Self-similar texture for coherent line stylization

Bénard, Pierre; Cole, Forrester; Golovinskiy, Aleksey; Finkelstein, Adam

doi:10.1145/1809939.1809950

Cited by 30 publications

(38 citation statements)

References 20 publications

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“…Existing methods for temporally-coherent line drawing [Kalnins et al 2003;Bénard et al 2010;Bénard et al 2012] are not directly applicable as they do not ensure the stereo coherence between binocular views when moving from one frame to the next. Considering that our epipolar-slidability handles coherence of viewdependent lines across binocular views, one might be able to extend this concept to time domain across arbitrary view changes.…”

Section: Discussion and Future Workmentioning

confidence: 99%

“…There are a variety of rendering techniques for drawing lines extracted from 3D shapes, focusing on stylization [Northrup and Markosian 2000;Kalnins et al 2002], visibility test , and temporal coherence [Kalnins et al 2003;Bénard et al 2010;Bénard et al 2012]. In this paper, we build on existing stylization methods to provide stereo coherence for stylized lines between two views.…”

Section: Related Workmentioning

confidence: 99%

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Stereoscopic 3D line drawing

2013

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Figure 1: Stereo line drawing. (a) each-eye-based lines, (b) our lines, (c) each-eye-based stylization, (d) our stylization, (e) our result combined with toon shading. Binocular rivalry occurs in several regions (e.g., wrinkles) in (a) and (c), whereas our method eliminates such artifacts in (b) and (d) by using stereo-coherent lines and stylization. Stereo images in this paper can be viewed using red/cyan 3D glasses. AbstractThis paper discusses stereoscopic 3D imaging based on line drawing of 3D shapes. We describe the major issues and challenges in generating stereoscopic 3D effects using lines only, with a couple of relatively simple approaches called each-eye-based and centereye-based. Each of these methods has its shortcomings, such as binocular rivalry and inaccurate lines. We explain why and how these problems occur, then describe the concept of stereo-coherent lines and an algorithm to extract them from 3D shapes. We also propose a simple method to stylize stereo lines that ensures the stereo coherence of stroke textures across binocular views. The proposed method provides viewers with unique visual experience of watching 2D drawings popping out of the screen like 3D.

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Section: Discussion and Future Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Stereoscopic 3D line drawing

2013

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“…[7] is very appropriate when zooming in or out by a significant factor, and for parallel nearby lines. It works by precomputing self-similarity and smoothly varying line maps to paramet erize adjacent feature lines.…”

Section: Related Workmentioning

confidence: 99%

“…Several researchers have addressed the problem of temporal continuity for stylized line drawing animations [5][6][7][8][9]. They pay particular attention to tracing the lines in order to obtain coherent parameterization for stylization.…”

Section: Introductionmentioning

confidence: 99%

Stylized strokes for coherent line drawings

2015

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Temporal coherence is one of the central challenges for rendering a stylized line. It is especially difficult for stylized contours of coarse meshes or nonuniformly sampled models, because those contours are polygonal feature edges on the models with no continuous correspondences between frames. We describe a novel and simple technique for constructing a 2D brush path along a 3D contour. We also introduce a 3D parameter propagation and re-parameterization procedure to construct stroke paths along the 2D brush path to draw coherently stylized feature lines with a wide range of styles. Our method runs in real-time for coarse or non-uniformly sampled models, making it suitable for interactive applications needing temporal coherence.

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“…Bénard et al [2010] address this issue by generating a multi-scale texture. The proposed parameterization focuses on the same real-time scenario as Kalnins et al [2003] and shares the same limitations inherent in this setup.…”

Section: Related Workmentioning

confidence: 99%

Spatio-temporal analysis for parameterizing animated lines

Buchholz

Faraj

Paris

et al. 2011

Proceedings of the ACM SIGGRAPH/Eurographics Symposium on Non-Photorealistic Animation and Rendering

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Figure 1: Our algorithm builds a temporally consistent parameterization for lines extracted from an animated 3D scene. AbstractWe describe a method to parameterize lines generated from animated 3D models in the context of animated line drawings. Cartoons and mechanical illustrations are popular subjects of nonphotorealistic drawings and are often generated from 3D models. Adding texture to the lines, for instance to depict brush strokes or dashed lines, enables greater expressiveness, e.g. to distinguish between visible and hidden lines. However, dynamic visibility events and the evolving shape of the lines raise issues that have been only partially explored so far. In this paper, we assume that the entire 3D animation is known ahead of time, as is typically the case for feature animations and off-line rendering. At the core of our method is a geometric formulation of the problem as a parameterization of the space-time surface swept by a 2D line during the animation. First, we build this surface by extracting lines in each frame. We demonstrate our approach with silhouette lines. Then, we locate visibility events that would create discontinuities and propagate them through time. They decompose the surface into charts with a disc topology. We parameterize each chart via a least-squares approach that reflects the specific requirements of line drawing. This step results in a texture atlas of the space-time surface which defines the parameterization for each line. We show that by adjusting a few weights in the least-squares energy, the artist can obtain an artifact-free animated motion in a variety of typical non-photorealistic styles such as painterly strokes and technical line drawing.

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Self-similar texture for coherent line stylization

Cited by 30 publications

References 20 publications

Stereoscopic 3D line drawing

Stereoscopic 3D line drawing

Stylized strokes for coherent line drawings

Spatio-temporal analysis for parameterizing animated lines

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