58 Spyder3 S3-14 and S3-24 Monochrome Camera User's Manual
03-032-20117-01 Teledyne DALSA
Subtracting Background
Use the background subtract command after performing flat field correction if you want to improve your
image in a low contrast scene. It is useful for systems that process 8 bit data but want to take advantage of
the camera’s 12 bit d igital p rocessing chain. You shou ld try to make your d arkest pixel in the scene equal
to zero.
Camera Link Command
t:
Tap selection. Allowable range is 1 to 2
depending on camera model, or 0 for all
taps.
i:
Subtracted value in a range in DN from 0
to 4095.
When subtracting a digital value from the digital
video signal the output can no longer reach its
maximum. Use the ssg command to correct for
this where:
ssg value =
max output value
max output value - ssb value
Setting Digital System Gain
Improves signal output swing after a background subtract. When subtracting a digital value from the digital video
signal, using the ssb command, the output can no longer reach its maximum. Use this command to correct for this
where:
ssg value =
max output value
max output value - ssb value
Camera Link Command
t: Tap selection. Allowable range is 1
to 2, or 0 for all taps.
i:
Gain setting. The gain ranges are 0 to
65535. The digital video values are
multiplied by this value where:
Use this command in conjunction with
the ssb command.