Chromasens CD40127_R02 allPIXA_pro_User Manual.docx
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9.5.3 Shading correction (flat-field correction)
Name
Name
Activate whilte-level correction
Function
This function enables the pixel-wise shading correction inside the camera.
Channels
All
Unit
Bool
Dependency
None
Notes
Camera:
Value:
Function:
Lower limit
All
0
Off
Upper limit
All
1
On
Shading correction is made pixel-by-pixel and corrects the different behavior of the individual
pixels in the images (
PRNU = P
hoto
R
esponse
N
on-
U
niformity). In addition, it compensates
any illumination non-homogeneities.
Four reference sets for the shading correction are supported by the allPIXA pro camera, as
well as four reference sets for the black-level correction. The 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 for
different f-stops or different illuminations.
This parameter refers to the video values labeled with
(2)
in the diagram in section
The internal processing is not limited up to 255@8bit. This means that after shading correction
it is possible to additionally process higher values such as 300, which can be taken without
loss into the visible area by using the brightness and contrast control afterward.
Internal value is a 14 bit video, Diagram range is 8-bit range because the image at the Camera
Link port is usually 8-bit range.
9.5.4 White reference data set
Name
Name
White reference data set
Function
Select the data set for shading correction.
Channels
All
Unit
Integer
Dependency
None
Notes
Four data sets for white reference can be stored inside the camera. The
number for the storage space has to be selected in CST when a new
reference is created using the Reference wizard.
Camera:
Value:
Lower limit
All
Use data set 1
Upper limit
All
Use data set 4
