A major challenge in line drawing vectorization is segmenting the input bitmap into separate curves. This segmentation is especially problematic for rough sketches, where curves are depicted using multiple overdrawn strokes. Inspired by feature‐aligned mesh quadrangulation methods in geometry processing, we propose to extract vector curve networks by parametrizing the image with local drawing‐aligned integer grids. The regular structure of the grid facilitates the extraction of clean line junctions; due to the grid's discrete nature, nearby strokes are implicitly grouped together. We demonstrate that our method successfully vectorizes both clean and rough line drawings, whereas previous methods focused on only one of those drawing types.

中文翻译：

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整数网格草图简化和矢量化

线图矢量化的一个主要挑战是将输入位图分割成单独的曲线。这种分割对于粗略草图尤其成问题，其中曲线使用多个透支笔画来描绘。受几何处理中特征对齐的网格四边形方法的启发，我们建议通过使用局部绘图对齐的整数网格参数化图像来提取矢量曲线网络。网格的规则结构有利于提取干净的线结点；由于网格的离散性，附近的笔画被隐式地组合在一起。我们证明了我们的方法成功地矢量化了干净和粗糙的线条图，而以前的方法只关注其中一种绘图类型。