User`s manual

30 Piranha HS 4x User’s Manual
03-32-10040-03 PRELIMINARY DALSA Corp.
Returning Calibration Results and Errors
After calibration, you can retrieve the results using the command dpc. This function
returns all the pixel coefficients in the order FPN, PRNU, FPN, PRNU… The camera also
returns the pixel number with each coefficient.
To set a range for the returned coefficients provide an optional pixel start and end value:
Example: display pixel coefficient from pixel 10 to 20
dpc 10 20
The command gcp returns all other settings.
3.11.1 Analog and Digital Processing Chain
The figure below is a simplified block diagram of the camera's processing chain. The
analog processing chain contains two elements–a gain stage and an offset stage. The
digital processing chain contains the FPN correction, PRNU correction, background
subtract, and a system gain stage. The software commands allow you to set and change all
the elements of the processing chain. This enables maximum processing flexibility
depending on your requirements.
Figure 11: Signal Processing Chain
Analo
g
Processin
g
Digital Processing
analog video
analog
gain
analog
offset
FPN
coefficients
digital
offset
PRNU
coefficients
background
subtract
system
gain
di
g
ital vide
o
sg
sao
ccf
sdo
ccp
ssb
ssg
short form commands
Analog Signal Processing
Optimizing offset performance and gain in the analog domain allows you to achieve a
better signal-to-noise ratio (dynamic range) than you would achieve by trying to optimize
the gain and offset in the digital domain. As a result, perform all analog adjustments prior
to any digital adjustments.