Coarse-Fine Networks for Temporal Activity Detection in Videos

• URL: http://arxiv.org/abs/2103.01302v1
• Date: Mon, 1 Mar 2021 20:48:01 GMT
• Title: Coarse-Fine Networks for Temporal Activity Detection in Videos
• Authors: Kumara Kahatapitiya and Michael S. Ryoo
• Abstract summary: We introduce 'Co-Fine Networks', a two-stream architecture which benefits from different abstractions of temporal resolution to learn better video representations for long-term motion. We show that our method can outperform the state-of-the-arts for action detection in public datasets with a significantly reduced compute and memory footprint.
• Score: 45.03545172714305
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this paper, we introduce 'Coarse-Fine Networks', a two-stream architecture which benefits from different abstractions of temporal resolution to learn better video representations for long-term motion. Traditional Video models process inputs at one (or few) fixed temporal resolution without any dynamic frame selection. However, we argue that, processing multiple temporal resolutions of the input and doing so dynamically by learning to estimate the importance of each frame can largely improve video representations, specially in the domain of temporal activity localization. To this end, we propose (1) `Grid Pool', a learned temporal downsampling layer to extract coarse features, and, (2) `Multi-stage Fusion', a spatio-temporal attention mechanism to fuse a fine-grained context with the coarse features. We show that our method can outperform the state-of-the-arts for action detection in public datasets including Charades with a significantly reduced compute and memory footprint.

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