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Computer Science > Computer Vision and Pattern Recognition

arXiv:2207.03095 (cs)
[Submitted on 7 Jul 2022]

Title:EPIC-KITCHENS-100 Unsupervised Domain Adaptation Challenge for Action Recognition 2022: Team HNU-FPV Technical Report

Authors:Nie Lin, Minjie Cai
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Abstract:In this report, we present the technical details of our submission to the 2022 EPIC-Kitchens Unsupervised Domain Adaptation (UDA) Challenge. Existing UDA methods align the global features extracted from the whole video clips across the source and target domains but suffer from the spatial redundancy of feature matching in video recognition. Motivated by the observation that in most cases a small image region in each video frame can be informative enough for the action recognition task, we propose to exploit informative image regions to perform efficient domain alignment. Specifically, we first use lightweight CNNs to extract the global information of the input two-stream video frames and select the informative image patches by a differentiable interpolation-based selection strategy. Then the global information from videos frames and local information from image patches are processed by an existing video adaptation method, i.e., TA3N, in order to perform feature alignment for the source domain and the target domain. Our method (without model ensemble) ranks 4th among this year's teams on the test set of EPIC-KITCHENS-100.
Comments: Technical report for CVPR 2022 EPIC-Ego4D Workshop (EPIC Challenge)
Subjects: Computer Vision and Pattern Recognition (cs.CV)
Cite as: arXiv:2207.03095 [cs.CV]
  (or arXiv:2207.03095v1 [cs.CV] for this version)
  https://doi.org/10.48550/arXiv.2207.03095

Submission history

From: Nie Lin [view email]
[v1] Thu, 7 Jul 2022 05:27:32 UTC (3,466 KB)
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