User Manual
Wildcat
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–
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Date:
XF-104_03/20-12-2012
Page 45 of 58
The next step corrects for Photo(n)-Response Non-Uniformity (PRNU) which is caused by
differences in individual pixel gain. For this step, the camera needs to be placed in front of a
uniformly lit scene. It is recommended the light intensity be around 2/3 the dynamic range of
the camera response, which corresponds to a raw ADU value of around 50.000 ADU for the
Wildcat camera.
We recommend again using a bad pixel threshold of 350% for both the
Photon response non
uniformity
and
Temporal noise
settings in the
Bad pixel criteria
section for a Wildcat camera.
The
Post processing
section provides additional options for adjusting the gain and offset. For
the Wildcat camera it is recommended to set
Mode
to
Dynamic range
. The
Black clip, White
clip
and
Dynamic range
settings function as described in Chapter 7.2.1. Good clipping values
for a Wildcat are around 32.000 for
Black clip
and around 60.000 for
White clip
, with
Dynamic
Range
set to
Sensor.
Press the
Perform capture and analysis
button to proceed. The wizard will again grab the
required frames with the camera and apply its correction algorithms. As with the dark image
some basic bad pixel info will be displayed under
Results
– Info
, and the bad pixels will be
marked in the X-View pane with their corresponding color codes. Bad pixels from the dark
image step will also be shown so the entire bad pixel map is visible.
If you are satisfied with the calibration result, select
Finish
and save the calibration to disk. It
can then be loaded as software calibration in Xeneth or uploaded to the camera.
