Non-Photorealistic Computer Graphics Library

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Found 12 item(s) authored by "Jürgen Döllner" .
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Proceedings Blueprints: illustrating architecture and technical parts using hardware-accelerated non-photorealistic rendering
Marc Nienhaus, Jürgen Döllner.
Graphics Interface (GI'04), pp. 49--56, Canadian Human-Computer Communications Society, 2004. [BibTeX]

Article Depicting Dynamics Using Principles of Visual Art and Narrations
Marc Nienhaus, Jürgen Döllner.
IEEE Computer Graphics and Applications, Vol. 25, No. 3, pp. 40--51, May/June, 2005. [BibTeX]

Proceedings Dynamic Glyphs - Depicting Dynamics in Images of 3D Scenes
Marc Nienhaus, Jürgen Döllner.
Proceedings of Third International Symposium on Smart Graphics, pp. 102--111, July, 2003. [BibTeX]

Proceedings Edge-Enhancement – An Algorithm for Real-Time Non-Photorealistic Rendering
Marc Nienhaus, Jürgen Döllner.
11th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG), 2003. [BibTeX]

In Book GPU Gems II: Programming Techniques for High Performance Graphics and General-Purpose Computation
Marc Nienhaus, Jürgen Döllner.
M. Pharr, Blueprint Rendering and Sketchy Drawings, pp. 235--252, Addison-Wesley Professional, 2005. [BibTeX]

Proceedings Illustrating Design and Spatial Assembly of Interactive CSG
Marc Nienhaus, Florian Kirsch, Jürgen Döllner.
Proceedings of 4th International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa (ACM AFRIGRAPH 2006), pp. 91--98, Cape Town, South Africa, January 25 - 27, 2006. [BibTeX]

Proceedings Illustrating Terrains using Direction of Slope and Lighting
Kevin Buchin, Mario Costa Sousa, Jürgen Döllner, Faramarz Samavati, Maike Walther.
4th ICA Mountain Cartography Workshop, Vall de Núria, Catalunya, Spain, 30th September - 2nd. October 2004, 2004. [BibTeX]

Proceedings Illustrative Visualization of 3D City Models
Jürgen Döllner, Henrik Buchholz, Marc Nienhaus, Florian Kirsch.
Proceedings of SPIE - Visualization and Data Analysis (VDA 2005), San Jose, CA, USA, 2005. [BibTeX]

Article Image and Video Abstraction by Anisotropic Kuwahara Filtering
Jan Eric Kyprianidis, Henry Kang, Jürgen Döllner.
Computer Graphics Forum (Special Issue on Pacific Graphics 2009), Vol. 28, No. 7, pp. 1955--1963, October, 2009. [BibTeX]

Proceedings Sketchy Drawings

Author(s): Marc Nienhaus, Jürgen Döllner.
Proceedings: AFRIGRAPH '04: Proceedings of the 3rd international conference on Computer graphics, virtual reality, visualisation and interaction in Africa, pp. 73--81, Stellenbosch, South Africa, ACM Press, 2004.
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Abstract:
In non-photorealistic rendering sketchiness is essential to communicate visual ideas and can be used to illustrate drafts and concepts in, for instance, architecture and product design. In this paper, we present a hardware-accelerated real-time rendering algorithm for drawings that sketches visually important edges as well as inner color patches of arbitrary 3D objects even beyond the geometrical boundary. The algorithm preserves edges and color patches as intermediate rendering results using textures. To achieve sketchiness it applies uncertainty values in image-space to perturb texture coordinates when accessing intermediate rendering results. The algorithm adjusts depth information derived from 3D objects to ensure visibility when composing sketchy drawings with arbitrary 3D scene contents. Rendering correct depth values while sketching edges and colors beyond the boundary of 3D objects is achieved by depth sprite rendering. Moreover, we maintain frame-to-frame coherence because consecutive uncertainty values have been determined by a Perlin noise function, so that they are correlated in image-space. Finally, we introduce a solution to control and predetermine sketchiness by preserving geometrical properties of 3D objects in order to calculate associated uncertainty values. This method significantly reduces the inherent shower-door effect.

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