Surveillance is the monitoring of the behavior, activities, or other changing information, usually of people for the purpose of influencing, managing, directing, or protecting them [1]. Similarly, Visual surveillance is an attempt to detect, recognize and track certain object from image sequences, and more generally to understand and describe object behaviors [2].
Background subtraction, also known as foreground detection is one of the most important pre-processing step in many computer vision applications. Typically the background subtraction process forms the first stage in automated visual surveillance systems, as well as other applications such as motion capture, object tracking and augmented reality.
This topic includes to detecting intrusion, loitering and sterile zone.
Abandoned or removed object detection detection is important issue.