ACSNet: Action-Context Separation Network for Weakly Supervised Temporal Action Localization

• URL: http://arxiv.org/abs/2103.15088v1
• Date: Sun, 28 Mar 2021 09:20:54 GMT
• Title: ACSNet: Action-Context Separation Network for Weakly Supervised Temporal Action Localization
• Authors: Ziyi Liu, Le Wang, Qilin Zhang, Wei Tang, Junsong Yuan, Nanning Zheng, Gang Hua
• Abstract summary: We introduce an Action-Context Separation Network (ACSNet) that takes into account context for accurate action localization. ACSNet outperforms existing state-of-the-art WS-TAL methods by a large margin.
• Score: 148.55210919689986
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The object of Weakly-supervised Temporal Action Localization (WS-TAL) is to localize all action instances in an untrimmed video with only video-level supervision. Due to the lack of frame-level annotations during training, current WS-TAL methods rely on attention mechanisms to localize the foreground snippets or frames that contribute to the video-level classification task. This strategy frequently confuse context with the actual action, in the localization result. Separating action and context is a core problem for precise WS-TAL, but it is very challenging and has been largely ignored in the literature. In this paper, we introduce an Action-Context Separation Network (ACSNet) that explicitly takes into account context for accurate action localization. It consists of two branches (i.e., the Foreground-Background branch and the Action-Context branch). The Foreground- Background branch first distinguishes foreground from background within the entire video while the Action-Context branch further separates the foreground as action and context. We associate video snippets with two latent components (i.e., a positive component and a negative component), and their different combinations can effectively characterize foreground, action and context. Furthermore, we introduce extended labels with auxiliary context categories to facilitate the learning of action-context separation. Experiments on THUMOS14 and ActivityNet v1.2/v1.3 datasets demonstrate the ACSNet outperforms existing state-of-the-art WS-TAL methods by a large margin.

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