 2013, Nagoya, Japan>

Ultrasound provides the physical capabilities for a fast and save disease diagnosis in various medical scenarios including renal exams and patient trauma assessment. However, the experience of the ultrasound operator is the key element in performing ultrasound diagnosis. Thus, we like to introduce our automatic kidney detection and segmentation algorithm for 3D ultrasound. The approach utilizes basic kidney shape information to detect the kidney position. Following, the Level Set algorithm is applied to segment the detection result. In combination this method may help physicians and inexperienced trainees to achieve kidney detection and segmentation for diagnostic purposes.

Show publication details

Automated Urban Management Processes: Integrating a Graphical Editor for Modular Domain-Specific Languages into a 3D GIS

2014

Schrenk, Manfred (Ed.) et al.: REAL CORP 2014. Plan it Smart. Clever Solutions for Smart Cities : Proceedings of 19th International Conference on Urban Planning, Regional Development and Information Society. Schwechat, 2014, pp. 99-108

International Conference on Urban Planning, Regional Development and Information Society <19, 2014, Vienna, Austria>

In this paper we present the results of integrating a graphical editor for geospatial processing workflows into a 3D GIS. We use modular domain-specific languages (DSLs) that are tailored to specific application domains. The vocabulary consists of so-called recipes that are grouped into cookbooks representing the language for a certain application domain. Recipes can be reused in multiple cookbooks. This approach allows for a good usability as the user quickly becomes familiar with the domain-specific languages by recognizing common recipes. In this paper we also describe guidelines for choosing the right granularity for recipes which allows for complex rules while using simplest possible recipes. We also describe a workflow for domain-specific language design based on ontologies to identify the correct domain vocabulary. Our approach can be used to automate processing of geospatial datasets in the area of urban planning. To evaluate our approach we use the implemented graphical rule editor in a practical scenario and present it to a user group from the urban API project.

Show publication details
Brandherm, Florian; Kuijper, Arjan (Betreuer); Limper, Max (Betreuer)

Automatic Appearance-Preserving Generation of Compact 3D Models for the Web

2014

Darmstadt, TU, Bachelor Thesis, 2014

The goal of this thesis was to create a fully automatic processing pipeline to simplify big arbitrary triangle meshes to a degree that can be used inside a web page using WebGL. While the mesh complexity is decreased by orders of magnitude, the original meshes details (e.g. colors, normals) are preserved by capturing them in textures. These textures can then be applied to the simplified mesh to give it an appearance that is similar in detail as the original high resolution mesh. The proposed implementation makes it easy to incorporate such a simplified mesh into a website by providing an exporter that generates a web site with all necessary files in suitable file formats. Simplified, detail-preserving 3D models are generated in multiple independent steps: First, the mesh is simplified with the quadric edge collapse algorithm[9]. Then, a texture atlas is created by segmenting the simplified mesh and parameterizing the individual segments with Least Squares Conformal Maps[14]. After packing the individual segments into a texture atlas, the details of the high-resolution input mesh are captured in textures. At the end of this processing pipeline, the model is exported. The results show that the goal of creating file sizes that are small enough for a web page while preserving a reasonable amount of detail was reached. It is shown that the resulting files can compete with the alternative approach of creating interactive 3Dvisualizations with a series of pre-rendered images. The analysis of the results also shows that there is a lot of potential to increase the file size to detail ratio further.

Show publication details
Knöbelreiter, Patrick; Berndt, Rene; Ullrich, Torsten; Fellner, Dieter W.

Automatic Fly-through Camera Animations for 3D Architectural Repositories

2014

Coquillart, Sabine (Ed.) et al.: GRAPP 2014 : Proceedings of the International Conference on Computer Graphics Theory and Applications and International Conference on Information Visualization Theory and Applications. SciTePress, 2014, pp. 335-341

International Conference on Computer Graphics Theory and Applications (GRAPP) <9, 2014, Lisbon, Portugal>

Virtual fly-through animations through computer generated models are a strong tool to convey properties and the appearance of these models. In, e.g., architectural models the big advantage of such a fly-through animation is that it is possible to convey the structure of the model easily. However, the path generation is not always trivial, to get a good looking animation. The proposed approach in this paper can handle arbitrary 3D models and then extract a meaningful and good looking camera path. To visualize the path HTML/X3DOM is used and therefore it is possible to view the final result in a browser with X3DOM support.

Show publication details
Romann, René; Bieber, Gerald; Salomon, Ralf

Automatische Tremorerkennung mittels Smartphones und intelligenter Uhren

2014

Bieber, Gerald (Ed.) et al.: WOAR 2014 : Proceedings of the Workshop on Sensor-based Activity Recognition. Stuttgart: Fraunhofer Verlag, 2014, pp. 52-60

Workshop on Sensor-Based Activity Recognition (WOAR) <1, 2014, Rostock, Germany>

Dieser Tremor ist an und für sich nichts Schlimmes und ist bei allen Menschen vorhanden und beobachtbar. Doch kann ein verstärkter Tremor als Folge anderer Krankheitsbilder wie beispielsweise Parkinson oder in Folge körperlicher Extremzustände wie Unterzuckerung, Unterkühlung oder Stress auftreten und somit als Indikator für selbige dienen. Gegenwärtig wird die Tremorbestimmung ambulant im Krankenhaus durchgeführt, was für Patienten und Ärzte mit signifikantem Aufwand und somit hohen Kosten für das Gesundheitswesen verbunden ist. In diesem Beitrag wird untersucht, inwiefern sich der Tremor auch mit handelsüblichen Geräten wie Smartphones und Smartwatches vom Patienten selbstständig bestimmen lässt. Die durchgeführten Experimente weisen darauf hin, dass dies mit den Geräten der neusten Generation in vielen Fällen einfach und zuverlässig möglich ist.

Show publication details
Neumann, Stephan; Kuijper, Arjan (Betreuer); Braun, Andreas (Betreuer)

Automotive Interfaces Using an Interactive Armrest

2014

Darmstadt, TU, Bachelor Thesis, 2014

Due to the rapid technological development of cars and their entertainment and infotainment systems, drivers are confronted with feature-rich interfaces that can become both confusing and distracting. Therefore, new ways of interaction between driver and car have to be developed in order to reduce driver distraction to a minimum. This is relevant to the safety of both the driver and road users surrounding him. In this thesis, gesture based interaction in the automotive is examined. The main focus is gestural interaction using capacitive sensors. In this area, an overview over related work is given. Challenges in developing a capacitive system for gesture based interaction in the automotive environment are presented and discussed. Afterwards, a model for a gesture-based input system using an augmented armrest is proposed. A prototypical system is implemented in order to test the possibilities and limitations of the proposed model. This system is then evaluated in order to test its general viability and to compare different kinds of gestures for interacting with in-car systems.

Show publication details

A Benchmarking Model for Sensors in Smart Environments

2014

Aarts, Emile (Ed.) et al.: Ambient Intelligence : European Conference, AmI 2014. Berlin, Heidelberg, New York: Springer, 2014. (Lecture Notes in Computer Science (LNCS) 8850), pp. 242-257

European Conference on Ambient Intelligence (AmI) <2014, Eindhoven, The Netherlands>

In smart environments, developers can choose from a large variety of sensors supporting their use case that have specific advantages or disadvantages. In this work we present a benchmarking model that allows estimating the utility of a sensor technology for a use case by calculating a single score, based on a weighting factor for applications and a set of sensor features. This set takes into account the complexity of smart environment systems that are comprised of multiple subsystems and applied in non-static environments. We show how the model can be used to find a suitable sensor for a use case and the inverse option to find suitable use cases for a given set of sensors. Additionally, extensions are presented that normalize differently rated systems and compensate for central tendency bias. The model is verified by estimating technology popularity using a frequency analysis of associated search terms in two scientific databases.

Show publication details
Damer, Naser; Opel, Alexander

Biometric Source Weighting in Multi-Biometric Fusion: Towards a Generalized and Robust Solution

2014

European Association for Speech, Signal and Image Processing (EURASIP): 2014 Proceedings of the 22nd European Signal Processing Conference (EUSIPCO), pp. 1382-1386

European Signal Processing Conference (EUSIPCO) <22, 2014, Lisbon, Portugal>

This work presents a new weighting algorithm for biometric sources within a score-level multi-biometric system. Those weights are used in the effective and widely used weighted sum fusion rule to produce multi-biometric decisions. The presented solution is mainly based on the characteristic of the overlap region between the genuine and imposter scores distributions. It also integrates the performance of the biometric source represented by its equal error rate. This solution aims at avoiding the shortcomings of previously proposed solutions such as low generalization abilities and sensitiveness to outliers. The proposed solution is evaluated along with the state of the art and best practice techniques. The evaluation was performed on two databases, the Biometric Scores Set BSSR1 and the Extended Multi Modal Verification for Teleservices and Security applications database and a satisfying and stable performance was achieved.

Show publication details

Biometrie: Technik, Mythen, Praxisbeispiele: Die Gesellschaft muss intensive Diskussionen führen

2014

BvD-News, (2014), 3, pp. 30-32

Unter dem Begriff Biometrie ist das automatische Erkennen von Individuen anhand deren Verhalten und ihrer biologischen Charakteristika zu verstehen. In einer zunehmend technisierten Welt kann sie immer dann zum Einsatz kommen, wenn es darum geht, personengebundene Zugriffs- oder Zutrittsberechtigungen zu prüfen. Das kann der Zutritt zur eigenen Wohnung genauso sein wie die Einreise in einen fremden Staat. Zahlreiche Mythen ranken um diese Technologie: Sie sei für erhöhte Sicherheit geeignet, diene der Überwachung, ließe sich leicht durch Fälschungen umgehen und würde die Überwachung befördern. Diese Mythen schürten in der Vergangenheit auch eine gehörige Portion Angst, nicht zuletzt allein deshalb, weil ihre Funktionsweise nicht wirklich bekannt ist. Dieser Artikel will mit den größten Missverständnissen aufräumen.

Show publication details
Brömme, Arslan

BIOSIG 2014: Proceedings of the 13th International Conference of the Biometrics Special Interest Group

2014

Annual International Conference of the Biometrics Special Interest Group (BIOSIG) <13, 2014, Darmstadt, Germany>

GI-Edition - Lecture Notes in Informatics (LNI) P-230

Biometrics provides efficient and reliable solutions to recognize individuals. With increasing number of identity theft and misuse incidents we do observe a significant fraud in e-commerce and thus growing interests on trustworthiness of person authentication. Nowadays we find biometric applications in areas like border control, national ID cards, e-banking, e-commerce, e-health etc. Large-scale applications such as the European Union Visa Information System (VIS) and Unique Identification (UID) in India require high accuracy and also reliability, interoperability, scalability, system reliability and usability. Many of these are joint requirements also for forensic applications. Multimodal biometrics combined with fusion techniques can improve recognition performance. Efficient searching or indexing methods can accelerate identification efficiency. Additionally, quality of captured biometric samples can strongly influence the performance. BIOSIG 2014 offers you once again a platform for international experts' discussions on biometrics research and the full range of security applications.