Responding to disasters or emergency medical situations requires triage — the process of determining the priority of treating patients based on the severity of their condition.
Video motion detection employs a similar process in that it prioritizes only the important events and area’s of a camera’s view that you specify to be included or excluded for motion detection.
By prioritizing video recordings, video motion detection (VMD) saves on storage space and bandwidth by not having to record everything making searching for occurences easier as well.
Video motion detection function in similar ways for both internal and external implementations in that they will:
“External” VMD is a function in IP camera software for cameras that don’t have this feature built-in. The video management software program analyzes video sent from the cameras, analyzes the activity, and then triggers any alerts that you have programmed.
For example, a camera like the Axis P1311 Fixed IP Camera has built-in video motion detection, audio detection, and detection of camera tampering attempts. And the ACTi ACD-2000Q is a 4-channel video server with video motion detection and alarm responses.
“Security Info Watch has a great article, “Thinking About Motion Detection?”, by Kenneth Gentile that outlines how and what VMD features can benefit your IP surveillance application.
First he outlines the features of VMD that you should understand:
Next he talks about understanding what you want achieve from your surveillance system.
Identify what can move:
Then establish what “items of interest” you have that are “typically stationary and should not be moved” such as:
For background on the history of video motion detection in surveillance systems I suggest reading “Digital Video Motion Detection” by Charlie Pierce. It’s interesting to see that while this technology has been around for 25-30 years in analog/CCTV systems, there were many hurdles to overcome.
Namely, false alarms were very prevelant. Recognizing all the bugs that had to be worked out gives me an appreciation and better understanding of how today’s advanced VMD functions work.
More importantly, the advanced algorithms at play here allow you to be creative and imaginative in what you ask of your IP surveillance system.
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