Pencil sketch generation with shape features
利用形体特征的铅笔素描画生成

Pencil sketching is an art, which represents objects by single color lines. The artists represent light and shading, while depicting shape features through observing the structure of the objects. In this paper, we present a non-photorealistic rendering technique that automatically generates a pencil sketch painting with shape features. We first use the bilateral filter to remove the noise. The vector field is calculated from the luminance image. We then develop a method for constructing a smooth vector field, which preserves shape features of the original image. Finally, line integral convolution and enhancing the contrast of light and shadow are used to generate the texture of pencil sketch. The experimental results show the effectiveness of this method in depicting an illusion of depth and producing the contrast of light and shadow.