A video based system and method for detecting and counting persons traversing at least two areas being monitored. The method includes the steps of initialization of at least one end unit, having at least a camera, the camera producing images of at least a first area being monitored and a second area...http://www.google.com/patents/US7612796?utm_source=gb-gplus-sharePatent US7612796 - Video-based system and method for counting persons traversing areas being monitored
