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Measurement Mechanism
838
Vision System FH/FZ5 Series
User’s Manual (Z340)
Correlation value
With processing items that use search processing, judgement is performed through correlation values.
Correlation values are used to check the consistency (degree of similarity) between actual measurement images
and reference model images. If portions of measured images are missing or if shapes are different, the
correlation value is lower.
Search Angle Range, Skipping Angle
These are values, based on the model registration image, that indicate the allowable rotation interval (skipping
angle) and overall maximum rotation range for the model (angle range). Search is performed for objects that
most resemble these acceptable models.
Example: When angle range is 15×and skipping angle is 5×
Candidate Point Level
This is the level used for finding models when searching. Images with a correlation value higher than the
candidate point level are used to establish candidate points for search inspection.
Correlation: 58
Horizontal
C
Correlation: 54
For partial defect
Correlation: 74
For wide line
Correlation: 99
For dark image
Correlation: 43
Larger
Correlation: 58
Different shapes
Model image
B
C
C
C
C
C
-15°
Registration model
-10°
-5°
Reference
10°
15°
5°
Roughly search within
the search region for
candidate points.
around each candidate
point.
Perform detailed
searches in the areas
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