@article{liu2021asflow, title={Asflow: Unsupervised optical flow learning with adaptive pyramid sampling}, author={Liu, Shuaicheng and Luo, Kunming and Luo, Ao and Wang, Chuan and Meng, Fanman and Zeng, Bing}, journal={IEEE Transactions on Circuits and Systems for Video Technology}, volume={32}, number={7}, pages={4282–4295}, year={2021}, publisher={IEEE} }