Digital Shift; Digital Shift With 12 Bit Pixel Formats - Basler acA2040-55 User Manual

Features
7.5

Digital Shift

For information about the availability of digital shift on a specific camera model, see Table 41 on
page 191 and Table 42 on
The digital shift feature lets you change the groups of bits that are output from the ADCs in the
camera. Using the digital shift feature will effectively multiply the output of the camera by 2 times, 4
times, 8 times, or 16 times. The next two sections describe how the digital shift feature works when
the camera is set for a 12 bit pixel format and when it is set for a 8 bit pixel format. There is also a
section describing precautions that you must observe when using the digital shift feature and a
section that describes enabling and setting the digital shift feature.
If the digital shift feature is not available for your camera you can use the gain
feature to obtain an effect similar to adjusting digital shift.
For more information about the gain feature, see Section 7.2 on
7.5.1

Digital Shift with 12 Bit Pixel Formats

No Shift
As mentioned in the Functional Description section of
this manual, the camera uses 12 bit ADCs to digitize
the output from the imaging sensor. When the camera
is set for a pixel format that outputs pixel data at 12 bit
effective depth, by default, the camera transmits the
12 bits that are output from the ADC.
Shift by 1
When the camera is set to shift by 1, the output from
the camera will include bit 10 through bit 0 from the
ADC along with a zero as an LSB.
The result of shifting once is that the output of the
camera is effectively multiplied by 2. 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 by 1,
the reading would increase to 200.
202
page 192.
ADC
bit bit bit bit bit bit bit
11 10 9 8 7 6 5
M
S
B
No Shift
ADC
bit bit bit bit bit bit bit
11 10 9 8 7 6 5
M
S
B
Shifted Once
AW00123409000
page 193.
bit bit bit bit bit
4 3 2 1 0
L
S
B
bit bit bit bit bit
"0"
4 3 2 1 0
L
S
B
Basler ace USB 3.0