Recognizing suspicious activities in infrared imagery using appearance-based features and the theory of hidden conditional random fields for outdoor perimeter surveillance

Savvas Rogotis; Christos Palaskas; Dimosthenis Ioannidis; Dimitrios Tzovaras; Spiros Likothanassis

doi:10.1117/1.JEI.24.6.061111

22 December 2015 Recognizing suspicious activities in infrared imagery using appearance-based features and the theory of hidden conditional random fields for outdoor perimeter surveillance

Savvas Rogotis, Christos Palaskas, Dimosthenis Ioannidis, Dimitrios Tzovaras, Spiros Likothanassis

Author Affiliations +

Journal of Electronic Imaging, Vol. 24, Issue 6, 061111 (December 2015). https://doi.org/10.1117/1.JEI.24.6.061111

Abstract

This work aims to present an extended framework for automatically recognizing suspicious activities in outdoor perimeter surveilling systems based on infrared video processing. By combining size-, speed-, and appearance-based features, like the local phase quantization and the histograms of oriented gradients, actions of small duration are recognized and used as input, along with spatial information, for modeling target activities using the theory of hidden conditional random fields (HCRFs). HCRFs are used to classify an observation sequence into the most appropriate activity label class, thus discriminating high-risk activities like trespassing from zero risk activities, such as loitering outside the perimeter. The effectiveness of this approach is demonstrated with experimental results in various scenarios that represent suspicious activities in perimeter surveillance systems.

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Savvas Rogotis, Christos Palaskas, Dimosthenis Ioannidis, Dimitrios Tzovaras, and Spiros Likothanassis "Recognizing suspicious activities in infrared imagery using appearance-based features and the theory of hidden conditional random fields for outdoor perimeter surveillance," Journal of Electronic Imaging 24(6), 061111 (22 December 2015). https://doi.org/10.1117/1.JEI.24.6.061111

Published: 22 December 2015

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