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- W3128626728 abstract "Temporal action proposal generation is an important and challenging task in video understanding, which aims at detecting all temporal segments containing action in-stances of interest. The existing proposal generation approaches are generally based on pre-defined anchor windows or heuristic bottom-up boundary matching strategies. This paper presents a simple and efficient framework (RTD-Net) for direct action proposal generation, by re-purposing a Transformer-alike architecture. To tackle the essential visual difference between time and space, we make three important improvements over the original transformer detection framework (DETR). First, to deal with slowness prior in videos, we replace the original Transformer en-coder with a boundary attentive module to better capture long-range temporal information. Second, due to the ambiguous temporal boundary and relatively sparse annotations, we present a relaxed matching scheme to relieve the strict criteria of single assignment to each groundtruth. Finally, we devise a three-branch head to further improve the proposal confidence estimation by explicitly predicting its completeness. Extensive experiments on THUMOS14 and ActivityNet-1.3 benchmarks demonstrate the effectiveness of RTD-Net, on both tasks of temporal action proposal generation and temporal action detection. Moreover, due to its simplicity in design, our framework is more efficient than previous proposal generation methods, without non-maximum suppression post-processing. The code and models are made available at https://github.com/MCG-NJU/RTD-Action." @default.
- W3128626728 created "2021-02-15" @default.
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- W3128626728 date "2021-10-01" @default.
- W3128626728 modified "2023-10-12" @default.
- W3128626728 title "Relaxed Transformer Decoders for Direct Action Proposal Generation" @default.
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- W3128626728 doi "https://doi.org/10.1109/iccv48922.2021.01327" @default.
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