Rockwell Automation 5370-CVIM2 Module - Manual (Page 201)

Chapter 6
Reference Tools
6–42
Figure 6.36 illustrates using high resolution on the X–axis and low resolution
(1:8) on the Y–axis. The feature in this example is a multi–pin connector, and
the objective of the reference window tool is to locate and track the lower
portions of the leftmost two pins.
Figure 6.36 Examples: Using Asymmetrical X and Y Scaling Ratios
A B
X Scale = 1:1, Y Scale = 1:1 X Scale = 1:1, Y Scale = 1:8
The figure shows how the feature and search images appear using 1:1 scaling
on both axes in (A), and using 1:1 on the X–axis and 1:8 on the Y–axis in
(B). Notice that the horizontal resolution in (B) is the same as in (A); and,
although the vertical resolution has been changed, that change has no effect
on accuracy in this example.
The major difference is in the inspection cycle time: Using 1:1 on both axes
requires 725ms for each inspection cycle, while using 1:1 on the X–axis and
1:8 on the Y–axis requires only 70ms –– one–tenth as much time.