Modeling Scratchiness Effect of Oriental Writing Brush

Oriental ink writing consists of simple strokes intended to convey an artist's deep feelings that makes it to be regarded as a painting. Scratchiness in Japanese Kasure is one of the techniques which can express writer's emotion remarkably in calligraphy. A novel method to express Kasure focused on the change of the energy is proposed in this paper. An equation is designed to simulate oriental drawing. The ink in the brush permeates into a paper according to the equation which concerns the brush speed and volume of paper where the brush touches. Besides energy transmission equation, the droplets model is described in this paper to implement Kasure. The entire stroke area is assumed as the trail the droplets have swept. The hull of separated droplets elegantly expresses the scratchiness. We introduce the line form scratchiness segment as a basic unit for filling the between the droplets. The line shape components we propose is suited for expressing scratchiness. We present some examples of scratchiness as the results, and the emotion such as power and passion of the writer is expressed by proposed method.