Omron FQ User Manual page 64

Unstable Edge Position Results
There Is an Edge But It Cannot Be Detected
[Inspect] − [Edge Position] − [Modify] − [Details] Tab Page
Parameter
Edge level
Note
Edge Level
An edge is detected in the following way.
1. The color change distribution of the entire measurement region is determined.
2. The minimum color change is 0%. The maximum color change is 100%.
3. The location where the color change intersects with the edge level is detected as the edge.
Measurement
region
Noise Is Mistaken as an Edge
[Inspect] − [Edge Position] − [Modify] − [Details] Tab Page
Parameter
Noise level
Note
Noise Level
The maximum and minimum color changes within the edge detection region are determined. If the difference
is less than the noise level, it is assumed that there are no edges. Normally there is no problem with the
default value of 10, but if noise is mistakenly detected as an edge, make this value higher.
Within the Region
Max. color change − Min. color change < Noise level → No edge found → Measurement result: NG
Max. color change − Min. color change ≥ Noise level → Edge found → Perform measurement
Measurement
region
60 − 15 > 30
Judges that there is an edge and performs measurements.
60
Inspecting with the Edge Position Inspection Item
Setting Description
Range: 0 to 100 Set the color change level to detect as an edge.
Default: 50 The edge point is found based on a threshold that is set for a color change.
Important
If you change the edge level, perform teaching again.
100%
50%
0%
Setting Description
Range: 0 to 422 Sets the density level to be considered as noise.
Default: 10 If the difference between the maximum and minimum color changes in the
region is below the noise level, it will be assumed that there is no edge.
Increase this value if noise is incorrectly detected as an edge.
Important
If you change the noise level, perform teaching again.
Max. color
change: 60
Min. color
change: 15
Maximum color change
Edge level
Minimum color change
Measurement
region
25 − 10 < 30
Judges that there is no edge (measurement result is NG).
Max. color
change: 25
Min. color
change: 10
FQ User's Manual