Basler A400K Bedienungsanleitung PDF herunterladen (Seite 102)

Features AW00118501000

94 Basler racer Camera Link

Creating a "Usershading" File for Offset Shading Correction

To create a "usershading" file for offset shading correction, perform the following steps:

1. Adjust the lighting, optics, line rate, exposure time control mode, exposure time, gain, and

camera temperature as you would for normal operation.

2. Prevent light from striking the camera’s sensor: Cover the camera lens, close the iris in the

camera lens, or darken the room so that the camera will be capturing lines in complete

darkness.

3. Set the camera’s X Offset and Width parameters so that the entire width of the sensor will be

used during line acquisition.

Note: You can create a "usershading" file for an AOI that is narrower than the entire width of

the sensor. In this case, however, the "usershading" file will only apply to the narrower AOI or

to smaller included AOIs. We recommend using the entire width of the sensor.

4. If you use Basler pylon, select Offset Shading in the Basler pylon Viewer or via the Basler

pylon API.

5. 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 Offset Shading Set Selector register to the

desired user set, e.g. User Shading Set 1.

6. 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 Offset Shading Create register to OnePush.

7. Perform at least 128 line acquisitions.

For more information about the line start trigger mode, see Section 6.1 on page 43.

After 128 line acquisitions are completed the camera creates the "usershading" file

automatically. The "usershading" file is stored in the camera’s non-volatile memory and is not

lost if the camera power is switched off.

Creating a "usershading" file for offset shading correction will overwrite any

"usershading" file for offset shading correction that is already in the camera’s

memory.

If you want to preserve the previous "usershading" file save it to your PC before

creating the new "usershading" file.

For information about saving a "usershading" file to the PC, see Section 8.8.3.2

on page 96.

Any time you make a change to the line rate, exposure time control mode,

exposure time, gain, or camera temperature, you must create a new

"usershading" file for offset shading correction. Using an out of date "usershading"

file can result in poor image quality.

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Basler A400K Bedienungsanleitung Seite 102