UNIK: A Unified Framework for Real-world Skeleton-based Action Recognition

• URL: http://arxiv.org/abs/2107.08580v1
• Date: Mon, 19 Jul 2021 02:00:28 GMT
• Title: UNIK: A Unified Framework for Real-world Skeleton-based Action Recognition
• Authors: Di Yang, Yaohui Wang, Antitza Dantcheva, Lorenzo Garattoni, Gianpiero Francesca, Francois Bremond
• Abstract summary: We introduce UNIK, a novel skeleton-based action recognition method that is able to generalize across datasets. To study the cross-domain generalizability of action recognition in real-world videos, we re-evaluate state-of-the-art approaches as well as the proposed UNIK. Results show that the proposed UNIK, with pre-training on Posetics, generalizes well and outperforms state-of-the-art when transferred onto four target action classification datasets.
• Score: 11.81043814295441
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Action recognition based on skeleton data has recently witnessed increasing attention and progress. State-of-the-art approaches adopting Graph Convolutional networks (GCNs) can effectively extract features on human skeletons relying on the pre-defined human topology. Despite associated progress, GCN-based methods have difficulties to generalize across domains, especially with different human topological structures. In this context, we introduce UNIK, a novel skeleton-based action recognition method that is not only effective to learn spatio-temporal features on human skeleton sequences but also able to generalize across datasets. This is achieved by learning an optimal dependency matrix from the uniform distribution based on a multi-head attention mechanism. Subsequently, to study the cross-domain generalizability of skeleton-based action recognition in real-world videos, we re-evaluate state-of-the-art approaches as well as the proposed UNIK in light of a novel Posetics dataset. This dataset is created from Kinetics-400 videos by estimating, refining and filtering poses. We provide an analysis on how much performance improves on smaller benchmark datasets after pre-training on Posetics for the action classification task. Experimental results show that the proposed UNIK, with pre-training on Posetics, generalizes well and outperforms state-of-the-art when transferred onto four target action classification datasets: Toyota Smarthome, Penn Action, NTU-RGB+D 60 and NTU-RGB+D 120.

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