Dalsa Spyder2 - Page 27

27 Spyder2 User’s Manual
03-032-10091-06 Teledyne DALSA
Subtracting Offset in Calibrated Mode
You can subtract the A/ D offset from the video signal prior to PRNU correction.
To subtract the A/D, use the command:
Sy n t ax :
sdo t i
Sy ntax Elements:
t
Tap selection. Allowable values are 1 for one tap or 0 for all
taps. Si nce the Sp y d er 2 is a one tap camera, the val ues 1 or 0
are i nter changeable.
i
Subtracted offset value in a r ange fr om
0
to
511
.
N otes:
• When subtracting a digital value from the digital video
signal, the output can no longer reach its maximum. Use
the ssg command to correct for this. See section 3.13
Set ting Gains for details on the ssg command.
• Available in calibrated mode only (
svm 1
).
Example:
sdo 0 100
Calibrating Offset
To calibrate the analog offset, use the command:
Sy n t ax :
cao t i
Sy ntax Elements:
t
Tap selection. Allowable values are 1 for one tap or 0 for all
taps. Si nce the Sp y d er 2 is a one tap camera, the val ues 1 or 0
ar e i nter changeable.
i
The l ine average in a r ange dependent on the cur r ent camera
data mode setting.
8 bit: 1 to 100DN
10 bit: 4 to 400DN
See secti on 3.11 Returning Video Informati on
for more
information on line averages.
N otes:
• This command sets offset in uncalibrated mode (
svm 0
).
Example:
cao 0 100