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Weakly supervised detection of video events using hidden conditional random fields

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International Journal of Multimedia Information Retrieval Aims and scope Submit manuscript

Abstract

Multimedia Event Detection (MED) is the task to identify videos in which a certain event occurs. This paper addresses two problems in MED: weakly supervised setting and unclear event structure. The first indicates that since associations of shots with the event are laborious and incur annotator’s subjectivity, training videos are loosely annotated as to whether the event is contained or not. It is unknown which shots are relevant or irrelevant to the event. The second problem is the difficulty of assuming the event structure in advance, due to arbitrary camera and editing techniques. To tackle these problems, we propose a method using a Hidden Conditional Random Field (HCRF) which is a probabilistic discriminative classifier with a set of hidden states. We consider that the weakly supervised setting can be handled using hidden states as the intermediate layer to discriminate between relevant and irrelevant shots to the event. In addition, an unclear structure of the event can be exposed by features of each hidden state and its relation to the other states. Based on the above idea, we optimise hidden states and their relation so as to distinguish training videos containing the event from the others. Also, to exploit the full potential of HCRFs, we establish approaches for training video preparation, parameter initialisation and fusion of multiple HCRFs. Experimental results on TRECVID video data validate the effectiveness of our method.

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Notes

  1. It is not reasonable to initialise \(\varvec{\theta }_\mathrm{weight}(h_{i})\) as the centre of the \(i\)th cluster because of the difference of value ranges. While \(\varvec{\theta }_\mathrm{weight}(h_{i})\) takes both positive and negative values, the cluster centre does not take negative ones because concept detection scores lie between \(0\) and \(1\).

  2. We also tested PCA to make each dimension (concept) independent of each other, and the normalisation to obtain uniformed dimensions with the mean zero and the variance one. However, neither of them worked well. It can be considered that detection scores for each concept are appropriately biased by the detector, so editing their distribution does not offer improvement.

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Acknowledgments

The research work by Kimiaki Shirahama leading to this article has been funded by the Postdoctoral Fellowship for Research Abroad by Japan Society for the Promotion of Science (JSPS). Also, this work was in part supported by JSPS through Grand-in-Aid for Scientific Research (B): KAKENHI (26280040).

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Authors and Affiliations

  1. Pattern Recognition Group, University of Siegen, Hoelderlinstr. 3, 57076, Siegen, Germany

    Kimiaki Shirahama & Marcin Grzegorzek

  2. Graduate School of System Informatics, Kobe University, 1-1, Rokkodai, Nada, Kobe, 657-8501, Japan

    Kuniaki Uehara

Authors
  1. Kimiaki Shirahama
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  2. Marcin Grzegorzek
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  3. Kuniaki Uehara
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Correspondence to Kimiaki Shirahama.

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Shirahama, K., Grzegorzek, M. & Uehara, K. Weakly supervised detection of video events using hidden conditional random fields. Int J Multimed Info Retr 4, 17–32 (2015). https://doi.org/10.1007/s13735-014-0068-6

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  • DOI: https://doi.org/10.1007/s13735-014-0068-6

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