Scene change alert triggers

C

cramsden

n3wb
Dec 12, 2021
5
0
Hi all

I've been running Blue Iris for around a year with Codeproject.ai, it seems to work fine, but I do get the odd nuance that I'm trying to sort out.

I've got the cameras to run on a schedule, so they only trigger and alert after 2200 and before 0600 the next morning.

However, if a cat or whatever comes into the garden and triggers our PIR floodlight, I get a critical alert on my phone saying that a car has been detected, even though the car has not moved for hours. Obviously, this is an annoyance at 0300 as it wakes us up, for what is an obvious false positive.

I can only conclude that when the PIR floodlight fires, it causes the camera to switch from nighttime IR to daytime colour, so that the scene change is that significant and causes BI to freak out and think a car has just arrived!

I sometimes also get a similar alert for person, as the seats in my car are red and contrast against the dark interior of the car, again when the floodlight triggers, a lovely 0300 wake up alert that a person has arrived.

Does anyone know how to mitigate this?

I'm happy to post config screen shots once I know where to look.

Thank you in advance.
 
The AI is simply looking and comparing static images, so we have seen many posts here of a parked car triggering alerts just based on how every car that drives by shines headlights onto the car differently.

You need to increase the make time on the camera so that it isn't triggered as easily.

Or just leave the floodlight on all night LOL. Many here are not fans of floodlights as they can momentarily blind the camera if you haven't spent a lot of time dialing in the shutter and other settings.
 
wittaj said:
The AI is simply looking and comparing static images, so we have seen many posts here of a parked car triggering alerts just based on how every car that drives by shines headlights onto the car differently.

You need to increase the make time on the camera so that it isn't triggered as easily.

Or just leave the floodlight on all night LOL. Many here are not fans of floodlights as they can momentarily blind the camera if you haven't spent a lot of time dialing in the shutter and other settings.
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Thank you.

I think I have this set up already, could you please take a look at my settings (attached) and see if they are correct. If they are, I may consider either disabling the floodlights or leaving them on at night.
 

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Those seem reasonable.

What is your make time to trigger?

I think leaving the light on all night is the best option!
 
Yep that is it.

Make the min object size about the size (but slightly smaller) of what you want to be triggered on - yours is small and anything could trigger that.

You have a make time of 0.5 seconds - only superman gets thru that field of view that fast. Make it 1 second, maybe 2 and that may knock out the false triggers.
 
Thank you, I've changed the object size to 500, but this is difficult to figure out how big it needs to be as the distance from camera to gate is about 20 meters, so a person near the gate would be much smaller than where the car is. I've also changed the make time to 2 seconds. I'll let it run for a few days and post back as it might help someone else if it works.
 
The biggest mistake people make is trying to do too much with one camera and field of view.

Setting up that field of view to trigger on 20 meters and 3 meters will mean the occasional false trigger of something up close.

It comes down to balancing your goals and needs and if the occasional false trigger is an acceptable outcome.

I have two cameras for that field of view - one for the up close and a varifocal for the further distance and that eliminates the false triggers for me.
 
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