Firmware User Manual
61
Slowest Auto Shutter Speed is the user defined threshold for slowest allowed speed of auto shutter. For
example, if by default the shutter speed would vary between 1/5s ~ 1/2000s depending on the lighting
conditions, then setting the Slowest Auto Shutter Speed to 1/30s would narrow down the auto shutter
range to work between 1/30s ~ 1/2000s. The purpose of allowing user to define the threshold for slowest
speed is to avoid motion blur caused by too slow shutter at night.
It is also important to know that very high shutter speed is not recommended for indoor solutions with
artificial light that flashes with certain frequency, as it may produce flickering effect, regardless of
Exposure mode.
Shutter speed choices according to environment:
In extreme low light conditions, the shutter speed is slown down to get more light into one image, but
not slower than the user defined threshold.
If the exposure time extends beyond the interval between frames (too slow shutter), (i.e. 1/30 second),
then the frame rate will be automatically reduced. Longer time in this value gives clearer images at night
for slow moving objects, but more motion blur for fast moving objects.
White balance refers to the capability of the camera to understand what “true white color is”. When the
camera knows the true white color, then the rest of the colors will be accurate, too. While human eye can
easily adapt to different lighting sources (even mixed sources, such as sun light through the window and
indoor lights turned on at the same time), the camera has to understand what is the dominant light
source in given scene and what is the “white color” of such light source.
By default the camera is in auto white balance mode and attempts to recognize the light source and its
color spectrum automatically and adjusts the image accordingly. This function works continuously in the
background. It is re-evaluated for each frame, to make sure if there is any change in dominant light
source (e.g. the user closes the curtains to block the sun light and turns on the indoor lights).
In most cases the auto white balance works perfectly and the user does not have to adjust anything! In
some rare installation cases, especially when there are no white color objects in the field of view, and the
light sources are mixed, the camera may have difficulty to identify the true white color to fine tune the
(101 Seiten)
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