After you install a dash cam and enable AI Event Detection, Samsara CM3x dash cams automatically calibrate and detect the vanishing point (the point where the center of the lane and the horizon line meet). The camera requires a 30 min calibration period at speeds greater than 45 mph. If you need to trigger events before calibration is complete, you can Manually Configure Calibration for the vanishing point.
During calibration, the dash cam uses the default lane positions and assumes that the camera position is perfectly centered on the lane and horizon. To verify the dash cam position, Test Dash Cam Positioning.
After calibration, the camera can accurately detect safety events such as unsafe Following Distance and raise Forward Collision Warnings using Samsara AI detection. If either detection type is enabled and an event is detected before calibration is complete, the vehicle receives an in-cab audio alert and the event is automatically marked with a Dismissed status (Safety > Safety Inbox > Dismissed) in the Samsara dashboard.
To adjust the camera height or to perform the camera calibration manually, see Camera Calibration.
The dash cam automatically determines the vanishing point and the camera height based on vehicle type. If you need to adjust the camera height, you can manually adjust this setting on a per-vehicle basis or when you Enable and Configure AI Event Detection.
To manually configure the vanishing point:
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Select the Settings icon (
) at the bottom of your Fleet menu to view dashboard settings. -
From Fleet settings, select Safety > Event Detection.
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Within AI Event Detection, click Camera Calibration Settings.
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If desired, use the search to quickly locate a dash cam by device name, or narrow the scope of the result with tags or Filter by Camera Configuration (Unconfigured or User Configured).
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On the image thumbnail, select the more actions menu (...) > Edit.
The crosshairs turn from green to blue during editing.
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Click the location where the center of the lane and the horizon line meet to set the vanishing point. For example:
The vanishing point saves automatically.
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To improve the accuracy of detection, Samsara recommends that you reset the calibration (select the more actions menu (( ... ) > Reset) after you calibrate manually to ensure the camera calibrates automatically every two weeks.
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