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3.8 Privacy zone
In the "Privacy” menu, press the "left" "right" to select "On".
At this point the image will open the Privacy masking. Then, click
"OK" to enter "privacy" setting sub-menu, you can mask the scope
of privacy and sensitivity settings.
Up, down, left and right set
Press the "left" and "right" key to set the level and width of
the fixed detection zone,
When the setup is complete, press the "up" and "down" key to
move the cursor to the "Back". Then, click "OK" button to return
to the implementation for the appropriate functions.