# PRESSURE BASED INK DIFFUSION MODEL FOR REAL-TIME SIMULATION OF CHINESE CALLIGRAPHY

### Ye Wang, Jon Rokne

#### 2007

#### Abstract

This paper describes a novel approach to simulating Chinese calligraphy for digital image purposes. The approach includes an ink diffusion model, a multi-layer paper model, a brush model, and the simulation of special effects. Special attention is given to the ink diffusion effect which is of importance in Chinese calligraphy. When the ink is deposited onto absorbent paper, it spreads outside the original border of a stroke since the flow of water will transport carbon particles along the capillary tubes found in the paper. The ink flow model is based on a new algorithm simulating dynamic ink diffusion into absorbent paper. In this capillary network based paper model, the pressure at each node can be obtained from Darcy’s law applied to the ink used in the calligraphy on each edge and it is proportional to the density of capillaries. The deposition layer of the paper is furthermore used to simulate the deposition of carbon particles into the paper and it is also used to simulate the washing out effects. Ink effects such as irregular edges and back run effect can also be simulated. The system is efficient and can create realistic Chinese calligraphy in real-time.

#### References

- Chu, N. S.-H. and Tai, C.-L. (2005). MoXi: Real-Time Ink Dispersion in Absorbent Paper. SIGGRAPH 2005, 24(3):504-511.
- Curtis, C. J., Anderson, S. E., Seims, J. E., Fleischer, K. W., and Salesin, D. H. (1997). Computer-Generated Watercolor. In Whitted, T., editor, SIGGRAPH97, CGPACS, pages 421-430, New York.
- Guo, Q. and Kunii, T. L. (1991). Modeling the diffuse painting of sumie. IFIP Modeling in Computer Graphics, pages 329-338.
- Huang, S., Way, D., and Shih, Z. C. (2003). Physical-Based Model of Ink Diffusion in Chinese Ink Paintings. In Proceedings of WSCG 2003, volume 10, pages 520- 527.
- Kunii, T. L., Nosovskij, G. V., and Hayashi, T. (1995). A diffusion model for computer animation of diffuse ink painting. pages 98-102, Geneva, Switzerland.
- Lee, J. (2001). Diffusion Rendering of Black Ink Paintings Using New Paper and Ink Models. j-CAG, 25(2):295- 308.
- Strassmann, S. (1986). Hairy brush. Proc. of SIGGRAPH 7886, pages 225-232.
- Succi, S. (2001). Lattice Boltzmann equation for fluid dynamics and beyond. Oxford University Press.
- T. V. Laerhoven, J.Liesenborgs, F. R. (2004). Real-time watercolor painting on a distributed paper model. pages 640-643, Crete, Greece.
- Tsai, C., Liaw, C., Huang, C., and Lee, J. (2005). Synthesizing the artistic effects of ink painting. Optical engineering, pages 359-368.
- Xiaofeng Mi, Min Tang, J. D. (2004). Droplet: A virtual brush model to simulate chinese calligraphy and painting. Journal of Computer Science and Technology, 19(3):393-404.
- Yu, Y. J., Lee, D. H., Lee, Y. B., and Cho, H. G. (2003). Interactive Rendering Technique for Realistic Oriental Painting. Journal of WSCG, 11:538-545.

#### Paper Citation

#### in Harvard Style

Wang Y. and Rokne J. (2007). **PRESSURE BASED INK DIFFUSION MODEL FOR REAL-TIME SIMULATION OF CHINESE CALLIGRAPHY** . In *Proceedings of the Second International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,* ISBN 978-972-8865-71-9, pages 271-276. DOI: 10.5220/0002071902710276

#### in Bibtex Style

@conference{grapp07,

author={Ye Wang and Jon Rokne},

title={PRESSURE BASED INK DIFFUSION MODEL FOR REAL-TIME SIMULATION OF CHINESE CALLIGRAPHY},

booktitle={Proceedings of the Second International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,},

year={2007},

pages={271-276},

publisher={SciTePress},

organization={INSTICC},

doi={10.5220/0002071902710276},

isbn={978-972-8865-71-9},

}

#### in EndNote Style

TY - CONF

JO - Proceedings of the Second International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP,

TI - PRESSURE BASED INK DIFFUSION MODEL FOR REAL-TIME SIMULATION OF CHINESE CALLIGRAPHY

SN - 978-972-8865-71-9

AU - Wang Y.

AU - Rokne J.

PY - 2007

SP - 271

EP - 276

DO - 10.5220/0002071902710276