Omron FH-1 series User Manual page 333

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.
Model image
C
For partial defect For wide line
C C
Correlation: 54 Correlation: 74
Larger Horizontal
C
Correlation: 43 Correlation: 58
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
-15°
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.
Perform detailed
Roughly search within
searches in the areas
the search region for
around each candidate
candidate points.
point.
Vision System FH/FZ5 Series
User's Manual (Z365)
For dark image
C
Correlation: 99
Different shapes
B
Correlation: 58
Reference
-5° 5°
-10°
10°
15°
Measurement Mechanism
7
331