Bosch NBN-921 User Manual

DinionHD 720p IP Camera

Advanced Mode | en

Bosch Security Systems

Installation and Operation Manual

AR18-10-B013 | v1.52 | 2011.06

Activate this function if tampering associated with exposure to 

extreme light (for instance, shining a flashlight directly on the 

objective) should trigger an alarm. The average brightness of 

the scene provides a basis for recognition.

Activate this function if tampering associated with covering the 

objective (for instance, by spraying paint on it) should trigger 

an alarm. The average brightness of the scene provides a basis 

for recognition.

Activate this function if tampering associated with EMC 

interference (noisy scene as the result of a strong interference 

signal in the vicinity of the video lines) should trigger an alarm.

Save a reference image that can be continuously compared with 

the current video image. If the current video image in the 

marked areas differs from the reference image, an alarm is 

triggered. This detects tampering that would otherwise not be 

detected, for example, if the camera is turned.

1.

Click Reference to save the currently visible video- image 

as a reference.

2.

Click Select Area and select the areas in the reference 

image that are to be monitored.

3.

Check the box Reference check to activate the on-going 

check. The stored reference image is displayed in black 

and white below the current video image, and the selected 

areas are marked in yellow.

4.

Select the Disappearing edges or Appearing edges option 

to specify the reference check once again.

The area selected in the reference image should contain a 

prominent structure. If this structure is concealed or moved, 

the reference check triggers an alarm. If the selected area is too 

homogenous, so that concealing and moving the structure