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72
USER MANUAL
quality will be achieved with megapixel lenses. The auto-iris lenses available
on the market today are not megapixel and will yield the images that are
less crisp than those that can be obtained with manual megapixel lens.
12 . What a djustments can be made t o reduce the mot i on blur?
The shutter speed is automatically controlled by the camera. The motion
blur may occur when the camera operates slow shutter speeds (long
exposure times). This may happen when the scene is relatively dark. MP
cameras provide a number of options that allow the user to control auto-
exposure behavior when the illumination is low.
The user can set the preferred exposure time that the camera will attempt
to maintain as long as illumination level allows. This setting essentially
allows the user to choose the tradeoff between gains and exposure time
at reduced light levels. There are 3 basic settings: Speed, Balance, and
Quality(
Figure 35
). These settings can be selected from “Low Light Mode”
menu Mode list. Speed setting will result in higher image noise but will
attempt to maintain 10ms exposure time for as long as possible, reducing
motion artifacts. Quality setting will maintain 40 ms exposure time,
resulting in low-noise image with some motion blur in low light. Balanced
setting is in between.
There are also two special modes, High Speed and MoonLight™ that can
be used for very fast moving targets and very low illumination,
respectively. High Speed mode allows the user to specify fixed exposure
time in terms of milliseconds (from 1 to 10). While this will allow crisp
video of fast moving vehicles, the side effect of this setting is that low-
light performance of the camera will be significantly worse (up to 800
times) than in default mode. Therefore, High Speed should only be used
for well lit scenes.
The other special mode, MoonLight™ implements long exposure times (up
to 0.5 seconds) in combination with proprietary noise cancellation
technology. This mode allows viewing under extremely low illumination
conditions. It is important to note, that MoonLight™ is NOT digital frame
integration and will offer significantly better image quality than cameras
that employ digital frame integration. However, the motion blur will still be
significant.
Setting the Low Light Mode to Speed is the first thing to do to eliminate
the motion blur. If that doesn't produce enough improvement, the user
may want to open the lens aperture more to allow more light in. The user
may also want to consider going with the camera equipped with auto-iris
lens - the lens will open automatically as illumination diminishes. If that is
