A - 17
Appendices
Vision System FH/FHV/FZ5 Series User’s Manual (Z365)
A-5 Measurement Mechanism
A
A-5-3 Edge Detection Measurement
This level judges whether an edge is present or not.
The maximum value and minimum value for color difference in the edge detection area are determined
and if the difference is less than the noise level, it is judged that there is no edge. When detection is
affected by noise, increase this value.
(within area)
Maximum value - minimum value of color difference < noise level - edge does not exist - measurement
result is fail
Maximum value - minimum value of color difference
> Noise level - edge exists - targeted for measure-
ment
Example: When noise level is set to 30
Set the width for judging noise.
• When no color is specified
If another edge is detected within the width range starting from the point where an edge was first
detected, the newly detected point is considered noise.
• When a color is specified
If the color difference distributions again falls below the edge level within the width range starting
from the point where an edge was first detected, the newly detected point is considered noise.
When points are mistakenly detected as edges due to noise, increase the color difference value.
Noise Level
Noise Width
Max. color difference 60
Min. color difference 15
Measurement
region
60-15>30
Judged as “with
edge” and measure
35-15<30
Processed as “no edge”
(measurement result: NG).
Max. color difference 35
Min. color difference 15
Measurement
region
Edge detection point
Measurement
region
If the value is below the edge level within the
specified width, it is considered as noise.
Noise width (pixels)
Edge level50%
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