the lower third of the image solved this problem. The window in the upper half of
the image thus has no effect on the exposure measurement, effectively eliminating
the backlight.
5.7.4 Automatic Exposure Setting Parameters
Setup Menu > Exposure Setting contains the following parameters that are rele-
vant for exposure control. They can be set individually for the right and the left
image sensor (if present).
• Automatic Contrast: If set to
Auto
(factory default), this parameter will auto-
matically enhance contrast to avoid "flat" images.
• Brightness: This parameter adjusts the image brightness.
• Backlight Correction: This parameter improves images that contain bright
and/or overexposed areas. A typical example would be a scene where a
bright window is the main source of light. Objects located in front of it are
displayed too dark and with too little detail.
Increasing the default value of
4
will increase overall illumination to properly
display the dark image areas. This parameter offers the most advantages for
high-contrast night images (see section 5.8,
Day & Night Modes
).
5.7.5 Exposure Setting Options
In addition to the parameters of the automatic features, the following image
enhancement options are available:
• Night Improvement: This parameter improves dark images (night images in
particular, also see section 5.8,
Day & Night Modes
).
• Exposure Window: This parameter allows setting the positions of the expo-
sure windows used by the automatic exposure control to determine expo-
sure time and brightness.
The
Extra
option allows configuring customized exposure windows (see sec-
tion 5.7.6,
Exposure Windows
).
If you set the Show Window option to
On
, the exposure windows are dis-
played in the camera's live image (green and red frames).
See further below for more information on adjusting the exposure windows
and on white balance.
• Max. Exposure Time: This parameter sets the longest exposure time to be
used by the camera. This parameter is extremely important since it is has to
provide for crisp images (short exposure time) on the one hand and for prop-
erly exposed noise-free night images (long exposure time) on the other
hand.
For moving objects, it is recommended to use a minimum exposure time of
1/60 second. For still (non-moving) objects, a maximum exposure time of 1
second makes sense (64 times higher amount of light as compared to 1/60
second).
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com • 10.10.2006
124/288
Software Camera Manual Part 2
If possible, keep the
factory default settings
for the automatic
contrast and brightness
settings. For night images,
you may set backlight
correction to a value of
7 or 8
Exposure control can be
adapted to the most
difficult lighting
conditions
To Next Page
Loading...
