Zihang Lai, Erika Lu, Weidi Xie
Visual Geometry Group, Department of Engineering Science, University of Oxford
CVPR 2020
DAVIS-2017 Video Segmentation
Youtube-VOS 2018 Video Segmentation
Recent interest in self-supervised dense tracking has yielded rapid progress, but performance still remains far from supervised methods. We propose a dense tracking model trained on videos without any annotations that surpasses previous self-supervised methods on existing benchmarks by a significant margin (+15%), and achieves performance comparable to supervised methods. In this paper, we first reassess the traditional choices used for self-supervised training and reconstruction loss by conducting thorough experiments that finally elucidate the optimal choices. Second, we further improve on existing methods by augmenting our architecture with a crucial memory component. Third, we benchmark on large-scale semi-supervised video object segmentation(aka. dense tracking), and propose a new metric: generalizability. Our first two contributions yield a self-supervised network that for the first time is competitive with supervised methods on standard evaluation metrics of dense tracking. When measuring generalizability, we show self-supervised approaches are actually superior to the majority of supervised methods. We believe this new generalizability metric can better capture the real-world use-cases for dense tracking, and will spur new interest in this research direction.
@inproceedings{Lai20, title={MAST: A Memory-Augmented Self-supervised Tracker}, author={Lai, Zihang and Lu, Erika and Xie, Weidi}, booktitle={CVPR}, year={2020} }
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Video segmentation results on Youtube-VOS 2018 dataset.
Video segmentation results on DAVIS-2017 dataset. Higher values are better.