敦煌壁画的铅笔画渲染研究

发布时间：2018-06-06 02:41

本文选题：非真实感渲染 + 敦煌壁画　；参考：《西北民族大学》2017年硕士论文

【摘要】：本文的主旨在于实现敦煌壁画的铅笔画渲染,进一步提升敦煌壁画的艺术、宗教、社会价值,保护和传承敦煌壁画。主要研究工作如下:1)敦煌壁画的平滑预处理。本文提出使用LO平滑技术平滑敦煌壁,该方法可以降低壁画的粗糙感,还可以在一定程度修复敦煌壁画。本文经过对比实验证明了 LO平滑方法的优越性,该方法可以在平滑图像的同时保留边界信息,是一种非常适合敦煌壁画的平滑方法。2)敦煌壁画的边界提取。对敦煌壁画进行平滑处理后,使用改进的Roberts算子提取图像边界。经过平滑处理后壁画中的噪声被平滑掉了,所以选择定位精度高但对噪声敏感的Roberts算子。与其他边界提取算子相比Roberts算子运算耗时最短、边界提取结果最好。3)提出了不进行色调调整的铅笔画渲染方法。敦煌壁画作为一种古代画家传承至今的手绘艺术作品,其色调分布、明暗变化都有其独特的艺术价值。对敦煌壁画进行色调调整必然会破坏其艺术价值。针对敦煌壁画与普通图像之间的巨大差异,本文在渲染过程中并没有对敦煌壁画进行色调调整。4)使用基于真实纹理的渲染方法进行纹理渲染。现阶段主流的LIC方法耗时耗力。而基于真实纹理的渲染方法只需选取适当的铅笔画纹理就可以快速地实现敦煌壁画的纹理渲染。5)彩色铅笔画渲染的实现。通过RGB空间与YUV空间之间的相互转换获取彩色铅笔画渲染结果。实验证明,通过本文算法实现了对敦煌壁画的铅笔画渲染。渲染结果中壁画粗糙、破损的部分得到了修复,壁画的视觉效果得到了明显提升。虽然壁画变成了铅笔画形式,添加了铅笔画纹理,但是其色调分布,明暗变化等并没有发生改变,其艺术价值得到了充分保留。
[Abstract]:The main purpose of this paper is to realize the pencil-painting rendering of Dunhuang murals, to further enhance the art, religion, social value of Dunhuang murals, and to protect and inherit Dunhuang murals. The main research work is as follows: (1) smooth pretreatment of Dunhuang murals. In this paper, the Lo smoothing technique is proposed to smooth the Dunhuang wall, which can reduce the roughness of the murals and repair the Dunhuang murals to a certain extent. This paper proves the superiority of Lo smoothing method, which can keep the boundary information while smoothing the image. It is a very suitable smoothing method for Dunhuang murals. 2) the boundary extraction of Dunhuang murals. After smoothing the Dunhuang murals, the improved Roberts operator is used to extract the image boundary. After smoothing, the noise in the murals is smoothed out, so the Roberts operator with high accuracy and sensitivity to noise is chosen. Compared with other edge extraction operators Roberts operator has the shortest computation time and the best edge extraction result. 3) A pencil-drawing rendering method without hue adjustment is proposed. Dunhuang murals, as a hand-painted work inherited by ancient painters, have their unique artistic value. Color adjustment of Dunhuang murals will inevitably destroy its artistic value. In view of the huge difference between Dunhuang murals and ordinary images, this paper does not adjust the color of Dunhuang murals in the process of rendering. 4) texture rendering method based on real texture is used. The current mainstream LIC method is time-consuming and labor-intensive. However, the rendering method based on real texture can quickly realize the texture rendering of Dunhuang murals. 5) Color pencil painting rendering can be realized by selecting the appropriate pencil-drawing texture. The color pencil-drawing rendering results are obtained by the conversion between RGB space and YUV space. Experimental results show that the paper realizes the pencil-drawing rendering of Dunhuang murals. In the rendering results, the murals are rough, damaged parts have been repaired, and the visual effects of the murals have been significantly improved. Although the mural has changed into the form of pencil-drawing and has added the pencil-drawing texture, its color distribution, light and shade have not changed, and its artistic value has been fully preserved.
【学位授予单位】：西北民族大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：K879.41;TP391.41

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