Piranha HS-xx RoHS User Manual
Teledyne DALSA
03-032-20013-03
89
Mnemonic
Syntax Parameters Description
calcu late PRN U
algorithm
cpa
i1 i2
Perform s PRN U calibration accord ing
to the selected algorithm .
The first p aram eter is the algorithm
w here
i1
is:
1
= This algorithm first ad ju sts each
tap’s analog gain so that 8-13% of pixels
w ithin a tap are above the valu e
sp ecified in the target valu e p aram eter.
PRN U calibration then occu rs u sing the
p eak p ixel in the region of interest.
(Id entical to
ccp
)
2
= Calcu lates the PRN U coefficients
u sing the entered target valu e as show n
below :
PRNU Coefficient =
Target
(AVG Pixel Value) - (FPN+
value)
sdo
The calcu lation is p erform ed for all
sensor p ixels bu t w arnings are only
ap p lied to p ixels in the region of
interest. This algorithm is u sefu l for
achieving u niform ou tp u t across
m u ltip le cam eras.
3
= This algorithm inclu d es an analog
gain ad ju stm ent p rior to PRN U
calibration. Analog gain is first ad ju sted
so that the p eak p ixel valu e in tap ’s ROI
is w ithin 97 to 99% of the sp ecified
target valu e. It then calcu lates the
PRN U coefficients u sing the target
valu e as show n below :
PRNU Coefficient =
Target
(AVG Pixel Value ) - (FPN +
value)
sdo
i
i
i
The calcu lation is p erform ed for all
sensor p ixels bu t w arnings are only
ap p lied to p ixels in the region of
interest. This algorithm is u sefu l for
achieving u niform ou tp u t across
m u ltip le cam eras.
4
= This algorithm is the sam e as 2 w ith
the excep tion that it only calcu lates
PRN U for the p ixels w ithin the cu rrent
Region of Interest (ROI).
The second p aram eter,
i2
, is the target
valu e to u se in a range from
1024
to
4055
DN .
correction set sam p le
css
m
Set nu m ber of line sam p les averaged
for p ixel coefficient calcu lations or for
ou tp u t of
gla
com m and . Valu es:
256
,
512
,
1024
. Factory setting:
1024
Refer to Retu rning Averaged Lines of
Vid eo on p age 76 for d etails.
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