多时间尺度一致性的弱监督时序动作定位

doi:10.3778/j.issn.1002-8331.2201-0233

摘要/Abstract

摘要： 由于弱监督时序动作定位模型使用视频级的标签作为监督信号，模型在识别出动作实例中最具区分性的视频片段时，也会将和视频级标签有关的背景片段误认为是动作，难以产生完整的动作提议。为了进一步检测动作片段，通过分析动作片段在多时间尺度上标记的一致性，提出了一种多时间尺度一致性的弱监督时序动作定位方法。对输入的视频帧提取RGB和光流的特征，设计一种多时间尺度的模块，使用不同尺寸的卷积核建模视频的时序关系。通过估计多时间尺度特征的时间类激活图，并对多分支的时间类激活图进行融合，获得多时间尺度一致性的动作预测标签。为了进一步优化模型预测的动作标签，采用迭代优化策略，在每次迭代中更新预测标签，并为模型训练提供有效的帧级监督信号。在THUMOS14和ActivityNet1.3数据集上进行实验验证，实验结果表明，方法性能优于现有弱监督时序动作定位方法。

关键词: 弱监督, 时序动作定位, 多时间尺度, 一致性

Abstract: Weakly supervised temporal action localization model identifies the most distinctive video segments in the action instances, and also mistakes the background segment related to the video-level labels as an action, it is difficult to get a complete action proposal because of using the video-level label as the supervision signal. In order to further detect action segments, a multi-temporal scales consensus for weakly supervised temporal action localization method is proposed by analyzing the consistency of action segments on multi-temporal scales. Firstly, the features of RGB and optical flow are extracted from the input video frames, and a multi-temporal scale module is designed to model the video temporal relationship using convolution kernels of different sizes. Secondly, the predicted action labels with multi-temporal scales consensus are obtained by estimating the multi-time scale feature time class activation map and fusing the multi-branch time class activation map. Finally, in order to further optimize the action labels predicted by the model, the iterative optimization strategy is adopted to update the prediction labels in each iteration, and provide effective frame-level supervision signals for model training. Experiments are conducted on THUMOS14 and ActivityNet1.3 datasets. Experimental results show that the proposed network is superior to the state-of-the-art methods.

Key words: weakly supervised, temporal action localization, multi-temporal scales, consensus

郭文斌, 杨兴明, 蒋哲远, 吴克伟, 谢昭. 多时间尺度一致性的弱监督时序动作定位[J]. 计算机工程与应用, 2023, 59(10): 151-161.

GUO Wenbin, YANG Xingming, JIANG Zheyuan, WU Kewei, XIE Zhao. Multi-Temporal Scales Consensus for Weakly Supervised Temporal Action Localization[J]. Computer Engineering and Applications, 2023, 59(10): 151-161.

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