Rockwell Automation 5370-CVIM2 Module - Manual (Page 173)

Chapter 6
Reference Tools
6–14
Feature Selection
When you pick the button on the axis configuration panel, the
Define Feature panel appears, as shown in Figure 6.12.
Figure 6.12 Example: Selecting the Define Feature Panel
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The thresholding/filtering settings, along with the width selection, determine
which light/dark transitions along a reference line axis are detected as edges.
The purpose of the feature selection process is to specify which one of these
edges (or midpoints between edges) is to be used as the one basis for
calculating shift and/or rotation compensation for the associated axis.
The edge selection process also identifies the edge search direction and the
edge search mode.
Here is a brief description of the reference point selection functions:
•
Mode –– This function selects a feature mode, which identifies a range of
edges within which a reference line searches for the specified reference
point.
•
Search Direction –– This function selects the direction of the search for
the specified reference point along a reference line axis.
•
Offset –– This function identifies which edge (or midpoint between
consecutive edges) along the length of a reference line axis is to be used
as the basis for calculating shift/rotation compensation values.