Piranha 3 User Manual
Teledyne DALSA
03-032-10216-06
45
Setting Digital Offset
Pu rp ose:
Sets the d igital offset. Digital offset is set to zero w hen you
p erform FPN correction (
ccf
com m and ). If you are u nable to
p erform FPN correction, you can p artially rem ove FPN by
ad ju sting the d igital offset.
Syntax:
sdo
t i
Syntax Elem ents:
t
Tap selection. Allow able range is
1
to
8
, or
0
for all tap s.
i
Su btracted offset valu e in a range from
0
to
2048
w here
FPN Coefficient= (12 bit LSB Justified)
i
N otes:
When su btracting a d igital valu e from the d igital vid eo
signal, the ou tp u t can no longer reach its m axim u m u nless
you ap p ly d igital gain u sing the
ssg
com m and . See the
p reviou s section for d etails on the
ssg
com m and .
Related Com m and s:
ssg
Exam p le:
sdo 0 100
PRNU Correction
Performing PRNU Correction to a Camera Calculated Value
Pu rp ose:
Perform s PRN U correction and elim inates the d ifference in
resp onsivity betw een the m ost and least sensitive p ixel cr eating a
u niform resp onse to light.
Syntax
ccp
N otes:
Perform all analog ad ju stm ents before calcu lating PRN U.
Perform FPN correction before PRN U correction.
If FPN cannot be calibrated , u se the
rpc
com m and to reset
all coefficients to zero, and save them to m em ory w ith the
wfc
com m and . You can then ad ju st the d igital offset (
sdo
com m and ) to rem ove som e of the FPN .
Ensu re cam era is op erating at its exp ected analog gain,
integration tim e, and tem p eratu re.
Refer to Calibrating the Cam era to Rem ove N on -
Uniform ity (Flat Field Correction)on p age 35 for a
p roced u ral overview on p erform ing flat field correction.
Related Com m and s:
ccf
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