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Querying Objects Modeled by Arbitrary Probability Distributions

  • Christian Böhm
  • Peter Kunath
  • Alexey Pryakhin
  • Matthias Schubert
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4605)

Abstract

In many modern applications such as biometric identification systems, sensor networks, medical imaging, geology, and multimedia databases, the data objects are not described exactly. Therefore, recent solutions propose to model data objects by probability density functions(pdf). Since a pdf describing an uncertain object is often not explicitly known, approximation techniques like Gaussian mixture models(GMM) need to be employed. In this paper, we introduce a method for efficiently indexing and querying GMMs allowing fast object retrieval for arbitrary shaped pdf. We consider probability ranking queries which are very important for probabilistic similarity search. Our method stores the components and weighting functions of each GMM in an index structure. During query processing the mixture models are dynamically reconstructed whenever necessary. In an extensive experimental evaluation, we demonstrate that GMMs yield a compact and descriptive representation of video clips. Additionally, we show that our new query algorithm outperforms competitive approaches when answering the given probabilistic queries on a database of GMMs comprising about 100.000 single Gaussians.

Keywords

Sensor Network Video Clip Gaussian Mixture Model Query Processing Index Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Christian Böhm
    • 1
  • Peter Kunath
    • 1
  • Alexey Pryakhin
    • 1
  • Matthias Schubert
    • 1
  1. 1.Institute for Computer Science, Ludwig-Maximilians Universität München 

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