IPC-Color4M-T: got a false positive with IVS, what should i tweak?

P

pol

n3wb
Jan 15, 2025
16
4
Italy
Hello all,
I have some IPC-Color4M-T configured with: MD/SMD off, AcuPick off, IVS on, large scale ai models on. For IVS, I have just a basic intrusion rule with appear/cross for human and/or vehicle. Up until yesterday night, everything has been working beautifully. I have some cats running around and some big birds/whatever I don't even know the Italian name let alone the English one :rofl:
I never had a false positive in the past ~1.5 months (when I started using IVS) but yesterday night this cat triggered the "intrusion alert". I wonder why it happened and what I can tune what setting to avoid this from happening again.

The cat came running from the bottom of the frame to the top. Maybe because it was running/jumping fast it thought it was a human?

I'm using the latest NVR and camera firmware available from Andy's website. AI is by camera.

Thanks
 

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Turn OFF large scale models and reboot the camera.
Go back and double check it is OFF
 
AI mumbo jumbo that in theory is better more precise detection at further distances and can detect various animals by type.

So if you have a problem with Giraffes in your backyard it may be beneficial to keeping it on.

I suspect it picks up birds too :idk:
 
I have disabled the large scale models. But still get the human intrusion when this cat appears.
It was walking slowly and video is very clear. No streaks or else.

Any idea what I could tweak?
 

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pol said:
I have disabled the large scale models. But still get the human intrusion when this cat appears.
It was walking slowly and video is very clear. No streaks or else.

Any idea what I could tweak?
Click to expand...
I have the same issue in older camera, there is specific cat that trigger many false positives (cat detected as a human).
I think that the issue occurs more in cameras that are mounted high.
I don't have a fix for this issue.
 
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The global config you mean sensitivity? I only have ai large scale models on/off and sensitivity in the global config
Then in the rule itself I have sensitivity again.

I wanted to set a min size, but I'm unsure how to proceed.

1) where should I draw the box? Because the cat is obviously bigger close to the camera than it is from far away. To give an idea, the first camera from the first post is 6mt from the entry door

2) in the page after the min/max draw, there's also an "ai rule" button that can be toggled on/off. What's that?
 
Global config is where you measure the length of an object in several locations of the field of view to "calibrate" the camera to object sizes for your field of view.

As far as min size, where you draw the box is irrelevant. As you point out the size you make it does impact the size of an object based on proximity to camera. Have you noticed a particular spot where it triggers the camera?
 
d5775927 said:
I have the same issue in older camera, there is specific cat that trigger many false positives (cat detected as a human).
I think that the issue occurs more in cameras that are mounted high.
I don't have a fix for this issue.
Click to expand...

Some cats are actually disguised humans, nothing you can do
 
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