American Dynamics VideoEdge User Manual download pdf (Page 285)

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Dark Image Detection

Overview

The NVR can perform a Dark Image Detection test on every camera in the network. You can use

this test to determine if the NVR has a camera that is recording a very dark, or potentially black

video. The test runs for each camera once a minute, it counts the number of pixels with intensity

values less than the Darkness threshold which is defined in the Dark Image Detection page. The

Darkness threshold can be set from 1 (darkest) to 255 (brightest), with a default setting of 80.

For example, with a Darkness threshold setting of 80

, a pi

xel with RGB values of 70, 70, 70 is

considered dark, while a pixel with RGB values of 70, 70, 81 is not considered dark. If 90% of all

pixels are dark (have intensities less than the threshold you have set), then a ‘Video Loss’ alert is

activated.

You can also enable Camera Loss Detection. If th

e came

ra goes offline a ‘Video Loss’ alert is

triggered.

In victor client use the Activity Log page to see

if any cameras have generated any ‘Video Loss’

alert events.

Figure 24-1 Dark Image Detection Page

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