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 Description
Correlation (CR) 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.
Shape (PT) 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.
Additional Information
Basic selection flow:
Does Measurement
object (workpiece)
rotate?
Rotation range of
measurement
object (workpiece)
yes
no
No rotation (CR)
Rotation (PT)
Rotation (CR)
narrow
All
Search Speed
For processing items to perform search processing such as Search and Classification, you can spec-
ify the search processing speed by through the model parameter items Stable, Precise, and/or
Skipping angle. If the value specified for Stab.. or Prec.. is small or if the value for Skipping angle is
large, the processing speed can be increased since the amount of information for the models will be
decreased during the search. In contrast, if the values specified for Stab., or Prec. are large or if the
value for Skipping angle is small, the processing speed is slow because search is performed without
the amount of model information being reduced. Specify appropriate values for Stable, Precise, and
Skipping angle according to the measurement conditions.
Measurement time: Short
Measurement time: Long
Value for "Staple" / "Precise": Small
Value for "Skipping angle" : Large
Measurement precision: Low
Measurement precision: High
Value for "Staple" / "Precise": Large
Value for "Skipping angle" : Small
Appendices
A - 13
FH/FHV Series Vision System User’s Manual (Z365-E1)
A-5 Measurement Mechanism
A
A-5-2 Search Processing Mechanism
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