Extend Alarm Frame Count - explanation?

[Jamo]

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

[knight-of-ni]

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

[Jamo]

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