Dalsa Piranha ES-80-08k40-00-R User Manual page 61

Piranha ES-xx User Manual
Digital Signal Processing
Subtracting Background
Purpose:
Syntax
Syntax Elem ents:
N otes:
Related Com m and s
Exam ple
Setting Digital Gain
Purpose:
Syntax:
Syntax Elem ents:
N otes:
Related Com m and s:
Exam ple:
Teledyne DALSA
Use the background subtract com m and after perform ing flat field
correction if you w ant to im prove your im age in a low contrast
scene. You should try to m ake your d arkest pixel in the scene
equal to zero.
ssb t i
t
Tap selection. Allow able range is 1 to num ber of CCD taps,
or 0 for all taps.
i
Subtracted value in a range in DN from 0 to 4095 (12 bit LSB).

See the follow ing section for d etails on the
ssg
ssb 0 500
Im proves signal output sw ing after a background subtract. When
subtracting a d igital value from the d igital vid eo signal, using the
ssb
com m and , the ou tput can no longer reach its m axim um . Use
the this com m and to correct for this w here:
max output value
ssg value =
max output value - ssb value
ssg t i
t
Tap selection. Allow able range is 1 to num ber of CCD
taps, or 0 for all taps.
i
Gain setting. The gain ranges are 0 to 65535. The d igital
vid eo values are m ultiplied by this value w here:
Digi tal Gain=

Use this com m and in conjunction w ith the
(d escribed above).

It is recom m end ed that i is never set below 4096. Setting i to
0 w ill result in only 0 output d ata.

Digital offset is set to zero after send ing the
ssb, sdo
ssg 1 4500
ssg
com m and .
4096
ssb
com m and
ccf
com m and
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