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Temporal action proposal generation is an important and challenging task invideo understanding, which aims at detecting all temporal segments containingaction instances of interest. The existing proposal generation approaches aregenerally based on pre-defined anchor windows or heuristic bottom-up boundarymatching strategies. This paper presents a simple and efficient framework(RTD-Net) for direct action proposal generation, by re-purposing aTransformer-alike architecture. To tackle the essential visual differencebetween time and space, we make three important improvements over the originaltransformer detection framework (DETR). First, to deal with slowness prior invideos, we replace the original Transformer encoder with a boundary attentivemodule to better capture long-range temporal information. Second, due to theambiguous temporal boundary and relatively sparse annotations, we present arelaxed matching scheme to relieve the strict criteria of single assignment toeach groundtruth. Finally, we devise a three-branch head to further improve theproposal confidence estimation by explicitly predicting its completeness.Extensive experiments on THUMOS14 and ActivityNet-1.3 benchmarks demonstratethe effectiveness of RTD-Net, on both tasks of temporal action proposalgeneration and temporal action detection. Moreover, due to its simplicity indesign, our framework is more efficient than previous proposal generationmethods, without non-maximum suppression post-processing. The code and modelsare made available at https://github.com/MCG-NJU/RTD-Action.

Relaxed Transformer Decoders for Direct Action Proposal Generation