Basler L100k User Manual page 50

Operation and Features
software included with most frame grabbers includes a function that will allow you to capture
and store a specific number of lines and to save the captured lines as an image file.)
7. In many cases, when a frame grabber is receiving pixel data for a captured line, the grabber
drops the data for the first few pixels. Since you are using captured pixel data from the frame
grabber to create the shading table, you must make sure that you know how many pixels
your grabber is dropping.
You can use Test Image One (see Section 3.9.1), consult the documentation for your frame
grabber, or speak to your frame grabber manufacturer to determine the number of pixels that
the grabber drops at the start of each line.
Determine the number of pixels that your grabber drops and make note of it.
8. In the CCT+, double-click on "Upload Correction Data". A Specify Shading Correction Image
window will open.
9. Click on the
window to navigate to the image file that you stored in step 6 and then click the Open button.
10. If you want the shading correction table to be stored in the camera's non-volatile memory
when you upload it to the camera, make sure that the Permanently store shading data in
the camera box is checked. (See the notebox below for more information.)
11. In the Offset box, enter the number of pixels that the frame grabber drops from each line.
12. Click the Load to camera button. The CCT+ will use the image data in the file you selected
to create a shading table and then will upload the table to the camera.
If this process is successful, a message will appear informing you about the ratio of the lightest
pixel to the darkest pixel in the image .
If the process is not successful, an error message will appear. The usual cause of the error is
that the ratio of the lightest pixel in the image to the darkest pixel is greater than 2/1. When
this is the case, the shading feature will not be able to fully correct the shading variations.
13. Once the correction table has been successfully created and uploaded, you can use the
shading correction feature. To enable shading correction, use the Shading Correction setting
in the CCT+.
Normally, a copy of the shading table is stored in a volatile memory location and a copy
is also stored in a non-volatile memory location. When shading correction is enabled,
the FPGA in the camera uses the table stored in volatile memory to perform shading cor-
rection by applying the correction values in the table to the pixel values for each cap-
tured line.
When you store shading correction data to the camera with the CCT+, you can store the
data in both the volatile and the non-volatile memory or in the volatile memory only. A
shading table stored in the non-volatile memory will not be lost when power is switched
off.
When you upload the shading table and the Permanently store shading data in the
camera box is checked, the table will be loaded to both the non-volatile and the volatile
memories. Any table already in these memories will be overwritten.
When you upload the shading table and the Permanently store shading data in the
camera box is not checked, the table will be loaded to the volatile memory only. This
feature is useful if you wish to load and test a shading table without overwriting the table
that is currently stored in the non-volatile memory.
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DRAFT
button and an Open Shading Correction Image window will appear. Use the
BASLER L100
k Series