Since 9/11 naval structures and facilities have been recognized as potential critical targets of terrorist acts. Consequently, harbour protection has become a debated topic due to the difficulties inherent in safeguarding such a complex environment. In this paper we will discuss an automatic multi sensor surveillance system designed to detect suspicious events in the harbour area and focus the attention of a remote human operator. Using colour and infrared cameras, the system is able to detect if someone is trying to cross an unauthorized area or if a person or vehicle performs an anomalous pattern of activity. This automatic surveillance system aims to supersede classical CCTV systems by providing effective assistance to the human operator by invoking his attention only when needed. The system can also be used to automatically tag and annotate video streams in order to perform a posteriori automatic query-based retrieval of desired events.


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