MultiSports: A Multi-Person Video Dataset of Spatio-Temporally Localized Sports Actions

• URL: http://arxiv.org/abs/2105.07404v1
• Date: Sun, 16 May 2021 10:40:30 GMT
• Title: MultiSports: A Multi-Person Video Dataset of Spatio-Temporally Localized Sports Actions
• Authors: Yixuan Li, Lei Chen, Runyu He, Zhenzhi Wang, Gangshan Wu, Limin Wang
• Abstract summary: This paper aims to present a new multi-person dataset of atomic-temporal actions, coined as MultiSports. We build the dataset of MultiSports v1.0 by selecting 4 sports classes, collecting around 3200 video clips, and annotating around 37790 action instances with 907k bounding boxes.
• Score: 39.27858380391081
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Spatio-temporal action detection is an important and challenging problem in video understanding. The existing action detection benchmarks are limited in aspects of small numbers of instances in a trimmed video or relatively low-level atomic actions. This paper aims to present a new multi-person dataset of spatio-temporal localized sports actions, coined as MultiSports. We first analyze the important ingredients of constructing a realistic and challenging dataset for spatio-temporal action detection by proposing three criteria: (1) motion dependent identification, (2) with well-defined boundaries, (3) relatively high-level classes. Based on these guidelines, we build the dataset of Multi-Sports v1.0 by selecting 4 sports classes, collecting around 3200 video clips, and annotating around 37790 action instances with 907k bounding boxes. Our datasets are characterized with important properties of strong diversity, detailed annotation, and high quality. Our MultiSports, with its realistic setting and dense annotations, exposes the intrinsic challenge of action localization. To benchmark this, we adapt several representative methods to our dataset and give an in-depth analysis on the difficulty of action localization in our dataset. We hope our MultiSports can serve as a standard benchmark for spatio-temporal action detection in the future. Our dataset website is at https://deeperaction.github.io/multisports/.

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