5.8.2 Reduction of Dark Noise
Growing darkness may result in the image quality getting poorer (
dark noise
). The
Noise Suppression
parameter minimizes this effect (Setup Menu > General Image
Settings). The maximum exposure time (Setup Menu > Exposure Settings >
Maximum Exposure Time) also influences dark noise. The shorter your maximum
exposure time is, the earlier you will experience dark noise.
5.8.3 Configuration Hints
In order to obtain high-quality, crisp day and night images it is recommended to set
the maximum exposure time for both lenses to a short value (e.g.
Max 1/60
sec-
ond; Setup Menu > Exposure Settings). For non-moving objects, you can set the
maximum exposure time to a higher value (e.g.
Max 1/1
second). Note that you can
set different values for the two lenses. By factory default, this setting is 1/30 and 1/5
second, respectively.
In addition, you can set the Backlight Correction value for the B/W lens (left) to e.g.
8
(Setup Menu > Exposure Settings). This setting guarantees for high-quality
results in lighting situations with strong contrasts at night (e.g. with street lights pre-
sent).
When setting the Night Improve parameter (Setup Menu > Exposure Settings) to
On
, dark images are further improved. This may, however, result in increased
image noise. It is recommended that you test the Night
Improve and Dark
Noise
Suppress features using different parameters under real conditions.
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com • 10.10.2006
131/288
Software Camera Manual Part 2
Dark noise reduction for
improved image quality in
situations where light is
fading
Note
When using video motion detection at night, make sure that image
noise (individual pixels in the image that change color) does not lead
to unintended triggering of the motion detection windows. Open Setup
Menu > Event Settings and set the Video Motion Night Mode
parameter to a value that disables video motion detection when the
illumination falls below the chosen level. As an alternative, you could
increase the area parameter of all video motion definitions. We
recommend testing this function under real conditions.
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