Abstract: This paper proposes a method for pencil sketching from images.The carve vector field is calculated from the gradient field of source’s luminance image，and the structure vector field is extracted.Variable LIC convolution step-number and texture directions are produced according to the local characteristics of the structured vector field and the image which is segmented separately.Then Line-Integral Convolution（LIC） method is applied to form natural and smooth rendering results.It synthesizes the result of LIC and the edge details which apply neon processing.Experimental results show that this method can create a pencil sketching of the artistic style according to the number of the image detail，and it is fast.

Key words: non-photo-realistic rendering, pencil sketching style, line integral convolution, structure vector field

摘要： 提出一种非真实感铅笔画的绘制方法，通过对图像的亮度分量计算切矢量场，获得图像的结构矢量场。根据矢量场和图像分割后的局部特征产生可变的积分步数和纹理走势。利用线积分卷积方法，自适应地处理图像。将绘制结果和通过霓虹处理得到的轮廓效果相结合。实验结果表明，该方法能够根据图像的细节丰富情况模拟铅笔画的艺术风格，并且生成速度较快。

关键词: 非真实感绘制, 铅笔画风格, 线积分卷积, 结构矢量场