Piranha ES-xx User Manual
Teledyne DALSA
03-032-20070-02
61
Digital Signal Processing
Subtracting Background
Pu rp ose:
Use the backgrou nd su btract com m and after p erform ing flat field
correction if you w ant to im p rove you r im age in a low contrast
scene. You shou ld try to m ake you r d arkest p ixel in the scene
equ al to zero.
Syntax
ssb t i
Syntax Elem ents:
t
Tap selection. Allow able range is 1 to nu m ber of CCD tap s,
or 0 for all tap s.
i
Su btracted valu e in a range in DN from 0 to 4095 (12 bit LSB).
N otes:
See the follow ing section for d etails on the
com m and .
Related Com m and s
Exam p le
ssb 0 500
Setting Digital Gain
Pu rp ose:
Im p roves signal ou tp u t sw ing after a backgrou nd su btract . When
su btracting a d igital valu e from the d igital vid eo signal, u sing the
com m and , the ou tp u t can no longer reach its m axim u m . Use
the this com m and to correct for this w here:
ssg value =
max output value
max output value - ssb value
Syntax:
ssg t i
Syntax Elem ents:
t
Tap selection. Allow able range is 1 to nu m ber of CCD
tap s, or 0 for all tap s.
i
Gain setting. The gain ranges are 0 to 65535. The d igital
vid eo valu es are m u ltip lied by this valu e w here:
Digi tal Gain=
4096
N otes:
Use this com m and in conju nction w ith the
com m and
(d escribed above).
It is recom m end ed that i is never set below 4096. Setting
i
to
0 w ill resu lt in only 0 ou tp u t d ata.
Digital offset is set to zero after send ing the
com m and
Related Com m and s:
Exam p le:
ssg 1 4500
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