Finding "Unexplained" Activities in Video

Albanese, Massimiliano; Molinaro, Cristian; Persia, Fabio; Picariello, Antonio; Subrahmanian, V. S.

doi:10.5591/978-1-57735-516-8/IJCAI11-274

Finding "Unexplained" Activities in Video

Massimiliano Albanese, Cristian Molinaro, Fabio Persia, Antonio Picariello, V. S. Subrahmanian

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Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence. Pages 1628-1633.

https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-274

Abstract

Consider a video surveillance application that monitors some location. The application knows a set of activity models (that are either normal or abnormal or both), but in addition, the application wants to find video segments that are unexplained by any of the known activity models — these unexplained video segments may correspond to activities for which no previous activity model existed. In this paper, we formally define what it means for a given video segment to be unexplained (totally or partially) w.r.t. a given set of activity models and a probability threshold. We develop two algorithms – FindTUA and FindPUA – to identify Totally and Partially Unexplained Activities respectively, and show that both algorithms use important pruning methods. We report on experiments with a prototype implementation showing that the algorithms both run efficiently and are accurate.

Massimiliano Albanese, Cristian Molinaro, Fabio Persia, Antonio Picariello, and V. S. Subrahmanian. 2011. Finding "Unexplained" Activities in Video. In Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence, IJCAI-11. IJCAI, 1628–1633. https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-274

@inproceedings{ijcai2011p274,
  title     = {Finding "Unexplained" Activities in Video},
  author    = {Albanese, Massimiliano and Molinaro, Cristian and Persia, Fabio and Picariello, Antonio and Subrahmanian, V. S.},
  booktitle = {Proceedings of the Twenty-Second International Joint Conference on
               Artificial Intelligence, {IJCAI-11}},
  publisher = {AAAI Press/International Joint Conferences on Artificial Intelligence},
  editor    = {Toby Walsh},
  pages     = {1628--1633},
  year      = {2011},
  month     = {7},
  doi       = {10.5591/978-1-57735-516-8/IJCAI11-274},
  url       = {https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-274},
}

TY  - CPAPER
TI  - Finding "Unexplained" Activities in Video
AU  - Albanese, Massimiliano
AU  - Molinaro, Cristian
AU  - Persia, Fabio
AU  - Picariello, Antonio
AU  - Subrahmanian, V. S.
T2  - Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence, IJCAI-11
PB  - AAAI Press/International Joint Conferences on Artificial Intelligence
PY  - 2011
SP  - 1628
EP  - 1633
DO  - 10.5591/978-1-57735-516-8/IJCAI11-274
UR  - https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-274
ER  -