Falcon 4M Camera Manual
03-032-20044-03
Teledyne DALSA
58
Factory Calibrated Analog Gains
The cam era has a factory calibrated analog gain settin g. Ad ju stm ent of analog gain is not
available to the u ser, how ever. Digital gain is available via the set system gain com m and
(
ssg)
.
Subtracting Background
Pu rp ose:
Use the backgrou nd su btract com m and if you w ant to im p rove
you r im age in a low contrast scene. This com m and is u sefu l for
system s that p rocess 8 bit d ata bu t w ant to take ad vantage of the
camera‘s 10 bit d igital processing chain. You should try to make
you r d arkest p ixel in the scene equ al to zero.
Syntax:
ssb
t i
Syntax Elem ents:
t
Color selection . The allow able range is
1
to
4
, or
0
for all tap s.
1 = Red , 2 = Green (Red ), 3 = Green (Blu e), 4 = Blu e
i
Su btracted valu e in a range in DN from
0
to
511
.
N otes:
When su btracting a d igital valu e from the d igital vid eo signal
the ou tp u t can no longer reach its m axim u m . Use the
ssg
com m and to correct for this w here:
ssg value =
max output value
max output value - ssb value
See the follow ing section for d etails on the
ssg
com m and .
Entering a large valu e backgrou nd w ill cau se the cam era to
d igitally clip the ou tp u t im age.
On a color cam era the
ssb
com m and can be u sed to p erform
offset ad ju stm ent on each color . This m ay be requ ired as the
gain on each color is typ ically d ifferent.
On the m onochrom e m od el, u se the ‗all tap ‘ setting (
0
) to
ad ju st the overall offset.
N ote that
ssb
can only be u sed to DECREASE offset. The
sao
com m and can be u sed to globally increase offset.
Related Com m and s:
ssg
Exam p le
ssb 0 25