Dalsa Piranha 2 Series, Руководство пользователя

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36 Piranha 2 User’s Manual
03-032-00493-14 Teledyne DALSA
For FPN (d ark light) the valu e of all p ixels m u st be betw een 1DN and 127DN . For PRN U
(w hite light) the valu e m u st be betw een 128DN an d 254DN . Use the
gl
com m and to
ensu re the p rop er inp u t to th e d igital p rocessing, V
inp u t
.
White light calibration w ill gain u p to m axim u m w hite lig ht p ixel p lu s the m axim u m
FPN su btract p ixel.
When p erform ing any cam era calibration, rand om noise is m inim ized by averaging ou t
u p to 64 lines of valid d ata. To ad ju st the sam p le line size, u se the
css i
com m and ,
w here
i
is 16, 32, 64 (factory setting). A low er valu e red u ces the cam era’s calibration tim e,
at the exp ense of increased coefficient error.
Calibration time Typical
1024 10 sec.
2048 19 sec.
4096 38 sec.
6144 85 sec.
8192 115 sec.
LED blinks green w hile calibrating.
IMPORTANT: While camera is blinking green,
do not power down camera or memory may be corrupted.
Calibration Steps Overview
1. Change cam era vid eo m od e to calibrated u sing the com m and
svm 1
2. Set u p the cam era op erating environm ent (i.e. line rate, exp osu re, gain, etc.)
3. Make su re there are su itable calibration targets. The target to calibrate shou ld be a flat
field , e.g. p lastic or ceram ic for w hite calibration.
4. Set the calibration sam p le size u sing the com m and
css
(see Retu rning Mu ltip le
Lines of Vid eo p age 30).
5. Perform Dark (FPN ) calibration (see Dark Calibration on p age 36).
6. Perform White (PRN U) calibration (see White Light Calibration on p age 37).
7. Save settings and p ixel coefficients u sing the com m an d s
wus
and
wpc
.
N ote: It is im p ortant to d o th e FPN calibration first. Resu lts of the FPN calibration are
u sed in the PRN U p roced u re. We recom m end that you rep eat the calibration w hen a
tem p eratu re change greater than 10°C occu rs.
Dark Calibration
Dark calibration is u sed to rem ove the fixed analog offset from the vid eo p ath. It is
recom m end ed you rep eat th e calibration w hen a tem p eratu re change greater than 10°C
occu rs.
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