Automatic coloring to freehand line drawings in online
Automatic coloring to freehand line drawings in online
复制标题
在线手绘线图自动着色
DOI：
10.1117/12.2075415
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Kenji Shoji
中科院分区：
文献类型：
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作者：
Saori Kurata,Fubito Toyama;Hiroshi Mori;Kenji Shoji
对于在 PC 屏幕上绘制的手绘线条图像，其中用户选择的参考图像（例如彩色照片）作为模型以低对比度微弱显示，我们提出了一种使用约束 Delaunay 三角剖分自动着色的方法，该方法将图像划分为小三角形。使用基于所提出方法的原型系统，用户只需绘制线条即可完成令人印象深刻的图片。我们的着色方法首先对绘制线上的采样点集进行三角测量，然后对参考图像上每个三角形的颜色进行采样，对相邻三角形之间的颜色进行平滑，并使用平滑后的颜色绘制每个三角形。修改三角测量的结果，使其满足这样的约束：其分割线不应与绘制的线交叉，也不应混合超出绘制的线的颜色。我们的原型系统可以立即显示当前图纸的着色结果，方便使用。这样，用户可以随时查看新绘制的线条的着色效果。由于着色的结果取决于用户如何徒手绘制线条，因此可以将其视为具有每个用户的绘画个性的艺术作品。
For a freehand line image drawn onto a PC screen where a user-selected reference image, e.g., a color photograph, as a model is faintly displayed with low contrast, we proposed a method for automatic coloring with a constrained Delaunay triangulation that divides the image into small triangles. Using a prototype system based on the proposed method, users can complete impressive pictures by only drawing lines. Our coloring method begins with the triangulation for the set of sampling points on the drawn lines, followed by sampling of color in each triangle on the reference image, smoothing of color among neighboring triangles, and painting of each triangle with the smoothed color. The result of the triangulation is modified such that it satisfies a constraint where its divided lines should not cross over the drawn lines not to mix colors beyond the drawn line. Our prototype system can display the coloring result of the current drawings immediately for convenience. So, the user can check the effect of a newly drawn line on coloring at any time. As the result of the coloring depends on how the user draws freehand lines, it can be seen as an art work with the individuality of each user’s drawings.