Digital Signal Processing - Dalsa Piranha HS Series User Manual

Piranha HS-xx RoHS User Manual

Digital Signal Processing

Subtracting Background
Purpse:
Sytax
Syntax Elements:
Notes:
Related Command s
Example
Setting Digital Gain
Purpose:
Syntax:
Syntax Elements:
Notes:
Related Command s:
Example:
Teledyne DALSA
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Use the background subtract command after performing flat field
correction if you w ant to improve your image in a low contr ast
scene. You should try to make your d arkest pixel in the scene
equal to zero.
ssb t i
t
Tap selection. Allow able range is 1 to number 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
Improves signal output sw ing after a background subtract. When
subtracting a d igital value from the d igital vid eo signal, using the
ssb
command , the output can no longer reach its maximum. Use
the this command to correct for this w here:
ssg value =
ssg t i
t
Tap selection. Allow able range is 1 to number 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 multiplied by this value w here:
D igital G ain=

Use this command in conjunction w ith the
(d escribed above).

Teled yne DALSA recommend s 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
max output value
max output value - ssb value
i
4096
61
ssg
command .
ssb
command
ccf
command
03-032-20013-03