public areas continue, which has caused an emerging need for reliable and
large-scale surveillance. Only in Europe, the number of attacks has been up to
200 some years. The probability to experience attacks or terror is low, but the
consequences are serious for people and the society. A solution is detecting
suspicious behaviours and situations, that might cause danger. Unattended and
suspicious bags or objects that are left in airports and other public areas
need to be detected immediately, so the operator can evaluate the situation.
With LiDAR surveillance, all activities are tracked without breaching integrity. If an object is separated from its owner, an alarm is generated and a PTZ camera can be pointed to the direction if allowed. In the environments where camera surveillance is prohibited, an alarm and visualization of the left object’s location can be reported. This would work particularly well in airports, train stations, and other public areas that could be targets for attacks. When someone has left an object, or has tried to hide something, the situation can be detected, and safety precautions can be made.
Every movement and change can be detected if we know what the static scenery should look like. Therefore, a floating reference is saved in real-time and can be compared to all movements and changes. If a new static object enters the scene, an object might have been left by a person. The reference scene is the static environment, where movements such as walking people are filtered out, and the static area is monitored in real-time. The decision on what objects should generate an alarm depends on the need of the area, if a car drives in a walking area, it is considered an abnormality. But if a bike is monitored in a public area, it is allowed. Determining potential danger also depends on the placement of the abandoned or unattended object. An object that has been “hidden” is considered more dangerous than an object that is placed in a way that seems “forgotten”. Then, it can be decided if a suitcase is dangerous by generating an alarm and viewing its placement of it. The analysis and alarm generation are built on sequences of events to increase the reliability and capability to detect potential danger with fewer false alarms.