Multi-shot Temporal Event Localization: a Benchmark
This paper addresses the problem of localizing events captured by multiple cameras for researchers working on temporal event localization, which is an incremental step towards more realistic scenarios.
This paper introduces multi-shot temporal event localization, a new task where events are captured across multiple camera shots. They collected MUSES, a large dataset with 31,477 event instances and 716 video hours, featuring an average of 19 shots per instance. State-of-the-art methods achieve only 13.1% mAP at IoU=0.5 on this dataset.
Current developments in temporal event or action localization usually target actions captured by a single camera. However, extensive events or actions in the wild may be captured as a sequence of shots by multiple cameras at different positions. In this paper, we propose a new and challenging task called multi-shot temporal event localization, and accordingly, collect a large scale dataset called MUlti-Shot EventS (MUSES). MUSES has 31,477 event instances for a total of 716 video hours. The core nature of MUSES is the frequent shot cuts, for an average of 19 shots per instance and 176 shots per video, which induces large intrainstance variations. Our comprehensive evaluations show that the state-of-the-art method in temporal action localization only achieves an mAP of 13.1% at IoU=0.5. As a minor contribution, we present a simple baseline approach for handling the intra-instance variations, which reports an mAP of 18.9% on MUSES and 56.9% on THUMOS14 at IoU=0.5. To facilitate research in this direction, we release the dataset and the project code at https://songbai.site/muses/ .