# Rethinking Online Action Detection in Untrimmed Videos: A Novel Online Evaluation Protocol

arXiv: https://arxiv.org/abs/2003.12041 · HTML: https://mlsanity.com/paper/2003.12041/

## Key facts

- Cited by 3 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 26 Mar 2020.

## Built on by (most cited first, 3 of 3)

- [Live Video Captioning](https://mlsanity.com/paper/2406.14206/) (2024)
- [Deep learning-based approaches for human motion decoding in smart walkers for rehabilitation](https://mlsanity.com/paper/2301.05575/) (2023)
- [Scalable Temporal Localization of Sensitive Activities in Movies and TV Episodes](https://mlsanity.com/paper/2206.08429/) (2022)

## Abstract (arXiv)

The Online Action Detection (OAD) problem needs to be revisited. Unlike traditional offline action detection approaches, where the evaluation metrics are clear and well established, in the OAD setting we find very few works and no consensus on the evaluation protocols to be used. In this work we propose to rethink the OAD scenario, clearly defining the problem itself and the main characteristics that the models which are considered online must comply with. We also introduce a novel metric: the Instantaneous Accuracy (IA). This new metric exhibits an online nature and solves most of the limitations of the previous metrics. We conduct a thorough experimental evaluation on 3 challenging datasets, where the performance of various baseline methods is compared to that of the state-of-the-art. Our results confirm the problems of the previous evaluation protocols, and suggest that an IA-based protocol is more adequate to the online scenario. The baselines models and a development kit with the novel evaluation protocol are publicly available: https://github.com/gramuah/ia.