Expression of Lines Drawn by Chalks Based on Scanned Images

In this paper, we propose a computer graphics algorithm to represent lines drawn by chalk. Chalk lines have very coarse texture. We use a scanned image of textures drawn by real chalk. When two chalk lines cross to each other, we adopt alpha blending technique for obscuring part of the existing texture by a new texture. We obtained realistic chalk lines by a simple algorithm. The drawing process is not real time in our current implementation, but further improvement of the exciency can be expected.