Dalsa Linea Color CL User Manual page 12

Example 3. Target running faster than example 1. same EXSYNC (trigger)
frequency
Line Spatial Correction = 1 (ssa = 1)
Parallax Correction
When the camera it is not perpendicular to the object surface the camera will exhibit color.
The parallax distortion increases when imaging at steep angles relative to the cameras
imaging plain. This is an optical effect caused by the line spacing of the three individual
colors. This spacing results in a different magnification for each line at high angles. As
shown in the figure below, there is color distortion at the extremes ends of the image but at
the center of the image the color distortion does not show up.
Using the camera's Parallax Correction feature, the optical magnification for each line is
adjusted such that colors can be lined up at the extreme ends of the image without affecting
the center. Using the feature Image Distortion Correction Mode (shm = 1) this feature can
be turned on. Using the feature Image Distortion Correction Line Selector the user can
select red and green to correct the distortion. Note: the red and green lines are adjusted to
align with the center blue line. Image Distortion Parallax Correction Pixel Stretch (sha - Set
horizontal alignment in float f<value 0-3>) is used to add the amount of correction needed
to the image. The value entered here must be between 0 and 3 (decimal values are
accepted).
12 
Color
Fringing
Color
Fringing
Line Spatial Correction = 0.5 (ssa = 0.5)
8192 pixels
Figure 1: Example Image with Horizontal Color Alignment Issues
The Linea Color Camera