Digital Shift; Digital Shift In 10 Bit Output Mode - Basler L100k User Manual

Operation and Features

3.7 Digital Shift

The "digital shift" feature allows you to change the group of bits that is output from each ADC.
Using the digital shift feature will effectively multiply the output of the camera by 2 times, 4 times
or 8 times. Section 3.7.1 describes how digital shift works when the camera is operating in a 10
bit output mode and Section 3.7.2 describes how digital shift works when the camera is operating
in an 8 bit output mode.
Please note the precautions you must observe to effectively use this feature (see Section 3.7.3).
You can set digital shift using either the Camera Configuration Tool Plus (see Section 4.1) or
binary commands (see Section 4.2).
With the Camera Configuration Tool Plus, you use the Digital Shift setting in the Output parameter
group.
With binary commands you use the Digital Shift command.

3.7.1 Digital Shift in 10 bit Output Mode

No Shift
As mentioned in Section 3.1, the L100
ADCs to digitize the output from the CCD sensor.
When the camera is operating in 10 bit output
mode, by default, the camera transmits the 10 bits
that are output from each ADC.
Shift Once
When the camera is set to shift once, the output
from the camera will include bit 8 through bit 0 from
each ADC along with a zero as an LSB.
The result of shifting once is that the output of the
camera is effectively doubled. For example,
assume that the camera is set for no shift, that it is
viewing a uniform white target, and that under these
conditions the reading for the brightest pixel is 100.
If you changed the digital shift setting to shift once,
the reading would increase to 200.
Note that if bit 9 is set to 1, all of the other bits will automatically be set to 1. This
means that you should only use the shift once setting when your pixel readings in
10 bit mode with no digital shift are all below 512.
Since the shift once setting requires that the least significant bit is always a "0" and
never a "1", no odd gray values can be output. The gray value scale will only include
gray values of 2, 4, 6 and so forth. The absence of gray values is commonly referred
to as "Missing Codes".
3-24
DRAFT
uses 10 bit
k
bit
9
M
S
B
bit
9
ADC
bit bit bit bit bit bit bit
8 7 6 5 4 3 2
Not Shifted
ADC
bit bit bit bit bit bit bit
8 7 6 5 4 3 2
M
S
B Shifted Once
BASLER L100
bit bit
1 0
L
S
B
bit bit
"0"
1 0
L
S
B
k Series