We present a novel method for simultaneous learning of depth, egomotion, object motion, and camera intrinsics from monocular videos, using only consistency across neighboring video frames as supervision signal. Similarly to prior work, our method learns by applying differentiable warping to frames and comparing the result to adjacent ones, but it provides several improvements: We address occlusions geometrically and differentiably, directly using the depth maps as predicted during training. We introduce randomized layer normalization, a novel powerful regularizer, and we account for object motion relative to the scene. To the best of our knowledge, our work is the first to learn the camera intrinsic parameters, including lens distortion, from video in an unsupervised manner, thereby allowing us to extract accurate depth and motion from arbitrary videos of unknown origin at scale. We evaluate our results on the Cityscapes, KITTI and EuRoC datasets, establishing new state of the art on depth prediction and odometry, and demonstrate qualitatively that depth prediction can be learned from a collection of YouTube videos.

本研究提出了一种新的方法，使用相邻视频帧的一致性作为监督信号，同时从单目视频中学习深度预测、自运动、目标运动和相机内参数，并且首次实现对相机内参进行无监督学习，从而能够在任意未知来源的视频中提取准确的深度和运动信息。此方法在Cityscapes、KITTI和EuRoC数据集上验证了正确性，并取得了新的最佳性能。

自然场景视频中的深度估计：来自未知相机的无监督单目深度学习