[talks] C. Lu general exam

[Melissa M. Lawson]

Cynthia (Jingwan) Lu will present her research seminar/general exam on 
Thursday October 14 at 1PM in Room 402.  The members of her committee 
are:  Adam Finkelstein, advisor, Szymon Rusinkiewicz, and Bernard Chazelle.
Everyone is invited to attend her talk, and those faculty wishing to remain 
for the oral exam following are welcome to do so.  Her abstract and reading 
list follow below.
---------------------------

Abstract : Interactive Stylization of Moving Imagery with temporal coherence

Manually creating artwork is a creative but painstaking process. For applications like advertisement, games and video animation, there is an opportunity to use non-photorealistic rendering (NPR) techniques to alleviate the labor of creating  stylized imagery. In such applications, however, both interactivity and flexibility are crucial for supporting creative control. Moreover, for stylization of moving imagery an additional challenge lies in maintaining temporal coherence. Resulting animation and video sequences should be support continuity when applying stylization to avoid annoying artifacts such as flickering.

In this talk, I present two stylization systems that interact with the artists to generate imagery for different artistic styles. By providing input (still images, video or 3D models), painting sample textures and experimenting with system parameters, the artists can produce stylized and coherent rendering results immediately.

The first project focuses on painting surfaces in the scene with visible marks. We apply stroke-based techniques to emulate the layer-by-layer painting process. Temporal coherence is maintained by modeling strokes as independent moving particles guided by optical flow. We describe an algorithm that is executed entirely on GPU to produce high quality results at interactive rates.

The second project focuses on the generation of line drawings from 3D models. Important lines of the input are extracted and modeled as snakes - active contours tracking the visible boundaries in the scene. We stylize the active contours by fitting different types of curves, including straight line segments, cubic splines and clothoids. Additional stylization is introduced by adding small-scale synthesized offsets with respect to the brush path, and by varying the width of the brush strokes at different contour samples.

Papers:

1. KALNINS , R. D., MARKOSIAN , L., MEIER , B. J., KOWALSKI ,
M. A., LEE , J. C., DAVIDSON , P. L., WEBB , M., HUGHES ,
J. F., AND FINKELSTEIN , A. 2002. WYSIWYG NPR: drawing
strokes directly on 3D models. In Proceedings of SIGGRAPH
2002, 755–762.

2. KALNINS , R. D., DAVIDSON , P. L., MARKOSIAN , L., AND FINKELSTEIN , A. 2003.
Coherent stylized silhouettes. ACM Transactions on
Graphics 22, 3 (July), 856–861.

3. HAYS , J., AND ESSA , I. 2004. Image and video based painterly
animation. In Proceedings of NPAR 2004, 113–120.

4. VANDERHAEGHE , D., BARLA , P., THOLLOT, J., AND SILLION ,
F. 2007. Dynamic point distribution for stroke-based rendering.
In Rendering Techniques 2007 (Proceedings of the Eurographics
Symposium on Rendering), 139–146.

5. B OUSSEAU , A., NEYRET, F., THOLLOT, J., AND SALESIN ,
D. 2007. Video watercolorization using bidirectional texture
advection. In Proceedings of SIGGRAPH 2007, 104.

6. Aseem Agarwala, Aaron Hertzmann, David H. Salesin, and Steven M. Seitz.
Keyframe-
based tracking for rotoscoping and animation. In
SIGGRAPH '04: ACM SIGGRAPH 2004 Papers, pages 584-591, New York, NY, USA, 2004.
ACM

7. Aaron Hertzmann, "A Survey of Stroke-Based Rendering," IEEE Computer
Graphics and Applications, vol. 23, no. 4, pp. 70-81, July/Aug. 2003

8. Bénard, P., Bousseau, A., and Thollot, J. 2009. Dynamic solid textures for
real-time coherent stylization. In ACM SIGGRAPH Symposium on Interactive 3D
Graphics and Games, ACM, 121--127.

9. Aaron Hertzmann. Paint by relaxation. In
Computer Graphics International 2001, pages
47 54, July 2001.

10. L Lin, K Zeng, H Lv, Y Wang, Y Xu, SC Zhu. Painterly animation using video
semantics and feature correspondence. In Proceedings of NPAR 2010, 73-80.

Book:

Non-Photorealistic Rendering
Bruce Gooch, Amy Ashurst Gooch
Publisher: AK Peters, Ltd. (July 2001)
ISBN-10: 1568811330
ISBN-13: 978-1568811338