Draw a zone
Create a normalized rectangle on the video overlay. The region survives resize and reloads.
Computer vision for virtual perimeters
Monitor people entering a custom zone
Draw a square directly on the camera feed, detect people with Workers AI, and log entry or exit events when detections overlap that area.
DETR + browser geometry in-memory event log
Open the zone monitor Virtual perimeter analytics
Draw a zone, log entries
Idle
Start the camera, then draw a monitored square over the video.
Only person detections inside the zone create events.In zone now0
People detected0
Total events0
Zone coverage-
Longest dwell-
Latency-
From detection to events
This view turns object detection boxes into zone occupancy analytics without adding any server-side state.
Detect people
DETR runs on sampled frames and returns person bounding boxes with confidence scores.
Log transitions
The browser logs entry, exit, and clear events when people cross the virtual perimeter.