Dalsa Spyder2 S2-1-40 Series, User Manual

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28 Spyder2 User’s Manual
03-32-10091-04 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:
Syntax:
sdo t i
Syntax Elements:
t
Tap selection. Allowable values are
1
for one tap or
0
for all
taps. Since the Spyder2 is a one tap camera, the values 1 or 0
are interchangeable.
i
Subtracted offset value in a range from
0
to
511
.
Notes:
•
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
Setting 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:
Syntax:
cao t i
Syntax Elements:
t
Tap selection. Allowable values are
1
for one tap or
0
for all
taps. Since the Spyder2 is a one tap camera, the values 1 or 0
are interchangeable.
i
The line average in a range dependent on the current camera
data mode setting.
8 bit:
1
to
100
DN
10 bit:
4
to
400
DN
See section 3.11 Returning Video Information for more
information on line averages.
Notes: •
This command sets offset in uncalibrated mode (
svm 0
).
Example:
cao 0 100