Camera Performance and Features
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31
Compensating for Encoder Errors (Spatial Correction)
See Camera Control Category in Appendix A for GenICam features associated with this section and
how to use them.
Related Feature: Line Spatial Correction
To achieve a sharp image in the vertical direction when running the camera in TDI mode or in HDR
mode it is important that the lines being used are aligned correctly. The line spatial correction
feature is used to ensure that these lines align.
Figure 14. Camera Line spacing
The camera ensures the scan direction alignment of the lines by delaying the image data for each
line a set amount of time, as dictated by the scan direction.
Assuming that the encoder generates a pulse that is equal to the object pixel, Line Spatial
Correction will be 1. However, guaranteeing the encoder pulse accuracy may not always be
possible. In addition, lens magnification may not be exact—which will introduce a similar error.
The camera has a Line Spatial Correction feature that can correct for these small encoder or
magnification errors on a sub-pixel level. The sub-pixel spatial correction resolution is 1/16
th
of a
row. The feature accepts up to two decimal places and will adjust the entered sub-pixel adjustment
component accordingly. This feature can only be adjusted when the acquisition is stopped.
Examples of artifacts generated by a small encoder error:
5 µ
m or
1 line spacing
5 µ
m or
1 line spacing
5 µ
m or
1 line spacing
5 µ
m x
5 µm line 3 pixels (
high responsivity)
5 µ
m x
5 µm line 4 pixels (high responsivity)
5 µ
m x
5 µm line 2 pixels (high responsivity)
5 µ
m x
5 µm line 1 pixel
s (low responsivity)
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