Falcon2 4M, 8M, and 12M Camera User's Manual
41
Teledyne DALSA
03-032-20107-01
GenICam Parameters
Feature
Sensor Control Menu Item >
Parameter
FPN Global
Black Level Selector
Digital ALL1
Backgrou nd Su btract
Black Level Selector
Digital ALL2
System Gain
Gain Selector
Digital ALL
PRN U correction requ ires a clean, w hite reference. The qu ality of this reference is im p ortant for p rop er
calibration. White p ap er is often not su fficient becau se the grain in the w hite p ap er w ill d istort the
correction. White p lastic or w hite ceram ic w ill lead to better balancing.
For best results, ensure that:
1.
Am bient light flicker (e.g. flu orescent lights) is su fficiently low not to affect
cam era p erform ance and calibration resu lts.
2.
The average p ixel shou ld be at least 20% below the target ou tp u t. If the target
is too close, then som e p ixels m ay not be able to reach fu ll sw ing d u e to
correction ap p lied by the cam era.
3.
When 6.25 % of p ixels from a single row w ithin the region of interest are
clip p ed , flat field correction resu lts m ay be inaccu rate.
4.
Correction resu lts are valid only for the cu rrent black offset valu es. If you
change this valu e, it is recom m end ed that you recalcu late you r coefficients.
Let’s go through a flat field calibration example:
1.
The cam era is p laced in
full internal exposure and frame rate
(no other
exp osu re m od e w ill allow FFC calibration).
2.
Settings su ch as fram e rate, exp osu re tim e, etc. are set as close as p ossible to
the actu al op erating cond itions. Set
system gain to 1
and
background
subtract to 0
, as these are the d efau lts d u ring FFC calibration.
3.
Select
correction active set to user flat field 1
. Go to
flat field correction
mode,
select
calibration
.
4.
Clear existing coefficients by p ressing flat field calibration, clear coefficient.
5.
Place the cam era in the d ark and p ress
FPN calibration
, this p erform s the
FPN correction and saves the FPN coefficients to non -volatile m em ory.
6.
Calibration m od e enables both FPN and PRN U correction . Verify signal
ou tp u t is close to 0 DN .
7.
Illu m inate the sensor to 65 % satu ration and set
flat field target
to 80 %
satu ration.
8.
Press
PRN U calibration
.
9.
Save
the flat field calibration.
Here is the factory calibration procedure for the 8M camera:
1.
The cam era is p laced in fu ll internal, 8 tap s, 10 bits, active w ind ow (3328 x
2816, only available to factory), system gain 1, backgrou nd su btract 0, global
FPN calibrated su ch that d ark FPN is 30 DN (10 bit) 50 fp s, 1500 µs exp osu re.
This last p art is im p ortant (50 fp s, 1500 µs exp osu re) and ensu res that the
cam era is in non-concu rrent m od e. In non -concu rrent m od e, read ou t and
integration d o not overlap thu s elim inating som e re sid u al artifacts.
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