English

Rethinking matching-based few-shot action recognition

Computer Vision and Pattern Recognition 2023-03-29 v1

Abstract

Few-shot action recognition, i.e. recognizing new action classes given only a few examples, benefits from incorporating temporal information. Prior work either encodes such information in the representation itself and learns classifiers at test time, or obtains frame-level features and performs pairwise temporal matching. We first evaluate a number of matching-based approaches using features from spatio-temporal backbones, a comparison missing from the literature, and show that the gap in performance between simple baselines and more complicated methods is significantly reduced. Inspired by this, we propose Chamfer++, a non-temporal matching function that achieves state-of-the-art results in few-shot action recognition. We show that, when starting from temporal features, our parameter-free and interpretable approach can outperform all other matching-based and classifier methods for one-shot action recognition on three common datasets without using temporal information in the matching stage. Project page: https://jbertrand89.github.io/matching-based-fsar

Keywords

Cite

@article{arxiv.2303.16084,
  title  = {Rethinking matching-based few-shot action recognition},
  author = {Juliette Bertrand and Yannis Kalantidis and Giorgos Tolias},
  journal= {arXiv preprint arXiv:2303.16084},
  year   = {2023}
}

Comments

Accepted at SCIA 2023

R2 v1 2026-06-28T09:38:12.912Z