arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2306.00547cs.CVcs.GR

AvatarStudio:文本驱动的3D动态人类头部化身编辑

AvatarStudio: Text-driven Editing of 3D Dynamic Human Head Avatars

Max Planck Institute for Informatics(马克斯·普朗克信息学研究所);Saarland University(萨尔大学);MIT CSAIL(麻省理工学院计算机科学与人工智能实验室);University of Freiburg(弗赖堡大学)

Mohit Mendiratta, Xingang Pan, Mohamed Elgharib, Kartik Teotia, Mallikarjun B R, Ayush Tewari, Vladislav Golyanik, Adam Kortylewski, Christian Theobalt

AI总结:

本文提出AvatarStudio,结合个性化文本到图像扩散模型与VT-SDS,在NeRF表示中实现文本驱动的动态全头外观编辑,并通过形变网络保证3D与时间一致性。

摘要:

捕捉和编辑完整的头部表演能够创建虚拟角色,并在扩展现实和媒体制作等各种应用中发挥作用。过去几年,人类头部化身的照片真实感迅速提升。此类化身可以通过不同的输入数据模态进行控制,包括RGB、音频、深度、IMU等。尽管这些数据模态提供了有效的控制手段,但它们主要集中于编辑头部运动,例如面部表情、头部姿态和/或相机视角。本文提出了AvatarStudio,这是一种基于文本的方法,用于编辑动态全头化身的外观。我们的方法建立在现有工作之上,利用神经辐射场(NeRF)捕捉人类头部的动态表演,并使用文本到图像扩散模型编辑这一表示。具体而言,我们引入了一种优化策略,将表示视频表演中不同相机视角和时间戳的多个关键帧整合到单个扩散模型中。利用这一个性化扩散模型,我们遵循基于模型的引导方法,通过引入视角与时间感知的分数蒸馏采样(VT-SDS)来编辑动态NeRF。我们的方法在规范空间中编辑整个头部,然后通过预训练的形变网络将这些编辑传播到其余时间步。我们通过用户研究在视觉和数值上评估了该方法,结果表明我们的方法优于现有方法。实验验证了该方法的设计选择,并强调我们的编辑是真实、个性化的,同时具备3D一致性和时间一致性。

英文摘要:

Capturing and editing full head performances enables the creation of virtual characters with various applications such as extended reality and media production. The past few years witnessed a steep rise in the photorealism of human head avatars. Such avatars can be controlled through different input data modalities, including RGB, audio, depth, IMUs and others. While these data modalities provide effective means of control, they mostly focus on editing the head movements such as the facial expressions, head pose and/or camera viewpoint. In this paper, we propose AvatarStudio, a text-based method for editing the appearance of a dynamic full head avatar. Our approach builds on existing work to capture dynamic performances of human heads using neural radiance field (NeRF) and edits this representation with a text-to-image diffusion model. Specifically, we introduce an optimization strategy for incorporating multiple keyframes representing different camera viewpoints and time stamps of a video performance into a single diffusion model. Using this personalized diffusion model, we edit the dynamic NeRF by introducing view-and-time-aware Score Distillation Sampling (VT-SDS) following a model-based guidance approach. Our method edits the full head in a canonical space, and then propagates these edits to remaining time steps via a pretrained deformation network. We evaluate our method visually and numerically via a user study, and results show that our method outperforms existing approaches. Our experiments validate the design choices of our method and highlight that our edits are genuine, personalized, as well as 3D- and time-consistent.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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