Search Processing Mechanism - Omron FH-1 series User Manual

Search Processing Mechanism

Reference image patterns are registered as models and then search is performed for the parts of input images
that most resemble the models. The degree of similarity is represented with a correlation value, inspection for
defects and different parts being mixed in can be performed.
The search process is performed over several distinct stages.
1
Register a reference model.
Note
Model Status and Measurement Processing
• Measurement time and accuracy may be affected by the status of model in the following ways. Please select
measurement objects that are in good condition (clean) for Model Registration.
• In the case of large or complicated models, processing time is prolonged.
• With extremely small models or models without features, search processing is unstable.
2
Perform rough search of overall
measurement region.
Search for the model over the entire
measurement region.
3
Perform additional searching near the
model.
Search Detection Method
With search processing, there are two types of detection methods: Search by "Correlation (CR)" and search by
"Shape (PT)".
The detection method can be selected by changing the "Rotation" settings for each processing item.
Setting item
CR
PT
Vision System FH/FZ5 Series
User's Manual (Z365)
Measurement for locations where there is high correlation (similar areas) between the color of
the model registration image and the input image is performed. Since brightness is normalized
in this operation, changes in brightness do not affect searching for correct positions.
Measurement for locations where there is a high degree of similarity between the shape of the
model registration image and the input image is performed. Since measurement is based on
shape consistency (profile of model), positions can be measured accurately even if portions of
the model are missing in images.
When the rotation angle range is wide (such as full angle), a search that is faster than a "CR"
search can be performed. Note, however, that this method may be less reliable than a "CR"
search if the image has low contrast or blurred edges.
Register the package
marking as a model
Description
Measurement Mechanism
Search range
(Search model range)
Model
Model
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