Alert Sensitivity
Overview
Alert Sensitivity controls how much of a detected subject needs to enter your defined Region of Interest (ROI) before an alert is triggered.
Behind the scenes, Coram's system uses a bounding box to represent each detected subject. This is a rectangle that surrounds the entire person or vehicle. When an alert zone is defined, Coram triggers alerts based on how much of the the bounding box overlaps with the Alert ROI.
A diagram that broadly demonstrates the effect of different sensitivity settings on alert triggers, with a defined region of interest.
A diagram that broadly demonstrates the effect of different sensitivity settings on alert triggers, without a defined region of interest.
Your chosen sensitivity setting determines how much overlap is required to trigger an alert:
High sensitivity: Triggers an alert even if only a small part of the bounding box enters the zone. This is useful for fast-moving subjects or very small ROIs.
Medium sensitivity (default): Requires a moderate amount of overlap to trigger. This works well in most typical use cases.
Low sensitivity: Requires most or all of the bounding box to be inside the ROI before triggering. This reduces false positives from objects near the edge of the zone.
When to Adjust Sensitivity
Stick with Medium for general use unless you see a clear need to adjust.
Use High if people or vehicles are moving quickly through small zones, and alerts are being missed.
Use Low if alerts are being triggered too often by people or vehicles near — but not fully inside — the zone.
Example
Say you’ve defined a narrow alleyway as your ROI. A person quickly passes through, and only part of their bounding box enters the zone:
With High, an alert will likely trigger.
With Low, the system may ignore it unless most of the person enters fully.
How to Change Alert Sensitivity
Sign into the Coram web app.
In the main navigation menu, click Alerts.
Go to the Manage tab.
Click the alert you want to edit.
In the Edit Alert drawer, find Alert Sensitivity.
Choose Low, Medium or High sensitivity.