Extend Alarm Frame Count - explanation?

Forum for questions and support relating to the 1.28.x releases only.
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Jamo
Posts: 15
Joined: Tue Aug 13, 2013 6:25 am

Extend Alarm Frame Count - explanation?

Post by Jamo » Fri Nov 07, 2014 1:33 am

Hi

Can anyone tell me the purpose of the above field - "Extend Alarm Frame Count" in the zone setup? It is the first time I've noticed it - not sure if it was introduced in 1.27 or 1.28.

Just curious and hoping to understand more for configuring my zones.

thanks for the great software.

James

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knight-of-ni
Posts: 2244
Joined: Thu Oct 18, 2007 1:55 pm
Location: Shiloh, IL

Re: Extend Alarm Frame Count - explanation?

Post by knight-of-ni » Fri Nov 07, 2014 4:35 pm

That field is for Preclusive Zones only.

What it does is allow you to keep the Preclusive Zone active longer than just 1 frame.

Here is how the original author describes it:
Here's the problem I'm trying to solve: After sudden change in lighting, my cameras tak a few moments to adjust auto-exposure. Combined with gradual image blending, I end up with a slowly shrinking alarmed area that will result in a false alarm.
I can easily define a preclusive zone that will trigger on the change in lighting, but I need to keep the preclusive alarm active for a couple of frames to avoid the false alarms.
You can read all the details here:
https://github.com/ZoneMinder/ZoneMinder/pull/338
Visit my blog for ZoneMinder related projects using the Raspberry Pi, Orange Pi, Odroid, and the ESP8266
All of these can be found at https://zoneminder.blogspot.com/

Jamo
Posts: 15
Joined: Tue Aug 13, 2013 6:25 am

Re: Extend Alarm Frame Count - explanation?

Post by Jamo » Wed Nov 26, 2014 11:52 am

Awesome, thank you for the feedback - that could prove useful to me in tuning my motion detection.

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