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Spatial–temporal correlations learning and action-background jointed attention for weakly-supervised temporal action localization

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Abstract

Weakly supervised temporal action localization (W-TAL) is designed to detect and classify all the action instances in an untrimmed video with only video-level labels. Due to the lack of frame-level annotations, the correlations learning between action snippets and the separation between action and background are the two key issues for accurate action localization. To mine the intrinsic correlations of space and time embodied in the occurrences of action in a video and identify the action and background in the snippets, a novel method based on spatial–temporal correlations learning and action-background jointed attention for W-TAL is proposed. In this method, the graph convolution and 1-D temporal convolution networks are constructed to learn the spatial and temporal features of the video, respectively, then fused to learn a fruitful spatial–temporal correlative feature map. This ensures more completed features representation for action localization. Next, different from the other methods, action-background jointed attention mechanism is presented to explicitly modelled background as well as action in a three-branch classification network. This classification network can distinguish action and background and realize the separation of action and background better, so as to promote more accurate action localization. Experiments conducted on Thumos14 and ActivityNet1.3 show that our method outperforms state-of-the-art methods, especially at some high t-IoU thresholds, which further validates the effectiveness of our method.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No.61672268).

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Authors and Affiliations

  1. School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Huifen Xia, Yongzhao Zhan & Keyang Cheng

  2. Jiangsu Engineering Research Center of Big Data Ubiquitous Perception and Intelligent Agriculture Applications, Zhenjiang, 212013, Jiangsu, China

    Yongzhao Zhan

  3. Changzhou Vocational Institute of Mechatronic Technology, Wujin, Changzhou, 213164, Jiangsu, China

    Huifen Xia

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  1. Huifen Xia
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  2. Yongzhao Zhan
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Correspondence to Yongzhao Zhan.

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Communicated by B-K Bao.

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Xia, H., Zhan, Y. & Cheng, K. Spatial–temporal correlations learning and action-background jointed attention for weakly-supervised temporal action localization. Multimedia Systems 28, 1529–1541 (2022). https://doi.org/10.1007/s00530-022-00912-y

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