Tag: motion detection

How Motion Detection Works in IP Camera Systems

Many IP cameras include motion detection capability. It is also available using video management software (VMS) or a network video recorder (NVR).   This is a very important analytic function because it controls when an alarm is triggered and when the video is recorded.

Motion detection seems to be a simple concept.  All we do is compare one frame to another and look for things that change.   For example, a moving white ball can trigger an alarm by comparing two frames.

white ball motion detect

Well, it isn’t that simple.  The early engineers who worked on motion detection discovered that this was a difficult engineering problem. Back in the 1970’s, I worked on a project to detect moving particles in fluids.  What I discovered was that it is sometimes difficult to discern the difference between a moving object and signal noise.

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