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Operation and Features
BASLER L800
k
3-27
Draft
5. Signal the camera to generate a set of PRNU shading values:
a) You can start the generation of a set of PRNU shading values with the Camera
Configuration Tool Plus (see Section
). With the CCT+, you use the Shading Value
Generate parameter in the Image Enhancement parameters group to start the generation
of a set of PRNU shading values.
b) You can also start the generation of a set of PRNU shading values by using a binary write
command (see Section
) to write a value to the Generate field of the Shading Value
).
6. The camera must capture at least 16 lines to generate a set of PRNU shading correction
values. If your camera is set to control exposure with an ExSync signal, you must generate at
least 16 ExSync signal cycles after you signal the camera to begin generating the values. If
you are running the camera in a Free-run exposure mode, you must wait long enough for the
camera to capture at least 16 lines.
a) When the camera is capturing the lines it needs to create the PRNU shading values, the
line valid and data valid signals will go high and low as you would normally expect.
However, the data in these lines is not useful to you and should be ignored.
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When you generate the PRNU shading values, you will have two options:
1. You can generate the PRNU shading values without using DSNU shading
correction. If you do this the pixel values used to calculate the PRNU correc-
tion values will not be corrected for DSNU.
2. You can generate the PRNU shading values while using DSNU shading cor-
rection. If you do this the pixel values used to calculate the PRNU correction
values will be corrected for DSNU. (For this option to work correctly, you
must generate a set of DSNU values before you generate the PRNU values.)
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If you started the generation of the shading values using the CCT+ and you are
using an ExSync signal to trigger line capture and you are operating the camera
at a line period greater than approximately 300 ms, you should be aware of a
potential problem. Under these conditions, the CCT+ may time out while it is
waiting for the camera to capture 16 lines and you may see a “Camera is not
responding ...” error message. This error is not fatal to the shading value cre-
ation process. If you close the error message window, wait several seconds and
then click the Refresh button on the CCT+, the shading values will be properly
created.
If you started the generation of the shading values using binary commands and
you are using an ExSync signal to trigger line capture and you are operating the
camera at very low line rates, you should be aware of a restriction. The camera
will not acknowledge or respond to binary commands while it is performing the
16 line captures needed to create a set of shading values. Once you have is-
sued the binary command to start generating shading values, you should wait
until the generation process is complete before you issue any further binary
commands. The time needed to complete the generation process will be equal
to 16 times the line period.
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