The task at hand determines which exposure control strategy to use. If you would
like to capture images of individuals in the other room, you should use a vertical
exposure window in the center (third image). If you would like to capture the faces
of persons entering the room, these faces will receive the same amount of light as
the room itself. In this case, the exposure windows to the left and right of the door
(second image) would produce the best results. Even if the other room would be
dark and a person would point a flashlight into the camera, the camera would not
produce an overexposed (and thus, unusable) image, as the flashlight would not
influence the exposure windows.
Use the pull-down menus in the live image to select the exposure windows.
5.7.7 Setting the Exposure Windows
Setup Menu > Exposure Settings contains a number of predefined exposure
windows. Also, the areas within the exposure windows can be weighted against
the areas outside of these windows using a separate parameter.
First, the automatic exposure feature determines the possible settings inside and
outside of the exposure windows. Next, it evaluates the exposure according to the
value set for Exposure
Weighting (
0% to 100%
). If you select the
Total
option for the
Exposure
Weighting parameter, the entire image is used for exposure control, dis-
regarding the exposure windows. You may also use the exposure windows for
automatic white balance adjustment (see section 5.7.2,
Automatic Exposure
).
For testing purposes, it is recommended to temporarily display the exposure win-
dows in the live image. If you set the Show
Window option to
On
for the respective
lens, the exposure windows are displayed by green frames in the camera's live
image.
Exposure Window Parameters
The following exposure window parameters are only needed for adjustments in
difficult situations. It is recommended to change these parameters only if other
measures have not led to the desired results.
• Exposure
Weighting: This parameter defines the weight (0% to 100%) that
the exposure windows have for controlling exposure in relation to the rest of
the image. The factory default setting of
100%
means that only the exposure
windows are used for exposure control.
Setting the weighting to
Total
will use the whole image area for exposure
control, thus ignoring the exposure windows. This setting is useful if the
exposure windows are to be used only for automatic white balance.
• White
Balance
Weighting: This parameter defines the weight (0% to 100%)
that the exposure windows have for controlling white balance as compared
to the rest of the image.
Setting the weighting to
Total
(factory default) will use the whole image area
for white balance, thus ignoring the exposure windows. This setting is useful
if the exposure windows are to be used only for automatic exposure.
© MOBOTIX AG • Security-Vision-Systems • Made in Germany
www.mobotix.com • sales@mobotix.com • 10.10.2006
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Software Camera Manual Part 2
Flexible possibilities for
adapting exposure control
to the current situation
If possible, keep the
factory default settings
for exposure weighting,
white balance weighting
and average brightness
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