AW00118508000 Features
Basler racer Camera Link 131
5. Perform several line acquisitions and examine the pixel values returned from the camera. The
pixel values for the brightest pixels in each line should be about 90 to 95 % of maximum (i.e., if
the camera is set for 8 bit output, the pixels should be from 90 to 95 % of 255).
a. If the values for the brightest pixels are at 90 to 95 % of maximum, go on to step 6.
b. If the values for the brightest pixels are not at 90 to 95 % of the maximum, adjust your
lighting and/or lens aperture to achieve 90 to 95 %.
6. Perform several line acquisitions and examine the pixel values returned from the camera. In
each line, the values for the darkest pixels must be greater than 1/4 of the values for the
brightest pixels. (If the values for the darkest pixels are less than 1/4 of the values for the
brightest, the camera will not be able to fully correct for shading variations.)
a. If the values for the darkest pixels are greater than 1/4 of the values for the brightest, go on
to step 7.
b. If the values for the darkest pixels are less than 1/4 of the values for the brightest pixels, it
usually indicates extreme variations in lighting or poor quality optics. Make corrections as
required.
7. If you use Basler pylon, select Gain Shading in the Basler pylon Viewer or via the Basler pylon
API.
8. If you use Basler pylon, select "usershading" file in the Basler pylon Viewer or via the Basler
pylon API.
If you use direct register access, set the value of the Gain Shading Set Selector register to the
desired user set, e.g. User Shading Set 1
9. If you use Basler pylon, go to the Create enumeration in the Basler pylon Viewer and select
Once or send a create command via the Basler pylon API.
If you use direct register access, set the value of the Gain Shading Create register to OnePush
10. Perform line acquisitions until the Create value changes to Off or until the Gain Shading Create
register value changes to Off.
The "usershading" file is automatically created. It is stored in the camera’s non-volatile memory.
Any time you make a change to the optics or lighting or if you change the camera’s
gain settings or exposure mode, you must create a new "usershading" file for gain
shading correction. Using an out of date "usershading" file can result in poor
image quality.
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