Omron FH Series User Manual page 534

Appendices
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 measure-
ment images and reference model images. If portions of measured images are missing or if shapes
are different, the correlation value is lower.
Model image
C
For partial defect
C
Correlation: 54
Larger
C
Correlation: 43
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°
Registration model
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.
A - 14
For wide line For dark image
C
C
Correlation: 74 Correlation: 99
Horizontal Different shapes
Correlation: 58 Correlation: 58
Reference
-5°
-10°
-15°
B
5°
10°
15°
FH/FHV Series Vision System User's Manual (Z365-E1)