Publication

Object Level Visual Reasoning in Videos

European Conference on Computer Vision (ECCV)


Abstract

Human activity recognition is typically addressed by training models to detect key concepts like global and local motion, features related to object classes present in the scene, as well as features related to the global context. The next open challenges in activity recognition require a level of understanding that pushes beyond this, requiring fine distinctions and a detailed comprehension of the interactions between actors and objects in a scene. We propose a model capable of learning to reason about semantically meaningful spatio-temporal interactions in videos. Key to our approach is the choice of performing this reasoning on an object level through the integration of state of the art object instance segmentation networks. This allows the model to learn detailed spatial interactions that exist at a semantic, object-interaction relevant level. We evaluated our method on three standard datasets: the TwentyBN Something-Something dataset, the VLOG dataset and the EPIC Kitchens dataset, and achieve state of the art results on both. Finally, we also show visualizations of the interactions learned by the model, which illustrate object classes and their interactions corresponding to different activity classes.

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