Natural Language Video Moment Localization Through Query-Controlled Temporal Convolution

The goal of natural language video moment localization is to locate a short segment of a long, untrimmed video that corresponds to a description presented as natural text. The description may contain several pieces of key information, including subjects/objects, sequential actions, and locations. Here, we propose a novel video moment localization framework based on the convolutional response between multimodal signals, i.e., the video sequence, the text query, and subtitles for the video if they are available. We emphasize the effect of the language sequence as a query about the video content, by converting the query sentence into a boundary detector with a filter kernel size and stride. We convolve the video sequence with the query detector to locate the start and end boundaries of the target video segment. When subtitles are available, we blend the boundary heatmaps from the visual and subtitle branches together using an LSTM to capture asynchronous dependencies across two modalities in the video. We perform extensive experiments on the TVR, Charades-STA, and TACoS benchmark datasets, demonstrating that our model achieves state-of-the-art results on all three.