Lowpoly

An Interactive System for Low-poly Illustration Generation from Images Using Adaptive Thinning

University of Science and Technology of China

IEEE International Conference on Multimedia and Expo 2017

AerialImage2BuildingMap

Figure 1: Algorithm overview. Given an input image (a), we first sample pixels and rank them according to their importance of preserving the image structure (b). We can see that the points on the edges are much more important. Then a Delaunay triangulation is constructed from the first K points according to user's selection (c). Finally, we render the color of each triangle to generate a low-poly illustration with a artistic looking.

Abstract:

Low-poly style illustrations, which have 3D abstract appearance, have become a popular stylish in non-photorealistic rendering in recent years. Most previous methods for creating low poly style illustrations require users to have special knowledge in 3D modeling and need laborious and tedious interactions. In this paper, we present an interactive system for no-expert users to easily manipulate the low-poly style illustration. Our system consists of two parts: vertex sampling and mesh rendering. In the vertex sampling stage, we firstly over-segment the input image and extract a set of candidate points from the superpixel corners, and rank them according to their importance of preserving the image structure using adaptive thinning. Based on the pre-ranked point list, the user can easily select an arbitrary number of vertexes for the triangle mesh construction. In the mesh rendering stage, we optimize the triangle colors for creating a higher contrast and stereo-looking low-poly illustration. We also provide users with three tools for flexible modification of vertex numbers, color contrast, and local region emphasis. The experiment results demonstrate that our system outperforms state-of-the-arts method via simple user interactions.

Results:

Figure 2: Compared to two methods, (a) results by [1] and (b) results by TRIGRAFF[2]. Since they don't report the vertex number, we provide two results automatically generated with different vertex number to approximate their results.

Figure 3: More reults generated using our system for a wide range of scenes.

Acknowledgements:

We thank the reviewers for their generous reviews that shaped the direction of the paper. This work was supported by the National Key Research & Development Plan of China under Grant No. 2016YFB1001402 and the National Natural Science Foundation of China under No. 61472377, 61632006, 61331017.

Main References:

[1] M.Gai and G.Wang : Artistic low poly rendering for images. The Visual Computer: International Journal of Computer Graphics(2016)

[2] Apple iTunes, TRIGRAFF, https://itunes.apple.com/cn/app/ art-camera-trigraff/id646603902.

BibTex:

@article{Ma_Lowpoly_icme2017,
author = {Yiting Ma, Xuejin Chen},
title = {An Interactive System for Low-poly Illustration Generation from Images Using Adaptive Thinning},
conference = {IEEE International Conference on Multimedia and Expo},
year = {2017}
}

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