We present an algorithm for reconstructing dense, geometrically consistent
depth for all pixels in a monocular video. We leverage a conventional
structure-from-motion reconstruction to establish geometric constraints on
pixels in the video. Unlike the ad-hoc priors in classical reconstruction, we
use a learning-based prior, i.e., a convolutional neural network trained for
single-image depth estimation. At test time, we fine-tune this network to
satisfy the geometric constraints of a particular input video, while retaining
its ability to synthesize plausible depth details in parts of the video that
are less constrained. We show through quantitative validation that our method
achieves higher accuracy and a higher degree of geometric consistency than
previous monocular reconstruction methods. Visually, our results appear more
stable. Our algorithm is able to handle challenging hand-held captured input
videos with a moderate degree of dynamic motion. The improved quality of the
reconstruction enables several applications, such as scene reconstruction and
advanced video-based visual effects.

通过利用传统的运动结构恢复来建立视频中像素的几何约束，使用基于学习的先验 —— 一种单图像深度估计的卷积神经网络，我们给出了一种用于重建密集、几何一致深度的算法。测试时，我们对这个网络进行微调，以满足特定输入视频的几何约束，同时保留其在视频中的其他区域中合成可信深度细节的能力。通过定量验证，我们证明了我们的方法比以前的单目重建方法有更高的准确性和更高的几何一致性。我们的算法能够处理具有轻度动态运动的挑战性手持捕获输入视频。改进重建的质量可以用于场景重建和高级视频视觉效果。