Omron fh-1 series User Manual

A - 13
Appendices
Vision System FH/FHV/FZ5 Series User’s Manual (Z365)
A-5 Measurement Mechanism
A
A-5-2 Search Processing Mechanism
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.
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°
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 Value
Search Angle Range, Skipping Angle
Candidate Point Level
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

Omron fh-1 series Specifications

General

Brand	Omron
Model	fh-1 series
Category	Machine Vision Systems
Language	English