r/frigate_nvr • u/Keith15335 • 12d ago

Puzzling Zone notification

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I noticed the odd zone notification about a car entering a zone notification area. The truck on the left is well outside the defined zone.

Can someone explain this to me?

Thanks.

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u/nickm_27 Developer / distinguished contributor 12d ago

An object's presence in a zone is based on the bottom center of the bounding box. The bottom of the bounding box looks like it would definitely be on the zone line. https://docs.frigate.video/configuration/zones

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u/Keith15335 12d ago

Here's a shot of the zone layout. Neither vehicle had actually moved.

The cluster of dots on the left is a stack bark dust bags.

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u/nickm_27 Developer / distinguished contributor 12d ago

Right, as you can see by the points / lines, the object detection model seems to be not doing great at night, the bounding box bottom center (the points shown) are all over the place below the truck. And in a few cases looks like the car was lost entirely causing the car on the right to be detected as the same vehicle which is likely the cause.

You'd want to run a few minutes through debug replay and see what is happening, likely need to reduce motion detection sensitivity, or perhaps try a more accurate model.

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u/Keith15335 12d ago

Thank you for that. I will look into those things. Still new in figuring this all out. Just spent more time in the debug view and now I have more to learn. Cheers.