Non-Photorealistic Computer Graphics Library

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Found 31 item(s) authored in "2007".
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Proceedings Engaging viewers through nonphotorealistic visualizations
Laura Tateosian, Christopher G. Healey, James T. Enns.
NPAR '07: Proceedings of the 5th international symposium on Non-photorealistic animation and rendering, pp. 93--102, New York, NY, USA, ACM, 2007. [BibTeX]

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

Proceedings Hardware-accelerated Stippling of Surfaces derived from Medical Volume Data
Alexandra Baer, Christian Tietjen, Ragnar Bade, Bernhard Preim.
Eurographics/IEEE-VGTC Symposium on Visualization, pp. 235--242, 2007. [BibTeX]

Proceedings Highlight lines for conveying shape
Doug DeCarlo, Szymon Rusinkiewicz.
NPAR '07: Proceedings of the 5th international symposium on Non-photorealistic animation and rendering, pp. 63--70, New York, NY, USA, ACM, 2007. [BibTeX]

Article Highly stylised animation
Fabian Di Fiore, Frank Van Reeth, John Patterson, Philip Willis.
The Visual Computer, Vol. 24, No. 2, pp. 105--123, 2007. [BibTeX]

Article Humanistic Oriental art created using automated computer processing and non-photorealistic rendering
Adrian David Cheok, Zheng Shawn Lim, Roger Thomas KC Tan.
Computers & Graphics, Vol. 31, No. 2, pp. 280--291, April, 2007. [BibTeX]

Article Image-based Painterly Rendering by Evolutionary Algorithm
Uday K. Chakraborty, Hyung Woo Kang, Paul P. Wang.
New Mathematics and Natural Computation, Vol. 3, No. 2, pp. 239--257, 2007. [BibTeX]

Article Improving the Sketch-Based Interface
Richard Pusch, Faramarz Samavati, Ahmad Nasri, Brian Wyvill.
The Visual Computer, Vol. 23, No. 9--11, pp. 955--962, September, 2007. [BibTeX]

Article Interactive Illustrative Rendering on Mobile Devices
Jingshu Huang, Brian Bue, Avin Pattath, David Ebert, Krystal M. Thomas.
IEEE Computer Graphics and Applications, Vol. 27, No. 3, pp. 48--56, 2007. [BibTeX]

Article Interactive Tensor Field Design and Visualization on Surfaces

Author(s): Eugene Zhang, James Hays, Greg Turk.
Article: IEEE Transactions on Visualization and Computer Graphics, Vol. 13, No. 1, pp. 94--107, 2007.
[BibTeX] [DOI] Find this paper on Google

Designing tensor fields in the plane and on surfaces is a necessary task in many graphics applications, such as painterly rendering, pen-and-ink sketching of smooth surfaces, and anisotropic remeshing. In this article, we present an interactive design system that allows a user to create a wide variety of symmetric tensor fields over 3D surfaces either from scratch or by modifying a meaningful input tensor field such as the curvature tensor. Our system converts each user specification into a basis tensor field and combines them with the input field to make an initial tensor field. However, such a field often contains unwanted degenerate points which cannot always be eliminated due to topological constraints of the underlying surface. To reduce the artifacts caused by these degenerate points, our system allows the user to move a degenerate point or to cancel a pair of degenerate points that have opposite tensor indices. These operations provide control over the number and location of the degenerate points in the field. We observe that a tensor field can be locally converted into a vector field so that there is a one-to-one correspondence between the set of degenerate points in the tensor field and the set of singularities in the vector field. This conversion allows us to effectively perform degenerate point pair cancellation and movement by using similar operations for vector fields. In addition, we adapt the image-based flow visualization technique to tensor fields, therefore allowing interactive display of tensor fields on surfaces. We demonstrate the capabilities of our tensor field design system with painterly rendering, pen-and-ink sketching of surfaces, and anisotropic remeshing.

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