Time-dependent HMMs for visual intrusion detection

@article{Kettnaker2003TimedependentHF,
  title={Time-dependent HMMs for visual intrusion detection},
  author={Vera M. Kettnaker},
  journal={2003 Conference on Computer Vision and Pattern Recognition Workshop},
  year={2003},
  volume={4},
  pages={34-34}
}
We propose a new Hidden Markov Model with time-dependent states. Estimation of this model is shown to be as fast and easy as the estimation of regular HMMs. We demonstrate the usefulness and feasibility of such time-dependent HMMs with an application in which illegitimate access to personnel-only rooms in airports etc. can be distinguished from access by legitimate personnel, based on differences in the time of access or differences in the motion trajectories. 
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