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arXiv · 2001.04583

EGO-TOPO: Environment Affordances from Egocentric Video

Tushar Nagarajan·Yanghao Li·Christoph Feichtenhofer·Kristen Grauman
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Abstract

First-person video naturally brings the use of a physical environment to the forefront, since it shows the camera wearer interacting fluidly in a space based on his intentions. However, current methods largely separate the observed actions from the persistent space itself. We introduce a model for environment affordances that is learned directly from egocentric video. The main idea is to gain a human-centric model of a physical space (such as a kitchen) that captures (1) the primary spatial zones of interaction and (2) the likely activities they support. Our approach decomposes a space into a topological map derived from first-person activity, organizing an ego-video into a series of visits to the different zones. Further, we show how to link zones across multiple related environments (e.g., from videos of multiple kitchens) to obtain a consolidated representation of environment functionality. On EPIC-Kitchens and EGTEA+, we demonstrate our approach for learning scene affordances and anticipating future actions in long-form video.

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Tushar Nagarajan, Yanghao Li, Christoph Feichtenhofer, Kristen Grauman. 2020-01-14. EGO-TOPO: Environment Affordances from Egocentric Video. https://arxiv.org/abs/2001.04583

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