In this paper, we introduce a novel problem of audio-visual event localization in unconstrained videos. We define an audio-visual event as an event that is both visible and audible in a video segment. We collect an Audio-Visual Event(AVE) dataset to systemically investigate three temporal localization tasks: supervised and weakly-supervised audio-visual event localization, and cross-modality localization. We develop an audio-guided visual attention mechanism to explore audio-visual correlations, propose a dual multimodal residual network (DMRN) to fuse information over the two modalities, and introduce an audio-visual distance learning network to handle the cross-modality localization. Our experiments support the following findings: joint modeling of auditory and visual modalities outperforms independent modeling, the learned attention can capture semantics of sounding objects, temporal alignment is important for audio-visual fusion, the proposed DMRN is effective in fusing audio-visual features, and strong correlations between the two modalities enable cross-modality localization.

本文介绍了一个新的无约束视频中的音频视觉事件定位问题，使用AVE数据集进行研究，提出了使用双模态残差网络结合音频引导视觉注意力机制处理音频视觉相关性的方案，并针对跨模态定位提出跨模态距离学习网络。实验结果表明，联合建模听觉和视觉模型优于独立建模，学习到的注意力可以捕捉声音对象的语义，音频视觉融合的时序对齐很重要，所提出的DMRN在融合音频视觉特征方面非常有效，两个模态之间的强相关性使跨模态定位成为可能。

无约束视频中的视听事件定位