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• W2897054934 abstract "Group activity recognition, a challenging task that a number of individuals occur in the scene of activity while only a small subset of them participate in, has received increasing attentions. However, most of the previous methods model all the individuals' actions equivalently while ignoring a fact that not all of them are contributed to the discrimination of group activity. That is to say, only a small number of key actors (participants) play important roles in the whole group activity. Inspired by this, we explore a new One to Key idea to progressively aggregate temporal dynamics of key actors with different participation degrees over time from each person. Here, we focus on two types of key actors in the whole activity, who steadily move in the whole process (long moving time) or intensely move (but closely related to the group activity) at a significant moment. Based on this, we propose a novel Participation-Contributed Temporal Dynamic Model (PC-TDM) to recognize group activity, which mainly consists of a One network and a One to Key network. Specifically, One network aims at modeling the individual dynamic of each person. One to Key network feeds the outputs from the One network into a Bidirectional LSTM (Bi-LSTM) according to the order of individual's moving time. Subsequently, each output state of Bi-LSTM weighted by a trainable time-varying attention factor is aggregated by going through LSTM one-by-one. Experimental results on two benchmarks demonstrate that the proposed method improves group activity recognition performance compared to the state-of-the-arts." @default.
• W2897054934 created "2018-10-26" @default.
• W2897054934 creator A5017096005 @default.
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• W2897054934 date "2018-10-15" @default.
• W2897054934 modified "2023-10-09" @default.
• W2897054934 title "Participation-Contributed Temporal Dynamic Model for Group Activity Recognition" @default.
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• W2897054934 doi "https://doi.org/10.1145/3240508.3240572" @default.
• W2897054934 hasPublicationYear "2018" @default.
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