User`s manual

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BLC: Back Light Compensation; image EV (Exposure Value) can be increased
to compensate for background lighting
WDR: Wide Dynamic Range; used for high contrast lighting; some camera
models only have Medium and High setting
Noise Reduction: image noise compensation; manual allows user to define
level of noise reduction (0 none; 255 max).
While noise reduction will smooth pixilation (usually in dark areas), too much
may result in blurring.
3.13 Video/Audio Text Overlay
The video display format can be changed by selecting one of the available
timestamp formats and enabling display of the camera name.
3.14 Video/Audio Privacy Mask
Privacy mask can be used to block out areas from view and triggering motion
detection. Up to 5 privacy masks can be applied; each mask can be 80 x 45 in size.