Unsupervised deep learning for optical flow computation has achieved
promising results. Most existing deep-net based methods rely on image
brightness consistency and local smoothness constraint to train the networks.
Their performance degrades at regions where repetitive textures or occlusions
occur. In this paper, we propose Deep Epipolar Flow, an unsupervised optical
flow method which incorporates global geometric constraints into network
learning. In particular, we investigate multiple ways of enforcing the epipolar
constraint in flow estimation. To alleviate a "chicken-and-egg" type of problem
encountered in dynamic scenes where multiple motions may be present, we propose
a low-rank constraint as well as a union-of-subspaces constraint for training.
Experimental results on various benchmarking datasets show that our method
achieves competitive performance compared with supervised methods and
outperforms state-of-the-art unsupervised deep-learning methods.

本文提出了一种基于全局几何约束的无监督深度学习光流方法 - Deep Epipolar Flow，并通过对多种强制使用对极约束的光流评估方式进行研究以及提出低秩约束和子空间并集约束来训练以缓解动态场景中存在多个运动时可能出现的 “鸡生蛋” 的问题。该方法在各种基准数据集上表现出卓越的性能，具有与监督方法相当的竞争性，并且优于最先进的无监督深度学习方法。