HQ3DAvatar:高质量隐式 3D 头像

IF 7.8 1区 计算机科学 Q1 COMPUTER SCIENCE, SOFTWARE ENGINEERING
Kartik Teotia, Mallikarjun B R, Xingang Pan, Hyeongwoo Kim, Pablo Garrido, Mohamed Elgharib, Christian Theobalt
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引用次数: 0

摘要

最近,多视角体积渲染技术在建模和合成高质量头部虚拟形象方面显示出巨大潜力。捕捉完整头部动态表现的常见方法是使用基于网格的模板或基于三维立方体的图形基元来跟踪底层几何体。虽然这些基于模型的方法取得了可喜的成果,但它们往往无法学习复杂的几何细节,如嘴巴内部、头发和随时间发生的拓扑变化。本文介绍了一种构建高度逼真的数字头像的新方法。我们的方法通过神经网络参数化的隐式函数来学习典型空间。它利用所学特征空间中的多分辨率哈希编码,实现了高质量、更快的训练和高分辨率渲染。测试时,我们的方法由单目 RGB 视频驱动。在这里,图像编码器会提取特定的面部特征,这些特征也是可学习的典型空间的条件。这样就能在训练过程中鼓励随形变而变化的纹理。我们还提出了一种新颖的基于光流的损耗,它能确保所学典型空间中的对应关系,从而促进无伪影和时间一致的渲染。我们展示了具有挑战性的面部表情结果,并以交互式实时速率展示了分辨率为 480x270 的自由视点渲染。我们的方法在视觉和数值上都优于相关方法。我们将发布我们的多重身份数据集,以鼓励进一步的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
HQ3DAvatar: High Quality Implicit 3D Head Avatar

Multi-view volumetric rendering techniques have recently shown great potential in modeling and synthesizing high-quality head avatars. A common approach to capture full head dynamic performances is to track the underlying geometry using a mesh-based template or 3D cube-based graphics primitives. While these model-based approaches achieve promising results, they often fail to learn complex geometric details such as the mouth interior, hair, and topological changes over time. This paper presents a novel approach to building highly photorealistic digital head avatars. Our method learns a canonical space via an implicit function parameterized by a neural network. It leverages multiresolution hash encoding in the learned feature space, allowing for high-quality, faster training and high-resolution rendering. At test time, our method is driven by a monocular RGB video. Here, an image encoder extracts face-specific features that also condition the learnable canonical space. This encourages deformation-dependent texture variations during training. We also propose a novel optical flow based loss that ensures correspondences in the learned canonical space, thus encouraging artifact-free and temporally consistent renderings. We show results on challenging facial expressions and show free-viewpoint renderings at interactive real-time rates for a resolution of 480x270. Our method outperforms related approaches both visually and numerically. We will release our multiple-identity dataset to encourage further research.

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来源期刊
ACM Transactions on Graphics
ACM Transactions on Graphics 工程技术-计算机:软件工程
CiteScore
14.30
自引率
25.80%
发文量
193
审稿时长
12 months
期刊介绍: ACM Transactions on Graphics (TOG) is a peer-reviewed scientific journal that aims to disseminate the latest findings of note in the field of computer graphics. It has been published since 1982 by the Association for Computing Machinery. Starting in 2003, all papers accepted for presentation at the annual SIGGRAPH conference are printed in a special summer issue of the journal.
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