Scene too bright, Scene too dark | Bosch Appliances NDN-921 guide

FlexiDomeHD 720p IP Camera	Advanced Mode en 89

Scene too bright

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.

Scene too dark

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.

Scene too noisy

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.

Reference check

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.

Disappearing edges

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

Bosch Security Systems

Installation and Operation Manual AR18-10-B013 v1.52 2011.06

NDN-921 specifications

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