Coherent Line Drawing


Henry Kang      Seungyong Lee      Charles K. Chui





This paper presents a non-photorealistic rendering technique that automatically generates a line drawing from a photograph. We aim at extracting a set of coherent, smooth, and stylistic lines that effectively capture and convey important shapes in the image. We first develop a novel method for constructing a smooth direction field that preserves the flow of the salient image features. We then introduce the notion of flow-guided anisotropic filtering for detecting highly coherent lines while suppressing noise. Our method is simple and easy to implement. A variety of experimental results are presented to show the effectiveness of our method in producing self-contained, high-quality line illustrations.




Non-photorealistic rendering, Line drawing, Edge detection, Flow-based filtering




H. Kang, S. Lee, C. Chui. "Coherent Line Drawing". Proc. ACM Symposium on Non-photorealistic Animation and Rendering, pp. 43-50, San Diego, CA, August, 2007.


Paper in PDF (4MB)




author = "Henry Kang and Seungyong Lee and Charles K. Chui",
title = "Coherent Line Drawing",
booktitle = "ACM Symposium on Non-Photorealistic Animation and Rendering (NPAR)",
pages = {43-50},
month = aug,

year = "2007"