User`s manual

Operation and Features
3-50 Basler L304kc
Draft
3.10.4 Color Shift Correction
Under certain operating conditions, L304kc cameras are subject to a “color shift” effect. Color
shifting is seen when you hold the camera’s exposure time constant and you increase or decrease
the line rate. The more you increase or decrease the line rate, the greater the color shift effect will
be. The color shift effect occurs because the camera’s spectral response changes when you
change the line rate while holding the exposure time constant. The color shift effect can have a
negative influence on the color balance in your captured images.
L304
kc cameras have a color shift correction feature that will automatically correct for the color
shift effect. Three parameters are associated with the color shift feature: red color shift correction,
green color shift correction and blue color shift correction.
Each of the parameters is adjustable on a scale from 1 to 100. You will see the most correction
when the parameter is set to 1 and the least correction when the parameter is set to 100.
To use the color shift correction feature correctly, follow this procedure:
1. Make sure that the color shift correction feature is disabled.
2. Set the camera for the highest line rate you will use during normal operation.
3. Capture images and examine the color balance in the images. Use the red, green and blue
gain settings (see Section 3.6) to adjust the color balance as desired.
4. Set the camera for the lowest line rate you will use during normal operation.
5. Enable color shift correction.
6. Capture images and examine the color balance in the images. Depending on how much you
changed the line rate, you will see a change in the color balance of your images. Use the red,
green and blue color shift correction settings to return the color balance to your desired
level.
Enabling and Setting Color Shift Correction
You can enable and set the color shift correction feature with the Camera Configuration Tool Plus
(CCT+) or by using binary write commands from within your own application to set the camera’s
control and status registers (CSRs).
With the CCT+
With the CCT+ (see Section 4.1), you use the Color Shift Correction Mode parameter in the Image
Enhancement parameters group to enable color shift correction.
You use the Red Color Shift Correction, Green Color Shift Correction and Blue Color Shift
Correction parameters to set the amount of correction for each color.
L
Using the dark noise cancellation feature (see Section 3.10.2) will also eliminate
the “color shift” effect. If you are operating the camera under conditions that might
cause color shifting, we strongly suggest that you first try using the dark noise can-
cellation feature to eliminate color shifting. If you find that the dark noise cancella-
tion feature is not appropriate for your application, you should use the color shift
correction feature.