Piranha4 8K Color Camera User's Manual
51
Teledyne DALSA
03-032-20156-02
Calibrating the Camera
Important Note
:
to ensu re best resu lts, the cond itions u nd er w hich you calibrate the cam era (e.g.
tem p eratu re and illu m ination) shou ld be as close to the actu al op erating cond itions as p ossible.
Figure 23: Flat Field Calibration in CamExpert
Overview
The follow ing d iagram and accom p anying d escrip tion exp lain the cam eras signal p rocessing chain. Each
elem ent show n, w ith the excep tion of color interp olation, is u ser p rogram m able.
Figure 24: Camera Calibration Process.
D igital Processing
1.
Fixed p attern noise (FPN ) calibration is u sed to su btract any resid u al d ark level that m ay occu r in
the ap p lication.
2.
Photo resp onse non u niform ity (PRN U) calibration is u sed to correct for variations in the
illu m ination intensity and / or lens vignetting. When p erform ed , this calibration w ill cau se the
cam era to have a flat resp onse to a w hite target in the field of view . The ou tp u t target valu e for
PRN U calibration can be set by the u ser.
3.
The w hite balancing gains are u sed set the red , green and blu e resp onse to equ al valu es w ith a
w hite target in the field of view . The w hite balance gains can be ind ivid u ally set by the u ser, bu t
w ill be overrid d en by the cam era w hen the cam era p erform s PRN U calibration or w hite
balancing com m and s.
4.
The sensor has 4K red and 4k blu e alternating p ixels. To create 8K red and 8k blu e p ixels, the blu e
p ixels located at the red p osition are d eterm ined by averaging the tw o ad jacent blu e p ixels. The
