中文摘要：

与真实感绘制技术关注于传统的3D图形学不同，非真实感绘制技术更加强调艺术表现力、主观意识与情绪的传递以及强化重要信息、忽略非关键信息等方面．提出了一种自动的、基于流体模拟的方法来生成具有凡高后期风格的油画图像．提出以流体线条参考图颜色梯度的法线方向作为画笔方向，对原图进行多层绘制；同时，提出一种改进的多光源局部光照模型，以有效地反映不同光照条件下艺术图像的不同表征力．另外，设计了一种在光照条件下模拟画笔物理特征的方法，该方法通过bump—mapping增强绘制图像的涂料层叠感．为了使生成的绘制图像具有凡高油画的色彩风格，采用了一种颜色转换方法，将特定的艺术原画色彩特征转换到绘制图像上．实验结果表明，对于给定的输入图像，该算法能够有效地生成具有凡高后期艺术风格的油画．

英文摘要：

Unlike photorealistic rendering striven by traditional 3D computer graphics, NPR emphasizes artistic expression, subjective mood imbuing, and downplaying unimportant information. The paper presents a new automatic method for generating oil paintings via fluid simulation technology. A paintly rendering is built up in a series of layers, drawn with large, long and curved brush strokes, and aligned to normal of fluid reference image gradients. In this method, an improved reflectance model with multiple light sources is proposed, which can represent the variability of lighting conditions on artistic painting. Additionally, a technique for simulating the hierarchical physical appearance of oil paintings under lighting is designed. The painting is rendered by bump-mapping the painting＇s colors with the image＇s intensity map. Finally, color transfer technique is adopted to make the color characteristic of the generated image consistent with that of some specified artistic source images. Experimental results show that the proposed method can be used efficiently to create oil paintings similar to some Van Gogh＇s style from a photograph.