National Instruments IMAQTM 用户手册
Chapter 5
Performing Machine Vision Tasks
5-14
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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.
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.
locate.
Figure 5-9. Positional Information
a
Good Feature Detail
b
Ambiguous Feature Detail
a
Good Positional Information in x and y
b
Insufficient Positional Information in y
a.
b.
a.
b.