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arXiv · 2110.02951

Video Autoencoder: self-supervised disentanglement of static 3D structure and motion

Zihang Lai·Sifei Liu·Alexei A. Efros·Xiaolong Wang
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Abstract

A video autoencoder is proposed for learning disentan- gled representations of 3D structure and camera pose from videos in a self-supervised manner. Relying on temporal continuity in videos, our work assumes that the 3D scene structure in nearby video frames remains static. Given a sequence of video frames as input, the video autoencoder extracts a disentangled representation of the scene includ- ing: (i) a temporally-consistent deep voxel feature to represent the 3D structure and (ii) a 3D trajectory of camera pose for each frame. These two representations will then be re-entangled for rendering the input video frames. This video autoencoder can be trained directly using a pixel reconstruction loss, without any ground truth 3D or camera pose annotations. The disentangled representation can be applied to a range of tasks, including novel view synthesis, camera pose estimation, and video generation by motion following. We evaluate our method on several large- scale natural video datasets, and show generalization results on out-of-domain images.

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Zihang Lai, Sifei Liu, Alexei A. Efros, Xiaolong Wang. 2021-10-06. Video Autoencoder: self-supervised disentanglement of static 3D structure and motion. https://arxiv.org/abs/2110.02951

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