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.

Color Stippling Technique

This video represents my thesis for Master degree of Computer Graphics in 2005. Color Stippling Technique is kind of Non-Photorealistic Rendering Technique. This idea referred to pointillism of neo-impressionist artists, such as Georges Seurat. Through the Color Stippling technique, general photo images can be changed to artistic ones fast and easy. You can check this paper here.

The First Exhibition of the Basic Stippling Technique

This is the poster for my first exhibition in the 4th Annual Festival of The Graduate School of Advanced Imaging Science, Multimedia & FilM in Chung-Ang University (Seoul, South Korea), in 2003. This is the early study of the stippling technique in Non-Photorealistic Rendering (NPR). (I will explain what is stippling technique in this website soon.)

I showed the process of the stippling technique with sample images and provided the instant printing service at the exhibition as below.

• Test Example #1: Input (Left): Sport Shoes, Result (Right): 5000 dots, 5 iteration.

• Test Example #2: Input (Left): Face Sculpture, Result (Right): 3000 dots, 5 iteration.

• Printing Service Example: Input (Left): Visitor, Result (Right): 10000 dots, 5 iteration.

All the examples were made by a computer within several minutes.