Journal for Geometry and Graphics 11 (2007), No. 1, 105--110
Copyright Heldermann Verlag 2007
Expression of Lines Drawn by Chalks Based on Scanned Images
Fumihiro Okabe
Faculty of Science and Technology, Keio University, Kohoku-ku, Yokohama 223-8522, Japan
Koji Nakamaru
Faculty of Science and Technology, Keio University, Kohoku-ku, Yokohama 223-8522, Japan
Yoshio Ohno
Faculty of Science and Technology, Keio University, Kohoku-ku, Yokohama 223-8522, Japan
ohno@on.ics.keio.ac.jp
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 efficiency can be expected.
Keywords: Non-photorealistic rendering, chalk line, cubic Bezier curve, alpha blending.
MSC: 68U05
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