[Detector Support]: Help with consistent false positive in one area

[templeowls21]

Describe the problem you are having

I'm getting false positive 'person' detection alerts for one specific area of my yard consistently. See below for the latest example:

It's a mulch bed so I have that area object masked (see below), but it's still throwing out false positives. Some of the area in the red box above is my driveway which I don't want object masked.

Any suggestions on how to fine tune my config to avoid these?

Thanks!

Version

0.15.0-e76f4e9

Frigate config file

mqtt:
  host: 192.168.107.2
  port: 1883
  user: user
  password: password
  topic_prefix: frigate

go2rtc:
  streams:
    Driveway:
      - rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=0
    Driveway_sub:
      - rtsp://admin:[email protected]:554/cam/realmonitor?channel=1&subtype=1
  webrtc:
    candidates:
      - 192.168.107.3:8555
      - stun:8555

detectors:
  coral:
    type: edgetpu
    device: usb

cameras:
  Driveway:
    ui:
      order: 2
    ffmpeg:
      inputs:
        - path: rtsp://127.0.0.1:8554/Driveway
          input_args: preset-rtsp-restream
          roles:
            - record
        - path: rtsp://127.0.0.1:8554/Driveway_sub
          input_args: preset-rtsp-restream
          roles:
            - detect
    detect:
      enabled: true
      width: 704
      height: 480
      fps: 10
    record:
      enabled: true
      retain:
        days: 7
      alerts:
        retain:
          days: 30
      detections:
        retain:
          days: 30
    objects:
      track:
        - person
      mask:
        - 0.192,0.595,0.795,0.662,1,1,0.001,0.996,0.004,0.703
        - 0.965,0.692,0.911,0.659,0.692,0.382,0.788,0.327,0.859,0.325,0.93,0.363,0.99,0.44,0.999,0.512
version: 0.15-0

docker-compose file or Docker CLI command

n/a

Relevant Frigate log output

n/a

Install method

Docker Compose

Object Detector

Coral

Screenshots of the Frigate UI's System metrics pages

n/a

Any other information that may be helpful

Please note...my config above is only for the one camera. I have 10 cameras so I removed all that code for simplicity sake

[hawkeye217]

Presence of an object is evaluated based on the bottom center of the bounding box for the object. It does not matter how much of the bounding box overlaps with the zone or mask.

See the docs: https://docs.frigate.video/configuration/zones/

Your object's bounding box bottom center looks like it's just outside your object mask.

[templeowls21]

Gotcha, I can work on that. Thanks.

But also, I am getting a lot of false positives outside of any masks. For instance, I live in northcountry so I get a lot of snow. And it will trigger a person, dog, etc detection off just snow on the ground. Is there any way to kind of teach it to reject these false positives?

[hawkeye217]

There are a number of ways to reduce false positives: https://docs.frigate.video/configuration/object_filters/

A tuned Frigate+ model would also be another way.

[templeowls21]

This is very helpful. Thanks!