05 Fakultät Informatik, Elektrotechnik und Informationstechnik

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/6

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Institute: search.filters.UBSInstitut.Institut für Visualisierung und Interaktive SystemeAuthor: search.filters.author.Ertl, Thomas

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Now showing 1 - 5 of 5
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    Dynamic ontology supported user interface for personalized decision support
    (2012) Bosch, Harald; Thom, Dennis; Heinze, Geoffrey-Alexeij; Wokusch, Stefan; Ertl, Thomas
    European citizens are increasingly aware of the influence of air quality and weather on their health and quality of life. At the same time, more environmental information is freely available through a plethora of websites, dedicated portals, and web services. In order to exploit these data for personal decisions one has to identify, retrieve, and combine the information that is relevant to one's personal situation, planned activity, and information need. Often, this task is hindered by different data formats, display styles and data resolutions. The PESCaDO system is a web-based decision support system addressing this issue. The inquiry to the system, as well as the system's result, can cover a broad range of environmental aspects and personal situations and is therefore quite complex. In this work we present a novel approach on how the system can actively assist users in all steps of the decision making process, especially by enhancing the user interaction. This approach combines an intelligent dialog steering method based on analyzing the domain ontology with flexible, dynamic data visualizations for a situation depending orchestration of data sources. Both aspects have been evaluated in on-line user studies, as well as with an expert evaluation of the whole system.
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    The design and implementation of a presentation system for interactive 3D graphics applications
    (2005) Stegmaier, Simon; Klein, Thomas; Strengert, Magnus; Ertl, Thomas
    We present the design and implementation of a stand-alone system for presenting interactive 3D graphics applications and arbitrary multimedia contents to a public audience. The description includes technical details regarding the construction of a sturdy case to accommodate touchscreen, PC, video projector, and sound equipment, and details involved in the design of the presentation software. The presented system was evaluated during a week-long exhibition with several hundreds of users.
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    A depth-cueing scheme based on linear transformations in tristimulus space
    (2002) Weiskopf, Daniel; Ertl, Thomas
    We propose a generic and flexible depth-cueing scheme which subsumes many well-known and new color-based depth-cueing approaches. In particular, it includes standard intensity depth-cueing and rather neglected pure saturation depth-cueing. A couple of new combinations and variations of depth cues are presented. Their usefulness is demonstrated in many different fields of application, reaching from non-photorealistic rendering to information visualization. In addition to cues based on a geometric concept of depth, an abstract visualization approach in the form of semantic depth-cueing is proposed. Our depth-cueing scheme is based on linear transformations in the 3D tristimulus space of colors and on weighted sums of colors. Since all of the required operations are supported by contemporary consumer graphics hardware, the depth-cueing scheme can be implemented without performance cutbacks. Therefore, any real-time rendering application can be enriched by sophisticated depth-cueing.
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    Verwendung von Scalable Vector Graphics und MathML in web-basierten Lernumgebungen
    (2002) Rotard, Martin; Schweikhardt, Waltraud; Ertl, Thomas
    In web-basierten Lernumgebungen werden Rastergraphiken eingesetzt, um Skizzen und Formeln darzustellen. Dies erschwert den Austausch und die Wiederverwendung von Lehrmaterialien unter Lernenden und Lehrenden. Dieser Beitrag stellt das Vektorgraphikformat SVG (Scalable Vector Graphics) und MathML, das Format zur Beschreibung mathematischer Ausdrücke, vor. Die Möglichkeiten des SVG-Formats reichen von der Darstellung einfacher Graphikelemente bis hin zu komplexen Filtern und Beleuchtungseffekten. In MathML lässt sich der inhaltliche Zusammenhang oder die Darstellung von mathematischen Ausdrücken beschreiben. Das letzte Kapitel gibt einen Ausblick auf Anwendungsfelder von web-basierten Lernumgebungen mit SVG und MathML.
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    Studies and design considerations for animated transitions between small-scale visualizations
    (2023) Huth, Franziska; Blascheck, Tanja; Koch, Steffen; Ertl, Thomas
    Small-scale visualizations can augment text, show information on mobile devices, or geographical information on a map. In such situations, there is often not enough space to show complex data with approaches like juxtaposed visualizations. To alleviate this issue, we propose the use of animated transitions between several small-scale visualizations. We discuss design considerations for animated transitions between small-scale visualizations and differences to normal-sized visualizations. Further, we present the results of two online studies on the effectiveness of those animated transitions to convey information and attribute relations, as well as the mental load of following the animated transitions. As a result, we found that animated transitions between visualizations are understandable in small scale, but performance depends on the specific task and the type of operation carried out with the animated transition.