Chromasens CD40127_R02 allPIXA_pro_User Manual.docx
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8.4.2 Use a stored white (gain) reference image
Creation of shading reference is only necessary during commissioning or if the gain values are
changed considerably.
Note
: The white reference target must be placed in the best focus plane of the camera.
Therefore any features on its surface (for example dust, scratches) end up in the calibration
profile of the camera. To avoid this if you use a static (non-moving) white reference target, use
a clean white ceramic or plastic material, not paper. Ideally, the white object should move
during the calibration process because the movement results in an averaging process and the
camera diminishes the effects on any small variation in the white reference.
1
Start the reference wizard
On the toolbar, click
Start reference wizard
.
2
Select reference type and source
Click
White (flat-field) level reference
.
Click
Load reference image from disk
:
Click
Next
.
3
Choose white reference image
Click
Select file
:
In the file dialog box, select the reference file, and click
Open
.
Click
Next
.
Note:
For special applications, the three color levels can also originate from various
images. In this case select the check box. The page then changes and you can select
separate files for the three color channels