Background Subtraction and Lane Occupancy Analysis
Erhan Akın, S. Nima, G. Saameh · InTech eBooks · 2011
In Tripwire systems the camera is used to simulate usage of a conventional detector by using small localized regions of the image as detector sites.Such a system can be used to detect the state of a traffic light (red, yellow, green) check if a reserved section has been violated, and detect wrong-way traffic etc. Tracking systems detect and track individual vehicles moving through the camera scene.They provide a description of vehicle movements (east bound, west bound, etc.) which can also reveal new events such as sudden lane changes and help detect vehicles travelling in the wrong direction.Tracking systems can also compute trajectories and conclude on accidents when different trajectories cross each other and then motion stops.Spatial analysis based systems on the other hand concentrate on analyzing the two-dimensional information that video images provided.Instead of considering traffic on a vehicle-to-vehicle basis, they attempt to measure how the visible road surface is being utilized.Whichever approach is employed, the segmentation of mobile objects present in frames of a video sequence is a fundamental step for many video based applications.In the literature this step is referred to as the background subtraction.The process includes creation of a background model and then updating it with each newly arriving frame from a sequence.Newly arriving frame from a video sequence.The updating of the background model can be Background Subtraction and LaneOccupancy Analysis 10 www.intechopen.com