171 research outputs found
Contributions to virtual reality
153 p.The thesis contributes in three Virtual Reality areas: Âż Visual perception: a calibration algorithm is proposed to estimate stereo projection parameters in head-mounted displays, so that correct shapes and distances can be perceived, and calibration and control procedures are proposed to obtain desired accommodation stimuli at different virtual distances.Âż Immersive scenarios: the thesis analyzes several use cases demanding varying degrees of immersion and special, innovative visualization solutions are proposed to fulfil their requirements. Contributions focus on machinery simulators, weather radar volumetric visualization and manual arc welding simulation.Âż Ubiquitous visualization: contributions are presented to scenarios where users access interactive 3D applications remotely. The thesis follows the evolution of Web3D standards and technologies to propose original visualization solutions for volume rendering of weather radar data, e-learning on energy efficiency, virtual e-commerce and visual product configurators
Contributions to virtual reality
153 p.The thesis contributes in three Virtual Reality areas: Âż Visual perception: a calibration algorithm is proposed to estimate stereo projection parameters in head-mounted displays, so that correct shapes and distances can be perceived, and calibration and control procedures are proposed to obtain desired accommodation stimuli at different virtual distances.Âż Immersive scenarios: the thesis analyzes several use cases demanding varying degrees of immersion and special, innovative visualization solutions are proposed to fulfil their requirements. Contributions focus on machinery simulators, weather radar volumetric visualization and manual arc welding simulation.Âż Ubiquitous visualization: contributions are presented to scenarios where users access interactive 3D applications remotely. The thesis follows the evolution of Web3D standards and technologies to propose original visualization solutions for volume rendering of weather radar data, e-learning on energy efficiency, virtual e-commerce and visual product configurators
Analysis domain model for shared virtual environments
The field of shared virtual environments, which also
encompasses online games and social 3D environments, has a
system landscape consisting of multiple solutions that share great functional overlap. However, there is little system interoperability between the different solutions. A shared virtual environment has an associated problem domain that is highly complex raising difficult challenges to the development process, starting with the architectural design of the underlying system. This paper has two main contributions. The first contribution is a broad domain analysis of shared virtual environments, which enables developers to have a better understanding of the whole rather than the part(s). The second contribution is a reference domain model for discussing and describing solutions - the Analysis Domain Model
Three-dimensional photography as a new technique to make didactic presentations more attractive
In the 21st century, the form of presenting information plays an incredibly important role in
arousing interest in research problems. Stereoscopy is among the imaging techniques that have evoked
much interest in the recent years. Its numerous applications that can be observed in various fields (such as
medicine, space science, law, marketing, or entertainment industry) suggest that we should also use this
technology for didactic purposes. The aim of the article is to discuss the process of creating threedimensional
photography and the opportunities offered by stereoscopy, which makes it possible to obtain
images with depth effect and impression of solidity. The authors describe different ways to obtain threedimensional
images and the devices applied in the process, as well as techniques of presenting threedimensional
material to a wider audience. The methods of free-viewing (the oldest method of viewing
stereoscopic images), anaglyph (a simple method applied in printing and displaying static images and
movies on screen), lenticular raster (employing a series of narrow vertical cylindrical lenses), and
stereoscopy (in which mirrors, lenses, prisms, or filters are used) are discussed. Also, the application of
computer technology is reviewed and the ways in which stereoscopy can benefit from this medium owing
to the use of LCD shutter glasses. Contemporary technology offers considerable opportunities, at the
same time posing ever-increasing demands, which are mentioned in the paper, too. Teaching is most
effective when information is received through multiple channels, combining verbal and visual messages.
Owing to 3D images, the recipients grasp more information details, remember them longer, and are more
interested in the message content. Creating didactic presentations with the use of three-dimensional
photographs or films is presented as a way of arousing interest, allowing direct participation in the
cognitive process, and facilitating the reception of the transmitted content
Web-based Stereoscopic Collaboration for Medical Visualization
Medizinische Volumenvisualisierung ist ein wertvolles Werkzeug zur Betrachtung von Volumen- daten in der medizinischen Praxis und Lehre. Eine interaktive, stereoskopische und kollaborative Darstellung in Echtzeit ist notwendig, um die Daten vollstaÌndig und im Detail verstehen zu koÌnnen. Solche Visualisierung von hochaufloÌsenden Daten ist jedoch wegen hoher Hardware- Anforderungen fast nur an speziellen Visualisierungssystemen moÌglich. Remote-Visualisierung wird verwendet, um solche Visualisierung peripher nutzen zu koÌnnen. Dies benoÌtigt jedoch fast immer komplexe Software-Deployments, wodurch eine universelle ad-hoc Nutzbarkeit erschwert wird. Aus diesem Sachverhalt ergibt sich folgende Hypothese: Ein hoch performantes Remote- Visualisierungssystem, welches fuÌr Stereoskopie und einfache Benutzbarkeit spezialisiert ist, kann fuÌr interaktive, stereoskopische und kollaborative medizinische Volumenvisualisierung genutzt werden.
Die neueste Literatur uÌber Remote-Visualisierung beschreibt Anwendungen, welche nur reine Webbrowser benoÌtigen. Allerdings wird bei diesen kein besonderer Schwerpunkt auf die perfor- mante Nutzbarkeit von jedem Teilnehmer gesetzt, noch die notwendige Funktion bereitgestellt, um mehrere stereoskopische PraÌsentationssysteme zu bedienen. Durch die Bekanntheit von Web- browsern, deren einfach Nutzbarkeit und weite Verbreitung hat sich folgende spezifische Frage ergeben: KoÌnnen wir ein System entwickeln, welches alle Aspekte unterstuÌtzt, aber nur einen reinen Webbrowser ohne zusaÌtzliche Software als Client benoÌtigt?
Ein Proof of Concept wurde durchgefuÌhrt um die Hypothese zu verifizieren. Dazu gehoÌrte eine Prototyp-Entwicklung, deren praktische Anwendung, deren Performanzmessung und -vergleich.
Der resultierende Prototyp (CoWebViz) ist eines der ersten Webbrowser basierten Systeme, welches fluÌssige und interaktive Remote-Visualisierung in Realzeit und ohne zusaÌtzliche Soft- ware ermoÌglicht. Tests und Vergleiche zeigen, dass der Ansatz eine bessere Performanz hat als andere aÌhnliche getestete Systeme. Die simultane Nutzung verschiedener stereoskopischer PraÌsen- tationssysteme mit so einem einfachen Remote-Visualisierungssystem ist zur Zeit einzigartig. Die Nutzung fuÌr die normalerweise sehr ressourcen-intensive stereoskopische und kollaborative Anatomieausbildung, gemeinsam mit interkontinentalen Teilnehmern, zeigt die Machbarkeit und den vereinfachenden Charakter des Ansatzes. Die Machbarkeit des Ansatzes wurde auch durch die erfolgreiche Nutzung fuÌr andere AnwendungsfaÌlle gezeigt, wie z.B. im Grid-computing und in der Chirurgie
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