CD40047_R04_allPIXA_User-Manual.docx
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11.5 Reference usage
Black-level (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 of the pixel-by-pixel mode 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 wave camera during factory
calibration.
Four reference sets for the black-level correction are supported by the allPIXA wave camera as
well as two reference sets for the shading correction. You can specify the reference position
number if you create the reference using the Reference Wizard in CST, and it can be selected
in the allPIXA wave 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 of
section 4.6.1.
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 reference can be stored inside of the camera. The
number for the storage space has to be selected in the CST during the Shading
wizard process.
Camera:
Value:
Function:
Lower limit
All
0
Data set 1 is used
Upper limit
All
3
Data set 4 is used
