Stippling Technique (1)

The stippling technique is one of art painting styles. This study was about the basic stippling technique which changes general images to artistic images with a lot of black dots. To express such stippling images in art, artists have to put a great amount of time and effort into drawing them. However, the stippling technique in Computer Graphics, especially NPR, can help people to make stippling images through computer system quickly and easily. There are two main technologies which are Voronoi Diagram and Weighted CVD (Central Voronoi Diagram). The former one is to make every dots have even space among them. The latter one is to express the light intensity of original images.

• Examples of Stippling Drawing Technique with Weighted CVD.

(All of them were rendered in 2003.)

Fig. 1. 'Face' with 4,000 dots and 20 iterations

Fig. 2. 'St. Maria' with 10,000 dots and 20 iterations

Fig. 3. 'Girls' with 15,000 dots and 20 iterations

• References

[1] O. Deussen, S. Hiller, K. van Overveld, and T. Strothotte. Floating points: A method for computing stipple drawings. Computer Graphics Forum, Eurographics 2000 Conference Proceedings, pp 40-51, April 2000.

[2] Q. Du, V. Faber, and M. Gunzburger. Centroidal voronoi tesselations. Siam Review, 41(4):637 676, June 1999.

[3] A. Secord. Weighted voronoi stippling., In 2nd International Symposion on Non-Realistic Animation and Rendering (NPAR), ACM Press , pp 37~43., 2002.