Setting Analog Gain - Dalsa Spyder3 S3-14-01k40-00-R User Manual

Spyder3 S3-14 and S3-24 Monochrome Camera User's Manual
2. The d igital offset (
offset) so that ap p lication of the PRN U coefficient d oesn't resu lt in artifacts at low lig ht levels d u e to
the offset valu e. You m ay w ant to set the
p erform PRN U correction.
3. Photo-Resp onse N on-Uniform ity (PRN U) coefficients (calcu lated u sing the
are u sed to correct the d ifference in resp onsivity of ind ivid u al p ixels (i.e. given the sam e am ou nt of
light d ifferent p ixels w ill charge u p at d ifferent rates) and the change in light intensity across the
im age either becau se of the light sou rce or d u e to op tical aberrations (e.g. there m ay be m ore light in
the center of the im age). PRN U coefficients are m u ltip liers and are d efined to be of a valu e greater
than or equ al to 1. This ensu res that all p ixels w ill satu rate together.
4. Backgrou nd su btract (
im age contrast after FPN and PRN U calibration. It is u sefu l for system s that p rocess 8-bit d ata bu t
w ant to take ad vantage of the cam era's 12 bit d igital p rocessing chain. For exam p le, if you find that
you r im age is consistently betw een 128 and 255 DN (8 bit), you can su btract off 128 (
then m u ltip ly by 2 (
Analog Signal Processing: Setting Analog Gain and Offset
All analog signal p rocessing chain com m and s shou ld be p erform ed p rior to FPN and PRN U calibration
and p rior to d igital signal p rocessing com m and s.
N ote: This com m and w ill invalid ate the LUT calibration for the 4k m od el of cam era. Use the
com m and instead .

Setting Analog Gain

Sets the cam era's analog gain valu e. Analog gain is m u ltip lied by the analog signal to increase the signal
strength before the A/ D conversion. It is u sed to take ad vantage of the fu ll d ynam ic range of the A/ D
converter.
Camera Link Command
Parameter Description
t Tap selection. Use 0 for all taps or 1
sag t f
to 2 for individ ual tap selection
f Gain value in a range from –10 to
+10d B.
Example
sag 0 5.2
Calibrating Camera Gain
Instead of m anu ally setting the analog gain to a sp ecific valu e, the cam era can d eterm ine ap p rop riate gain
valu es. This com m and calcu lates and sets the analog gain accord ing to the algorithm d eterm ined by the
first p aram eter.
Teledyne DALSA
com m and ) enables the su btraction of the ―artificial‖ A/ D offset (the analog
sdo
sdo
ssb
com m and ) and system (d igital) gain (
ssg 0 8192
) to get an ou tp u t range from 0 to 255.
valu e if you are not u sing FPN correction bu t w ant to
ssg
com m and ) are u sed to increase
Notes
To return the current analog gain setting, use the
com m and gcp or get sag.
ccp cpa
or com m and s)
ssb 2048
) and
ssg
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