Chromasens CD40127_R02 allPIXA_pro_User Manual.docx
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9.5 Reference usage
9.5.1 Black-level correction (offset correction)
Name
Name
Activate black-level correction
Function
This function enables the pixel-wise black-level correction inside the camera.
Channels
All
Unit
Bool
Dependency
None
Notes
Camera:
Value:
Function:
Lower limit
All
0
Off
Upper limit
All
1
On
Black-value correction is made pixel-by-pixel and corrects the different behavior of the
individual pixels (
DSNU
=
D
ark
S
ignal
N
on-
U
niformity) in dark images. Black-value correction
is carried out with a non-exposed sensor (for example if the lens is closed, the illumination is
switched off, or a black reference is scanned).
Black-value correction is carried out individually on each allPIXA pro camera during factory
calibration.
If the gain of the camera changes it's recommended to take a new black-level reference.
Four reference sets for the black-level correction are supported by the allPIXA pro camera as
well as four reference sets for the shading correction. Reference position number can be
entered if a reference is created using the CST Reference Wizard and if it is selected in the
allPIXA pro camera setting. All reference sets can be used for different setups, for example
different f-stops or different illuminations.
This parameter refers to the video values labeled with
(1)
in the diagram in section
4.5.1 figure
10.
9.5.2 Black-reference data set
Name
Name
Black reference data set
Function
Select the data set for black-level correction.
Channels
All
Unit
Integer
Dependency
None
Notes
Four data sets for black-level reference can be stored inside of the camera.
The number for the storage space has to be selected in CST when a new
reference is created with the Reference wizard.
Camera:
Value:
Lower limit
All
Use data set 1
Upper limit
All
Use data set 4
