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UnLoc: A Unified Framework for Video Localization Tasks

21 Aug 2023ICCV 2023 1arXiv:2308.11062archive 2025-07-28

Shen Yan, Xuehan Xiong, Arsha Nagrani, Anurag Arnab, Zhonghao Wang, Weina Ge, David Ross, Cordelia Schmid

While large-scale image-text pretrained models such as CLIP have been used for multiple video-level tasks on trimmed videos, their use for temporal localization in untrimmed videos is still a relatively unexplored task. We design a new approach for this called UnLoc, which uses pretrained image and text towers, and feeds tokens to a video-text fusion model. The output of the fusion module are then used to construct a feature pyramid in which each level connects to a head to predict a per-frame relevancy score and start/end time displacements. Unlike previous works, our architecture enables Moment Retrieval, Temporal Localization, and Action Segmentation with a single stage model, without the need for action proposals, motion based pretrained features or representation masking. Unlike specialized models, we achieve state of the art results on all three different localization tasks with a unified approach. Code will be available at: \url{https://github.com/google-research/scenic}.

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Code

google-research/scenic officialmentioned in papermentioned on GitHubjax report

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Tasks

Action SegmentationMoment RetrievalNatural Language Moment RetrievalRetrievalTemporal Action LocalizationTemporal LocalizationZero-Shot Action Detection

Results from the paper archive 2025-07-28

TaskDatasetModelMetricValueRank at snapshotLeaderboardReport
Action Segmentation COIN UnLoc-L Frame accuracy 72.8 #1 of 9 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-L R@1 IoU=0.5 60.8 #11 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-L R@1 IoU=0.7 38.4 #11 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-L R@5 IoU=0.5 88.2 #11 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-L R@5 IoU=0.7 61.1 #11 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-B R@1 IoU=0.5 58.1 #17 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-B R@1 IoU=0.7 35.4 #17 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-B R@5 IoU=0.5 87.4 #17 of 25 Archive leaderboard report
Moment Retrieval Charades-STA UnLoc-B R@5 IoU=0.7 59.1 #17 of 25 Archive leaderboard report
Moment Retrieval QVHighlights UnLoc-L R@1 IoU=0.5 66.1 #30 of 32 Archive leaderboard report
Moment Retrieval QVHighlights UnLoc-L R@1 IoU=0.7 46.7 #30 of 32 Archive leaderboard report
Moment Retrieval QVHighlights UnLoc-B R@1 IoU=0.5 64.5 #31 of 32 Archive leaderboard report
Moment Retrieval QVHighlights UnLoc-B R@1 IoU=0.7 48.8 #31 of 32 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-L R@1,IoU=0.5 48.3 #4 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-L R@1,IoU=0.7 30.2 #4 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-L R@5,IoU=0.5 79.2 #4 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-L R@5,IoU=0.7 61.3 #4 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-B R@1,IoU=0.5 48.0 #5 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-B R@1,IoU=0.7 29.7 #5 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-B R@5,IoU=0.5 81.5 #5 of 8 Archive leaderboard report
Natural Language Moment Retrieval ActivityNet Captions UnLoc-B R@5,IoU=0.7 61.4 #5 of 8 Archive leaderboard report
Temporal Action Localization ActivityNet-1.3 UnLoc-L mAP IOU@0.5 59.3 #33 of 33 Archive leaderboard report

Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.

Methods

CLIP

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