The Community for Technology Leaders
CVPR 2011 (2011)
Providence, RI
June 20, 2011 to June 25, 2011
ISBN: 978-1-4577-0394-2
pp: 3361-3368
Q. V. Le , Comput. Sci. Dept., Stanford Univ., Stanford, CA, USA
W. Y. Zou , Comput. Sci. Dept., Stanford Univ., Stanford, CA, USA
S. Y. Yeung , Comput. Sci. Dept., Stanford Univ., Stanford, CA, USA
A. Y. Ng , Comput. Sci. Dept., Stanford Univ., Stanford, CA, USA
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 extension 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 hand-designed features with our learned features, we achieve classification results superior to all previous published results on the Hollywood2, UCF, KTH and YouTube action recognition datasets. On the challenging Hollywood2 and YouTube action datasets we obtain 53.3% and 75.8% respectively, which are approximately 5% better than the current best published results. 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:
YouTube action recognition dataset, hierarchical invariant spatio-temporal feature learning technique, action recognition, hand-designed local feature, SIFT, HOG, static image, video domain, unsupervised feature learning, video data, independent subspace analysis algorithm, hierarchical representation, UCF, KTH

Q. V. Le, W. Y. Zou, S. Y. Yeung and A. Y. Ng, "Learning hierarchical invariant spatio-temporal features for action recognition with independent subspace analysis," CVPR 2011(CVPR), Providence, RI, 2011, pp. 3361-3368.
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