Falcon 4M Camera Manual
03-032-20044-03
Teledyne DALSA
52
3.7.4 Performing FPN Calibration
Calibrating All Camera Pixels
Pu rp ose:
Perform s FPN calibration and elim inates FPN noise by su btracting
aw ay ind ivid u al p ixel d ark cu rrent.
Syntax:
ccf
N otes:
Before p erform ing this com m and , stop all light from entering
the cam era. (Tip : cover lens w ith a lens cap .)
The goal is to su btract all non -u niform ities and offsets in ord er
to obtain a 0DN ou tp u t in the d ark . Analog offset shou ld
therefore be set to 0 since it gets su btracted ou t d u ring CCF.
Set the d igital gain (
ssg
) to X1 since d u ring calibration it gets
forced to X1 (
ssg
0 4096).
Perform FPN correction before PRN U correction.
The
ccf
com m and is not available w hen the cam era is u sing the
factory calibrated coefficients (
csn 0-2
). You m u st select the
u ser coefficient set (
csn 3-5
) before you can p erform FPN
calibration. An error m essage is retu rned if you attem p t to
p erform FPN calibration w hen u sing
csn 0-2
.
Exam p le:
ccf
Calibrating Individual Pixels
Pu rp ose:
Sets an ind ivid ual pixel‘s FPN coefficient.
Syntax
sfc
x y i
Syntax Elem ents:
x
The p ixel colu m n nu m ber from
1
to
2352
.
y
The p ixel row nu m ber from
1
to
1728
.
i
Coefficient valu e in a range from
0
to
1023
.
N otes:
The
sfc
com m and is not available w hen the cam era is u sing
the factory calibrated coefficients (
csn 0-2
). You m u st select
the u ser coefficient set (
csn 3-5
) before you can p erform FPN
calibration. An error m essage is retu rned if you attem p t to
p erform FPN calibration w hen u sing
csn 0-2
.
Althou gh in theory a u ser can op tim ize coefficients on a p ixel-
by-p ixel basis, in p ractice this becom es u nm anageable as there
are over 4 m illion p ixels. Therefore, coefficient op tim ization via
this com m and is d iscou raged .
Exam p le:
sfc 10 50