Work

Teaching

• class on Advanced Introduction to Computer Graphics, CPSC 601.64 (co-taught): fall 2005
• class on Non-Photorealistic Computer Graphics (co-taught): summer 2004
• tutorial Rendering: summer 2001, summer 2002, summer 2004
• tutorial Introduction to Computer Graphics: winter 2000/01, winter 2001/02, winter 2003/04
• advising of student theses

Research

• application of computer graphic techniques to interactive visualization on large and high-resolution displays
• non-photorealistic rendering (NPR), in particular:
• high quality illustration and vector graphic rendering
• application of non-photorealistic rendering in illustration and visualization
• interactive and real-time non-photorealistic rendering, in particular, line and pen-and-ink techniques
• OpenNPAR project (includes images, videos, and demos)
• see my research topics page and my publications page

Doctoral thesis

• »Capturing the Essence of Shape from Polygonal Meshes«, submitted on November 19, 2003 and defended on April 16, 2004.

Diplom thesis

• In my Diplom thesis I worked on object-independent style alteration in line drawings.

Images

	Interactive Canvas Using large, direct-touch displays, a non-photorealistic painting is made interactive, allowing the work with many strokes simultaneously, and users can modify strokes even after they have been placed. Created together with Martin Schwarz (this image was created by him) and Sheelagh Carpendale. Presented as a paper at NPAR 2007.
	Pen-and-Ink Rendering for Implicit Surfaces A fast approximate silhouette detection technique coupled with a surfel-based hidden line removal and stippling allows us to render dynamically changing implicit models interactively. Created together with Ryan Schmidt and Brian Wyvill. Presented as a paper at NPAR 2007 and a technical sketch at SIGGRAPH 2006.
	NPR Lenses Based on the G-Strokes technique, we specify line stylization and line distortion in an object-independent manner. Created together with Petra Neumann and Sheelagh Carpendale. Presented as a paper at Smart Graphics 2007 and a poster at NPAR 2006.
	G-Strokes This technique allows to capture, maintain, and process line styles for NPR line drawings in a very flexible way. Created together with Angela Brennecke. Published as a article in Computers & Graphics in 2006.
	High Quality Hatching Rendering of hatched images for on-screen depiction and high quality reproduction in print. Created together with Johannes Zander, Stefan Schlechtweg, and Thomas Strothotte. Published as a paper at Eurographics 2004 and as a technical report with more details.
	Hybrid Rendering The shown images are frames from an animation that successively emphasizes the individual bones of a toe using non-photorealistic line rendering with a smooth transition between photorealistic and non-photorealistic style. Created together with Roland Jesse and Bernd Nettelbeck. See the technical report (2004).
	Knot A line drawing generated with the OpenNPAR system. The applied line style suggests the usage of oil paint. See the paper at Pacific Graphics 2003.
	Bunny This image was also rendered using the OpenNPAR system. Here a charcoal texture was used. See the paper at Pacific Graphics 2003.
	Engine Generated with OpenNPAR as well. Demonstrates white chalk on a blackboard. See the paper at Pacific Graphics 2003.
	Sketchy Style Non-photorealistic visualization of the Kaiserpfalz building. See the paper at Computer Graphics International 1999.
	Romanesque Elements Non-photorealistic visualization of the Kaiserpfalz building with Romanesque style elements emphasized. See the paper at Computer Graphics International 1999.
	Mosaique Image of the Kaiserpfalz The small images are photographs taken during the excarvation in the 70's, the large image is a computer-generated image of the virtual reconstruction. Created together with Maic Masuch and Niklas Röber. Large version (2,2 MB).
	Hybrid Rendering Combination of photorealistic and non-photorealistic elements that were embedded into a photo. Created with Bert Freudenberg, Maic Masuch, and Niklas Röber.