Kamera Werk Dresden CMOS - Manual (Page 20)

Version 1.08 (04/07) Manual: CMOS Industrial Camera LOGLUX
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i5
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Page 20 of 46 KAMERA WERK DRESDEN GmbH
The ‚Exposure‘ profile menu
The conversion function of the camera in the central shutter mode is set in this menu; this means most
of the settings will not be available until the 'Synchronous shutter (snapshot)' mode is activated in the
'Sensor' profile menu.
For a reasonable and fast selection of the options in this menu, the respective chapter in the camera
manual (The dynamic (contrast) range of the IBIS5 sensor) is recommended to be thoroughly read.
With 'Exposure precalculation' and 'Manual
exposure configuration' the user is given two
independent possibilities of adjusting the
conversion characteristic of the camera sensor.
First the integration time base must be set
under 'Exposure precalculation', with the
choice being between the current integration
time or a new total integration time ('User') or
the maximum time possible under the current
auto trigger rate ('Trigger'). When selecting
'User' the user must give the 'Total time' in ms.
Then, by means of two functions (logarithm of
base x, root of base x), the user can
approximate the sensor conversion function for
up to another three integration times to choose
from. To this end, the user highlights under
'Mode' the desired conversion function to be
approximated, and enters the value of the base
of the conversion function to be approximated
under 'Scale' . Finally, the accuracy of the
conversion function approximation is defined
by selecting the number of integration steps in
the 'Slopes' box. All settings are activated by
clicking button 'Apply'.
Under 'Manual exposure configuration' the user
is given the possibility to define the shape of
the
sensor conversion characteristic by
entering the integration time number and value
of up to three more integration steps. .Entering
a valid integration time in 'Last slope' - this is
absolutely necessary if the above option is not
made use of - results in an exposure at a single
integration time ('single integration slope'). By
entering more valid integration times, exposure
at up to four successive integration times can
be implemented. Below the 'Last slope' input
field are displayed the total exposure time and
the frame rate which depends on the camera configuration in the currently used profile. The value
shown in the figure can be considered a good value.
The raw (i.e. not pre-processed) sensor greyscale value versus object light intensity diagram gives a
survey of the sensor conversion function in the individual integration steps.
Figure 16 : The ‚Exposure‘ profile menu