Zones Issue

[stamandr]

How do I stop detecting cars ( top of car picture ). I understand that with zones you can specify the area for detection and the objects. I keep picking up cars passing by on the road. Am I missing something ? Thanks in advance....

I have the following in my config

snapshots:
    required_zones:
      -driveway_only
zones:
driveway_only:
        coordinates: 398,38,450,292,704,302,704,480,0,480,0,233,190,40
        objects:
          - car

[blakeblackshear]

Zones are evaluated based on the bottom center of the bounding box, so the white van will be inside the defined zone each time it is detected. Cars driving on the street will trigger detection and cause the van to be detected again. I would define a zone from the middle of the driveway up to where the zone ends currently.

[stamandr]

Do I keep the other zone as well ?

[blakeblackshear]

Something like this

[stamandr]

Do I keep the other zone as well ?

[blakeblackshear]

Based on what you described, I don't see a reason for the other zone.

[stamandr]

I've removed the driveway_only zone. Now to test....
I would like to expand the zone further to the road to pick up cars for example crossing into the driveway. But I will test with what I have right now

[stamandr]

This proving to be more difficult than I thought. Every time a car goes by on the road the Van is pickup up in bounding box. I pretty much have to exclude half of the driveway on the right side to not pick it up. Is there a way to limit the area bounding box picks up ?

[blakeblackshear]

What is your detect resolution?

[stamandr]

  width: 704
  height: 480

[stamandr]

Any luck with playing with the zones ?

[blakeblackshear]

I haven't had much time to work on it yet. I have been swamped with work and other things this week.

[stamandr]

No worries.... Take you time. Thanks....

[rlrl]

i am also playing around doing something like this as well. i notice sometimes when cars drive by frigate doesn't detect they're in the zone that's the street in front of my house.

[R5fan]

Similar issue. This car was detected as on my driveway:

Despite my driveway being defined by the brown area:

(it extends down further because people tend to take shortcuts over my lawn. I know I can fix that for cars)
And despite a generous motion mask:

Im guessing the object detection ignores the motion mask, so if there is any motion caused by shadows in the "driveway" zone, it will detect cars that are "motion masked" if only a few pixels of the bounding box of the car are in the zone? If I where to create an object mask for cars on the street, would it also ignore that mask if the bottom of the car bounding box gets outside that masked zone?

If so, Im thinking it might be useful to actually mask areas completely, feed the coral black pixels so to speak, so it cant detect whats being masked.

[blakeblackshear]

Im guessing the object detection ignores the motion mask, so if there is any motion caused by shadows in the "driveway" zone, it will detect cars that are "motion masked" if only a few pixels of the bounding box of the car are in the zone?

Yep. See here for more info: https://docs.frigate.video/configuration/masks#further-clarification

I suggest adjusting your zone (or creating a car specific zone) so when the bounding box occasionally includes a part of the tree and road, they don't enter the zone. You can probably just move that bottom right corner. Another option would be to define an object filter mask for cars over your yard. Just remember that zones are based on the bottom center of the bounding box, so don't get it too close the driveway or road.