Optical Flow Domain Adaptation via Target Style Transfer

Jeongbeen Yoon, Sanghyun Kim, Suha Kwak, Minsu Cho; Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (WACV), 2024, pp. 2111-2121

Optical flows play an integral role for a variety of motion-related tasks such as action recognition, object segmentation, and tracking in videos. While state-of-the-art optical flow methods heavily rely on learning, the learned optical flow methods significantly degrade when applied to different domains, and the training datasets are very limited due to the extreme cost of flow-level annotation. To tackle the issue, we introduce a domain adaptation technique for optical flow estimation. Our method extracts diverse style statistics of the target domain and use them in training to generate synthetic features from the source features, which contain the contents of the source but the style of the target. We also impose motion consistency between the synthetic target and the source and deploy adversarial learning at the flow prediction to encourage domain-invariant features. Experimental results show that the proposed method achieves substantial and consistent improvements in different domain adaptation scenarios on VKITTI 2, Sintel, and KITTI 2015 benchmarks.