GAMES Webinar 2017-27期（Siggraph Asia 2017论文报告）| 李天野（美国南加州大学），胡力文（美国南加州大学）
【GAMES Webinar 2017-27期（Siggraph Asia 2017论文报告）】
报告时间：2017年12月21日（星期四）晚20:00 – 20:45（北京时间）
报告题目：Learning A Model of Facial Shape and Expression from 4D Scans
The field of 3D face modeling has a large gap between high-end and low-end methods. At the high end, the best facial animation is indistinguishable from real humans, but this comes at the cost of extensive manual labor. At the low end, face capture from consumer depth sensors relies on 3D face models that are not expressive enough to capture the variability in natural facial shape and expression. We seek a middle ground by learning a facial model from thousands of accurately aligned 3D scans. Our FLAME model (Faces Learned with an Articulated Model and Expressions) is designed to work with existing graphics software and be easy to fit to data. FLAME uses a linear shape space trained from 3800 scans of human heads. FLAME combines this linear shape space with an articulated jaw, neck, and eyeballs, pose-dependent corrective blendshapes, and additional global expression from 4D face sequences in the D3DFACS dataset along with additional 4D sequences.We accurately register a template mesh to the scan sequences and make the D3DFACS registrations available for research purposes. In total the model is trained from over 33, 000 scans. FLAME is low-dimensional but more expressive than the FaceWarehouse model and the Basel Face Model. We compare FLAME to these models by fitting them to static 3D scans and 4D sequences using the same optimization method. FLAME is significantly more accurate and is available for research purposes (http://flame.is.tue.mpg.de).
Tianye Li is a PhD student at University of Southern California (USC), advised by Prof. Hao Li. During his PhD study, he interned at Max Planck Institute for Intelligent Systems (Tübingen, Germany). Previously, he obtained a Master’s degree in Electrical Engineering from USC and a Bachelor’s degree in Electronic and Information Engineering from Xidian University, Xi’an, China. His research interests include computer vision and computer graphics, especially performance capture, modeling and understanding for human face and body. 讲者个人主页：https://sites.google.com/site/tianyefocus/home
报告时间：2017年12月21日（星期四）晚20:45 – 21:30（北京时间）
报告题目：Avatar Digitization from A Single Image for Real-time Rendering
We present a fully automatic framework that digitizes a complete 3D head with hair from a single unconstrained image. Our system offers a practical and consumer-friendly end-to-end solution for avatar personalization in gaming and social VR applications. The reconstructed models include secondary components (eyes, teeth, tongue, and gums) and provide animation-friendly blendshapes and joint-based rigs. While the generated face is a high-quality textured mesh, we propose a versatile and efficient polygonal strips (polystrips) representation for the hair. Polystrips are suitable for an extremely wide range of hairstyles and textures and are compatible with existing game engines for real-time rendering. In addition to integrating state-of-the-art advances in facial shape modeling and appearance inference, we propose a novel single-view hair generation pipeline, based on 3D-model and texture retrieval, shape refinement, and polystrip patching optimization. The performance of our hairstyle retrieval is enhanced using a deep convolutional neural network for semantic hair attribute classification. Our generated models are visually comparable to state-of-the-art game characters designed by professional artists. For real-time settings, we demonstrate the flexibility of polystrips in handling hairstyle variations, as opposed to conventional strand-based representations. We further show the effectiveness of our approach on a large number of images taken in the wild, and how compelling avatars can be easily created by anyone.
Hu is currently a fourth year Ph.D. student in the Department of Computer Science at University of Southern California. His advisor is Prof. Hao Li. Before that, he obtained his M.S. degree from University of Southern California in 2014 and B.S. degree from Zhejiang University in 2012. Hu works in the field of Computer Graphics. His research focuses on developing new data-driven techniques and modeling tools for the digitization of highly intricate geometric structures such as human hair as well as the acquisition of physical properties from captured data. 讲者个人主页：http://www-scf.usc.edu/~liwenhu/
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