Hikvision 16-ch 1.5U 4K NVR : Configuration Guide : Page 8

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2) Obstacle

If there’re obstacles in front of the camera, there will be c false alarms which occupy

NVR smart resources. In addition, large obstacle might block target you are really

interested in. Scene in picture below is not an appropriate one for detecting.

3) Strong light

In some scenarios, strong light interference makes a target hard to be detected.

Strong light generally can be divided into two kinds: strong background light and

strong foreground light.

Strong background light makes foreground target totally dark, as what is shown

picture below, the man in corridor looks like a shadow. WDR or BLC function is

recommended in this scene.