Multilevel Language and Vision Integration for Text-to-Clip Retrieval

  • Huijuan Xu University of California, Berkeley
  • Kun He Boston University
  • Bryan A. Plummer Boston University
  • Leonid Sigal University of British Columbia
  • Stan Sclaroff Boston University
  • Kate Saenko Boston University

Abstract

We address the problem of text-based activity retrieval in video. Given a sentence describing an activity, our task is to retrieve matching clips from an untrimmed video. To capture the inherent structures present in both text and video, we introduce a multilevel model that integrates vision and language features earlier and more tightly than prior work. First, we inject text features early on when generating clip proposals, to help eliminate unlikely clips and thus speed up processing and boost performance. Second, to learn a fine-grained similarity metric for retrieval, we use visual features to modulate the processing of query sentences at the word level in a recurrent neural network. A multi-task loss is also employed by adding query re-generation as an auxiliary task. Our approach significantly outperforms prior work on two challenging benchmarks: Charades-STA and ActivityNet Captions.

Published
2019-07-17
Section
AAAI Technical Track: Vision