National Instruments IMAQ Vision for Measurement Studio - Manual (Page 60)

Chapter 5 Machine Vision
IMAQ Vision for LabWindows/CVI User Manual 5-14 ni.com
Figure 5-7. Symmetry
Feature detail
A template with relatively coarse features is less sensitive to variations in
size and rotation than a model with fine features. However, the model must
contain enough detail to identify it.
Figure 5-8. Feature Detail
Positional information
A template with strong edges in both the x and y directions is easier to
locate.
Figure 5-9. Positional Information
Rotationally
Symmetric
Rotationally
Asymmetric
Good
Feature Detail
Ambiguous
Feature Detail
Good Positional
Information in x and y
Insufficient Positional
Information in y