CAGNet: a context-aware graph neural network for detecting social relationships in videos

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Abstract Social relationships, such as parent-offspring and friends, are crucial and stable connections between individuals, especially at the person level, and are essential for accurately describing the semantics of videos. In this paper, we analogize such a task to scene graph generation, which we call video social relationship graph generation (VSRGG). It involves generating a social relationship graph for each video based on person-level relationships. We propose a context-aware graph neural network (CAGNet) for VSRGG, which effectively generates social relationship graphs through message passing, capturing the context of the video. Specifically, CAGNet detects persons in the video, generates an initial graph via relationship proposal, and extracts facial and body features to describe the detected individuals, as well as temporal features to describe their interactions. Then, CAGNet predicts pairwise relationships between individuals using graph message passing. Additionally, we construct a new dataset, VidSoR, to evaluate VSRGG, which contains 72 h of video with 6276 person instances and 5313 relationship instances of eight relationship types. Extensive experiments show that CAGNet can make accurate predictions with a comparatively high mean recall (mRecall) when using only visual features.

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