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The new commands allow to launch background computation of bias and flat correction
files.
When using these commands, the acquisition framerate is not limited, allowing to compute bias/flat for
low fps/long exposure durations.
The number of images to be used for the NUC computation is now specified in the command
parameters and must be in the range [10-256].
Higher number of images increases the quality of the computed NUC correction file, whereas lower
increases the speed of the acquisition/computation.
During the computation of the NUC correction file, the camera enters a specific “busy” state, that only
allows to retrieve the progress of the current computation or to abort it. This is needed to ensure that
camera parameters remain consistent during the acquisition/computation process.
buildnuc bias <nbframes>
Build the bias correction image (asynchronous).
Replaces the
exec buildbias
command.
buildnuc flat <nbframes>
Build the flat correction image (asynchronous)
Replaces the
exec buildflat
command.
buildnuc flat_hdr_c1
<nbframes>
Build the flat correction image to be used in with HDR/C1
Replaces the
exec buildflat hdr_c1
command.
buildnuc flat_hdr_c2
<nbframes>
Build the flat correction image to be used in with HDR/C2
Replaces the
exec buildflat hdr_c2
command.
The estimated remaining time for the computation (in seconds) can be read using the “
buildnuc
progress”
command.
The current computation can be aborted using the
“buildnuc abort”
command.
Adaptive Bias
On uncooled cameras, the sensor temperature varies with the environment temperature. The bias file
initially built will be obsolete if the temperature changes.
To keep a good corrected image whatever the temperature is, the C-RED 3 camera embeds an
automatic system which recalculates the bias file applied according to the sensor’s temperature.
It is not necessary to be in dark conditions to rebuild the bias files because the correction system is
factory calibrated for each camera, and so is fully autonomous.
