It is important to exclude from the image area any areas where you do not want motion detection to trigger recording.
Editing motion detection masks
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Go to System Manager > VMS Servers > Cameras > Motion Detection
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Select a camera from the list
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Verify that the motion detection method is set to Adaptive Detection
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Select Mask 1
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Select Eraser
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Remove any areas from the image region that you do not want to trigger recording. Movement within the marked area will be recorded if the motion detection threshold is exceeded.