Rockwell Automation 5370-CVIM2 Module - Manual (Page 407)

5 Chapter Chapter 7
Inspection Tools
7–169
Method
The method selection determines the location of a midpoint offset. The two
available choices are these:
Midpoint and Weighted .
When you pick the Method field ( Feature selection panel) successively, the
selection toggles to the opposite method. Thus, Midpoint changes to
Weighted , and vice versa.
Figure 7.135 compares the two methods. In this example, the profile window
is positioned around two dark objects that are asymmetrical; thus, each
objects’ “center of gravity” is skewed toward its right side. The threshold is
set near the top of the profile image so the profile tool can detect the extreme
left edge of each object.
Figure 7.135 Example: Comparing the Midpoint and Weighted Methods
Threshold
(level 217)
A
B
Offset
marker
Offset
marker
When Midpoint is selected, the midpoint offset will be located exactly
midway between the edges of an object, as illustrated by Figure 7.135 (A).
When
Weighted is selected, the offset is skewed rightward, toward the
center of gravity of the object, as illustrated by Figure 7.135 (B).