Research Projects

My main research interests area: information visualization, visual analytics, human-computer interaction, and computer supported-cooperative work.

This page in in urgent need of an update. I'm working on it.

Mobile Visualization
Animation vs. Small Multiples
Micro Visualization
Interaction for Word-Scale Visualizations
Collaborative Information Visualization
Perception of visual variables on tiled wall displays
Stackables Tangibles for faceted search CoCoNutTrix
A study on retrofitting for collaborative information visualization
Collaborative Visual Analytics in document collections
Collaborative analysis of hierarchical data
PhD Thesis
Overview and Errata of my PhD Thesis
Coupling styles in collaborative work Design Considerations
for co-located collaborative visualization
A study of data analysis processes in collaborative work iLoupe and iPodLoupe for interacting with visualization on a touch display Lark
Coordinating multiple views for collaboration
Information Visualization Techniques
Hybrid Image Vis
using hybrid images for visualization and communication
phyllotactic patterns for tree layout
relations in hierarchical data
personalizing typed text through visualization
visualization for multimedia databases
a comparative study of several dual-scale charts
a study on how to best draw directed edges in graphs
Theory, Literature Reviews, and Opinion Pieces
Reaching Broader Audiences Empirical evaluation in InfoVis: Seven scenarios Evaluation in a large company context Heuristic evaluation for information visualization Grounded evaluation for information visualization
Interaction Techniques for Visualization
MultitouchSelection how to support multi-touch multi-object selection
Visualization General
VisKeywords understanding visualization through keyword analysis
Non-photorealistic Rendering
Lenses for illustration.
A study of NPR line illustration (external link) Interactive text illustration
Miscellaneous and Fun Projects
A simple force-directed layout to show my co-authorship network A video coding tool for qualitative data analysis Convenience tool for getting color code for OpenGL programming Applet for calculating the visual angle of an object based on viewing distance. How I built a multi-touch pad from scratch

Research Path

Here is a brief history of how I ended up with the types of projects you see above:

I started research in the area of computer graphics and in particular non-photorealistic rendering (NPR) - a very hot topic at the University of Magdeburg where I studied from 1999-2004. Towards the end of my studies there I got more and more involved in information visualization. First, I worked as a research assistant on applications for visualization of database content & queries and finished my studies in Magdeburg with work on hierarchical data visualization. After my Diplom, I went to the University of Calgary and focused my research more on collaborative information visualization. I also work(ed) on a few projects in other areas such as the evaluation of information visualizations, social data analysis, and the visualization of hierarchical data. Then I focused for a bit on wall-sized display visualization and these days I am interested in the opposite - very small, micro, visualizations.