User`s manual

Standard Features AW00049313000
172 Basler runner
11.1.2 Black Level
Adjusting the camera’s black level will result in an offset to the pixel values output from the camera.
As mentioned in the "Functional Description" section of this manual, the sensor uses two different
taps to read pixel data out of the imaging sensor. One tap is used to read out values for the even
numbered pixels in the sensor and one is used to read out values for the odd numbered pixels. As
a result of this design, there are three black level adjustments available: Black Level Raw All, Black
Level Raw Tap 1, and Black Level Raw Tap 2.
Black Level Raw All is a global adjustment, i.e., its setting affects both the odd numbered and the
even numbered pixels in the sensor. The Black Level Raw All value can be set in a range from 0 to
1023.
Black Level Raw Tap 1 sets an additional amount of black level adjustment for the even numbered
pixels in the sensor (pixels 0, 2, 4, 6, etc.). The Black Level Raw Tap 1 value can be set in a range
from 0 to 1023. The total black level for each even numbered pixel will be the sum of the Black Level
Raw All value plus the Black Level Raw Tap 1 value.
Black Level Raw Tap 2 sets an additional amount of black level adjustment for the odd numbered
pixels in the sensor (pixels 1, 3, 4, 7, etc.). The Black Level Raw Tap 2 value can be set in a range
from 0 to 1023. The total black level for each odd numbered pixel will be the sum of the Black Level
Raw All value plus the Black Level Raw Tap 2 value.
If the camera is set for a pixel data format with an 8 bit depth, an increase of 64 in a black level
setting will result in a positive offset of 1 in the pixel values output from the camera. And a decrease
of 64 in a black level setting will result in a negative offset of 1 in the pixel values output from the
camera.
If the camera is set for a pixel data format with a 12 bit depth, an increase of 4 in a black level setting
will result in a positive offset of 1 in the pixel values output from the camera. A decrease of 4 in a
black level setting will result in a negative offset of 1 in the pixel values output from the camera.
For normal operation, we recommend that you set the value of Black Level Raw Tap 1 and Black
Level Raw Tap 2 to zero and that you simply use Black Level Raw All to set the black level. Typically,
the tap black level settings are only used if you want to adjust the black level balance between the
even numbered and the odd numbered pixels in the sensor.
Note
The sum of the Black Level Raw All setting plus the Black Level Raw Tap 1
setting must be less than or equal to 1023.
The sum of the Black Level Raw All setting plus the Black Level Raw Tap 2
setting must also be less than or equal to 1023.