HIKVISION DS-8004HCI-S User Manual page 88

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Once you have the area(s) defined, press [EDIT] to accept, or [ESC] to cancel.
Saving the masked area:
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In "Camera Input Adjustment" menu, press the "Confirm" button to save the mask area,
or press "Cancel" to abort.
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You can repeat steps listed above to setup mask areas for other cameras.
Example of mask area function (blacked out area over the camera image).
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