Simulating oriental brush character considered with aerial action of pen tablet

The calligraphy is widely known in the oriental countries and has received art and high evaluation in history. The calligraphy is not only intended as a means of communication but also as a traditional culture that shows the artist using bristles and ink. The artwork is a cooperative process that involves the unique features of an ink painting device. The ink painting is expressed by diffusion, scratchiness and the light and shade. The purposes of this research are the simulation of oriental brush character considered with the aerial action of the pen tablet. Our system expresses the light and shade by changing the ink with the brush tip. In this system, the user attaches a light ink to the whole brush and touches a shading ink only on the tip of brushes. These characteristics are influenced by the pen pressure which is used to measure the ability of given pressure to the paper from a pen. The pen pressure is based to paper from the base of the pen, but the oriental brush pressure can be from the base of the oriental brush to the paper and from the tip of the oriental brush to paper. Consequently, the brush base pressure is the pen tablet pressure and the brush tip pressure is the aerial action of the pen tablet. The necessary information is obtained from pen tablets is XY-coordinate, pressure, direction, and altitude. In addition, the Z-coordinate is acquired using a web camera. Therefore, the distance from the tablet to the pen is measured. This distance is the Z coordinate which is the pressure at the tip of the brush. We express the light and shade by changing the pressure and Z-coordinate by using the droplet model. Additionally, the system reveals scratchiness and diffusion with an oriental brush that is affected by the amount of water and ink. As a result, users are able to write a calligraphy on the tablet with an oriental brush as a real brush and a feeling with a more delicate expression.