Non-Photorealistic Computer Graphics Library

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Found 10 item(s) authored by "Dirk Bartz" .

Technical Report A Pointillism Style for the Non-Photorealistic Display of Augmented Reality Scenes

Author(s): Jan Fischer, Dirk Bartz.
Technical Report: Wilhelm Schickard Institute for Computer Science, University of Tübingen, No. WSI-2005-05, May, 2005.
[BibTeX] Find this paper on Google

Abstract:
The ultimate goal of augmented reality is to provide the user with a view of the surroundings enriched by virtual objects. Practically all augmented reality systems rely on standard real-time rendering methods for generating the images of virtual scene elements. Although such conventional computer graphics algorithms are fast, they often fail to produce sufficiently realistic renderings. The use of simple lighting and shading methods, as well as the lack of knowledge about actual lighting conditions in the real surroundings, cause virtual objects to appear artificial. We have recently proposed a novel approach for generating augmented reality images. Our method is based on the idea of applying stylization techniques for reducing the visual realism of both the camera image and the virtual graphical objects. Special non-photorealistic image filters are applied to the camera video stream. The virtual scene elements are rendered using non-photorealistic rendering methods. Since both the camera image and the virtual objects are stylized in a corresponding way, they appear very similar. As a result, graphical objects can become indistinguishable from the real surroundings. Here, we present a new method for the stylization of augmented reality images. This approach generates a painterly "brush stroke" rendering. The resulting stylized augmented reality video frames look similar to paintings created in the "pointillism" style. We describe the implementation of the camera image filter and the non-photorealistic renderer for virtual objects. These components have been newly designed or adapted for this purpose. They are fast enough for generating augmented reality images in real-time and are customizable. The results obtained using our approach are very promising and show that it improves immersion in augmented reality.

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
Jan Fischer, Dirk Bartz, Wolfgang Straßer.
Proceedings of IEEE Visualization (VIS'05), pp. 663--670, Minneapolis, October, 2005. [BibTeX]

Proceedings Illustrative Rendering of Segmented Anatomical Data
Zean Salah, Dirk Bartz, Wolfgang Straßer.
Symposium on Simulation and Visualization, Magdeburg, 2005. [BibTeX]

Proceedings Illustrative Rendering Techniques for Visualization: Future of Visualization or Just Another Technique?
Dirk Bartz, Hans Hagen, Victoria Interrante, Kwan-Liu Ma, Bernhard Preim.
Proceedings of the IEEE Visualization 2005 October 23-28, Minneapolis, MN, USA (VIS'05), pp. 715--718, Los Alamitos, CA, USA, IEEE Computer Society, 2005. [BibTeX]

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]

Book Visualization in Medicine: Theory, Algorithms, and Applications
Bernhard Preim, Dirk Bartz.
Morgan Kaufmann, 2007. [BibTeX]

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