Motion Detection (MD) is a common video analytics function that is supported by most of the IP cameras in the market with the purpose of detecting moving objects (people, vehicles) in the view of the camera and taking necessary actions.
The motion detection system inside the IP camera is able to analyze the video frames and decide whether there has been any motion in the user defined region that has exceeded the allowed limit of speed and size. When the motion occurs that results with an alarm, the camera can either execute several responses to the alarm directly or notify the video management system (NVR, CMS) in the control site and let the control site respond to the events.
Motion detection system is one of the many advantages of IP cameras over analog cameras. The analog camera is just the “eye” and cannot analyze motion on the video. All the motion analysis has to be done on DVR side, resulting with following risks – the failure of DVR would hurt the motion detection capability of all the channels of the same site while in case of IP system each camera is independent from NVR - it can detect motion and handle the responses directly and instantly regardless of the status of NVR. Furthermore, since every IP camera has its own “brain” to analyze video stream, there will never be computing power limitation issues and consequently false or missed motion detection alarms that may occur in case of DVR based motion detection systems.
This article introduces the motion detection system of ACTi cameras, including the configuration advice and the management of motion triggered events.
Reviewed on 2010.12.02: The section of Questions and Answers was added to the end of the article, including the explaination about the conditions under which the motion detection system is available and how the redundant motion event filter of NVR works.