Abstract:The audio-visual event localization (AVEL) task locates events in a video by observing audio information and corresponding visual information. In this paper, a cross-modal time alignment network named CMTAN is designed for the AVEL task. The network consists of four parts: preprocessing, cross-modal interaction, time alignment, and feature fusion. Specifically, in the preprocessing part, the background and noise in the modal information are reduced by the processing of a new cross-modal audio guidance module and a noise reduction module. Then, in the cross-modal interaction part, the information reinforcement and information complementation modules based on the multi-head attention mechanism are used for cross-modal interaction, and the unimodal information is optimized with global information. In the time alignment part, a time alignment module focusing on the unimodal global information before and after cross-modal interaction is designed to perform feature alignment of modal information. Finally, in the feature fusion process, two kinds of modal information are fused from shallow to deep by a multi-stage fusion module. The fused modal information is ultimately used for event localization. Extensive experiments demonstrate that CMTAN has excellent performance in both weakly and fully supervised AVEL tasks.