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• W2777463533 abstract "A complex activity is a temporal composition of sub-events, and a sub-event typically consists of several low level micro-actions, such as body movement of different actors. Extracting these micro actions explicitly is beneficial for complex activity recognition due to actor selectivity, higher discriminative power, and motion clutter suppression. Moreover, considering both static and motion features is vital for activity recognition. However, optimally controlling the contribution from static and motion features still remains uninvestigated. In this work, we extract motion features at micro level, preserving the actor identity, to later obtain a high-level motion descriptor using a probabilistic model. Furthermore, we propose two novel schemas for combining static and motion features: Cholesky-transformation based and entropy-based. The former allows to control the contribution ratio precisely, while the latter obtains the optimal ratio mathematically. The ratio given by the entropy based method matches well with the experimental values obtained by the Choleksy transformation based method. This analysis also provides the ability to characterize a dataset, according to its richness in motion information. Finally, we study the effectiveness of modeling the temporal evolution of sub-event using an LSTM network. Experimental results demonstrate that the proposed technique outperforms state-of-the-art, when tested against two popular datasets." @default.
• W2777463533 created "2018-01-05" @default.
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• W2777463533 date "2017-11-01" @default.
• W2777463533 modified "2023-09-25" @default.
• W2777463533 title "Micro Actions and Deep Static Features for Activity Recognition" @default.
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• W2777463533 doi "https://doi.org/10.1109/dicta.2017.8227463" @default.
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