User`s manual

Falcon 4M Camera Manual
03-032-20044-01 DALSA
52
Subtracting Background
Purpose: Use the background subtract command 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 10 bit
digital processing chain. You should try to make your darkest
pixel in the scene equal to zero.
Syntax:
ssb t i
Syntax Elements:
t
Sensor tap selection. Allowable range is 1 to 2, or 0 for all
taps.
i
Subtracted value in a range in DN from 0 to 511.
Notes:
• 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
m ax out put val ue - ssb val ue
See the following section for details on the ssg command.
• Entering a large value background will cause the camera to
digitally clip the output image.
Related Commands:
ssg
Example
ssb 0 25