Abstract
The objective of group activity recognition is to identify behaviors performed by multiple individuals within a given scene. However, current weakly supervised approaches often rely on object detectors or use self-attention mechanisms. The former approach is susceptible to background clutter and entails high computational costs, while the latter method learns weights from the input video and assigns them to key targets which is not reliable enough to find the key person. To address these limitations, we present a novel weakly supervised framework. Our proposed framework eliminates the need for ground-truth bounding boxes or object detectors. Meanwhile, it incorporates the semantics of individual action labels to replace self-attention to guide the learning process, enabling the extraction of more sophisticated semantic features relevant to activity. This approach also explores the interactions to promote group activity classification. Experimental results demonstrate that our method achieves state-of-the-art performances on both volleyball and collective datasets.
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Acknowledgments
This work has been supported by the National Natural Science Foundation of China under Grants No. 62106011, 62336010, 61976010, and 62106010. We gratefully acknowledge their financial support, which has enabled us to conduct this research.
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Liu, T., **ang, Y., Wu, L., Shi, G. (2023). Semantic Guided Attention for Weakly Supervised Group Activity Recognition. In: Yongtian, W., Lifang, W. (eds) Image and Graphics Technologies and Applications. IGTA 2023. Communications in Computer and Information Science, vol 1910. Springer, Singapore. https://doi.org/10.1007/978-981-99-7549-5_17
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