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AIC Seminar Series

Learning hierarchical invariant spatio-temporal features for action recognition

Quoc V. LeStanford University[Home Page]

Notice:  Hosted by Hung Bui

Date:  2011-11-17 at 16:00

Location:  EJ228 (SRI E building)  (Directions)

   Abstract

Previous work on action recognition has focused on adapting hand-designed local features, such as SIFT or HOG, from static images to the video domain. In this paper, we propose using unsupervised feature learning as a way to learn features directly from video data. More specifically, we present an improvement of the Independent Subspace Analysis algorithm to learn invariant spatio-temporal features from unlabeled video data. We discovered that, despite its simplicity, this method performs surprisingly well when combined with deep learning techniques such as stacking and convolution to learn hierarchical representations. By replacing expert hand-designed features with our machine learned features, we achieve classification results superior to all previous published results on all computer vision benchmarks. Further benefits of this method, such as the ease of training and the efficiency of training and prediction, will also be discussed. You can download our code and learned spatio-temporal features here: http://ai.stanford.edu/∼quocle/

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