Photorealistic rendering and reposing of humans is important for enabling
augmented reality experiences. We propose a novel framework to reconstruct the
human and the scene that can be rendered with novel human poses and views from
just a single in-the-wild video. Given a video captured by a moving camera, we
train two NeRF models: a human NeRF model and a scene NeRF model. To train
these models, we rely on existing methods to estimate the rough geometry of the
human and the scene. Those rough geometry estimates allow us to create a
warping field from the observation space to the canonical pose-independent
space, where we train the human model in. Our method is able to learn subject
specific details, including cloth wrinkles and accessories, from just a 10
seconds video clip, and to provide high quality renderings of the human under
novel poses, from novel views, together with the background.

本文提出了一个新的框架，用于从野外视频中重建人体和场景，并在单个视频上提供新的人体姿势和视角渲染的方法。通过训练两个 NeRF 模型（human 和 scene），并依赖现有方法估计人体和场景的大致几何形状，可以从观察空间创建到无关姿态的规范空间的偏移场，进而在规范空间中训练人体模型。我们的方法能够从仅 10 秒的视频剪辑中学习特定主题的细节，包括服装褶皱和配件，并提供在新视角和新姿势下人体的高质量渲染和背景。