**4.1 Databases**

Despite the fact that a number of surveillance video systems have been deployed, very few surveillance databases are available. One reason is that surveillance videos concern to human and organization privacy. Recently, several surveillance video databases such as CAVIAR, i-LIDS, CARETAKER have been released for research purpose. CAVIAR (Context Aware Vision using Image-based Active Recognition) is a project funded by the EC's Information Society Technology's programme project IST 2001 37540. This project addresses two surveillance applications: city centre surveillance and marketers. Corresponding to these applications, two databases are available. Video clips in the first database were filmed with a wide angle camera lens in the entrance lobby of the INRIA Labs at Grenoble (France) while those of the second database are filmed with a wide angle lens along and across the hallway in a shopping centre in Lisbon (Portugal). Moreover, videos of these databases are annotated. 2008 i-LIDS Multiple-Camera Tracking Scenario (MCTS) is a data set with multiple camera views from a busy airport arrival hall (Zheng, Gong et al. 2009). In the context of CARETAKER (Content Analysis and REtrieval Technologies to Apply Extraction to massive Recording), a video surveillance database is available. This project aims at studying, developing and assessing multimedia knowledge-based content analysis, knowledge extraction components and meta data management sub-systems in the context of automated situation awareness, diagnosis and decision support. During this project, a real testbed sites inside the metro of Roma and Torin, involving more than 30 sensors (20 cameras and 10 microphones) have been provided.
