Non-Photorealistic Computer Graphics Library

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Found 8 item(s) authored by "Jan Fischer" .

Technical Report A Pointillism Style for the Non-Photorealistic Display of Augmented Reality Scenes
Jan Fischer, Dirk Bartz.
Wilhelm Schickard Institute for Computer Science, University of Tübingen, No. WSI-2005-05, May, 2005. [BibTeX]

Proceedings Artistic Reality: Fast Brush Stroke Stylization for Augmented Reality
Jan Fischer, Dirk Bartz, Wolfgang Straßer.
ACM Symposium on Virtual Reality Software and Technology (VRST), pp. 155--158, Monterey, November, 2005. [BibTeX]

Article Evaluation of Real-World and Computer-Generated Stylized Facial Expressions
Christian Wallraven, Heinrich H. Bülthoff, Douglas W. Cunningham, Jan Fischer, Dirk Bartz.
ACM Transactions on Applied Perception (TAP), Vol. 4, No. 3, pp. 1544--3558, November, 2007. [BibTeX]

Proceedings Illustrative Display of Hidden Iso-Surface Structures

Author(s): Jan Fischer, Dirk Bartz, Wolfgang Straßer.
Proceedings: Proceedings of IEEE Visualization (VIS'05), pp. 663--670, Minneapolis, October, 2005.
[BibTeX] [DOI] Find this paper on Google

Indirect volume rendering is a widespread method for the display of volume datasets. It is based on the extraction of polygonal isosurfaces from volumetric data, which are then rendered using conventional rasterization methods. Whereas this rendering approach is fast and relatively easy to implement, it cannot easily provide an understandable display of structures occluded by the directly visible iso-surface. Simple approaches like alpha-blending for transparency when drawing the iso-surface often generate a visually complex output, which is difficult to interpret. Moreover, such methods can significantly increase the computational complexity of the rendering process. In this paper, we therefore propose a new approach for the illustrative indirect rendering of volume data in real-time. This algorithm emphasizes the silhouette of objects represented by the iso-surface. Additionally, shading intensities on objects are reproduced with a monochrome hatching technique. Using a specially designed two-pass rendering process, structures behind the front layer of the iso-surface are automatically extracted with a depth peeling method. The shapes of these hidden structures are also displayed as silhouette outlines. As an additional option, the geometry of explicitly specified inner objects can be displayed with constant translucency. Although these inner objects always remain visible, a specific shading and depth attenuation method is used to convey the depth relationships. We describe the implementation of the algorithm, which exploits the programmability of state-of-the-art graphics processing units (GPUs). The algorithm described in this paper does not require any preprocessing of the input data or a manual defitinion of inner structures. Since the presented method works on iso-surfaces, which are stored as polygonal datasets, it can also be applied to other types of polygonal models.

Technical Report Real-time Cartoon-like Stylization of AR Video Streams on the GPU
Jan Fischer, Dirk Bartz.
Wilhelm Schickard Institute for Computer Science, University of Tübingen, No. WSI-2005-18, Germany, September, 2005. [BibTeX]

Proceedings Reality Tooning: Fast Non-Photorealism for Augmented Video Streams
Jan Fischer, Dirk Bartz, Wolfgang Straßer.
Proceedings of IEEE and ACM International Symposium on Mixed and Augmented Reality (ISMAR), Vienna, October, 2005. [BibTeX]

Proceedings Stylized Augmented Reality for Improved Immersion
Jan Fischer, Dirk Bartz, Wolfgang Straßer.
IEEE Virtual Reality, pp. 195--202, Bonn, Mar 12-16th, 2005. [BibTeX]

Article Stylized Depiction in Mixed Reality
Jan Fischer, Michael Haller, Bruce H. Thomas.
International Journal of Virtual Reality, Vol. 7, No. 4, pp. 71--79, December, 2008. [BibTeX]

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