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Expressive line drawings of human faces from range images

Science in China(Series F) 2009年第2期52卷 295-307页

作者： HUANG YueZhu MARTIN Ralph R. ROSIN Paul L. MENG XiangXu YANG ChengLei Department of Computer Science and Technology Shandong University Jinan 250101 China School of Computer Science Cardiff University Cardiff United Kingdom

We propose a novel technique to extract features from a range image and use them to produce a 3D pen-and-ink style portrait similar to a traditional artistic drawing. Unlike most previous template-based, component-based or example-based face sketching methods, which work from a frontal photograph as input, our system uses a range image as input. Our method runs in real-time for models of moderate complexity, allowing the pose and drawing style to be modified interactively. Portrait drawing in our system makes use of occluding contours and suggestive contours as the most important shape cues. However, current 3D feature line detection methods require a smooth mesh and cannot be reliably applied directly to noisy range images. We thus present an improved silhouette line detection algorithm. Feature edges related to the significant parts of a face are extracted from the range image, connected, and smoothed, allowing us to construct chains of line paths which can then be rendered as desired. We also incorporate various portrait-drawing principles to provide several simple yet effective non- photorealistic portrait renderers such as a pen-and-ink shader, a hatch shader and a sketch shader. These are able to generate various life-like impressions in different styles from a user-chosen viewpoint. To obtain satisfactory results, we refine rendered output by smoothing changes in line thickness and opacity. We are careful to provide appropriate visual cues to enhance the viewer＇s comprehension of the human face. Our experimental results demonstrate the robustness and effectiveness of our approach, and further suggest that our approach can be extended to other 3D geometric objects.

关键词： portrait drawing non-photorealistic rendering line drawing suggestive contour occluding contour feature line stylization

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Smooth Line Drawing on Graphics Hardware

Smooth Line Drawing on Graphics Hardware

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第七届中国计算机图形学大会

作者： Hanli Zhao1 , Xiaogang Jin1 , Jianbing Shen2 , Feifei Wei1 , Jieqing Feng1 1 (State Key lab of CAD & CG, Zhejiang University, Hangzhou 310058, China) 2(Indiana University-Purdue University Indianapolis, USA)

This paper presents a new object-space based algorithm for rendering a 3D model as a line drawing using graphics hardware, based on the insight that a line drawing can effectively convey shape using remarkably minimal visual content. suggestive contours, a new type of line can be combined with silhouettes to produce impressive view-dependent line drawing of smooth shapes. In addition, geometry shader, which is newly introduced into the Direct3D 10 pipeline, can process per-triangle primitive data and output zero or more line primitives. We propose a parallelized line drawing approach that directly extracts 3D sparse linear features in geometry shader. The method selects lines at an appropriate scale automatically, and exhibits good frame-to-frame coherence at interactive rates. The implementation of our algorithm is straightforward, and several experimental examples are given at the end of the paper to demonstrate the effectiveness of our approach.

关键词： Line drawing silhouette suggestive contour radial curvature graphics hardware.

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