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摘要：提出一种铅笔画模拟的方法。和传统的铅笔画步骤类似，经过轮廓提取和色调合
成，产生铅笔画模拟图像。轮廓提取通过L0 平滑后，用四向索贝尔算子提取边界，借助线积分
卷积实现色调合成。与现存方法不同的是，给出一种自适应噪声模型，根据源图像产生自适应
的噪声，将其作为线积分卷积的输入图像。实验证明提出的方法可以用来产生具有艺术效果的
铅笔画模拟图像。
Abstract: A method for pencil drawing simulation is proposed in this paper. As the conventional#br# procedure of pencil drawing, our method performs line drawing followed by tonal drawing. Line#br# drawing is implemented by L0 smoothing and four-directional Sobel gradient operators, while tonal#br# drawing is simulated by using of a line integral convolution method. Unlike the existing methods, an#br# adaptive noise model is given, which can be added to the source image replacing white noise as the#br# input to line integral convolution. The experimental results show that the proposed method can#br# closely imitate real pencil drawing with artistic effects.
