Omron FQ2-S4 User Manual page 167

Noise Is Mistaken as an Edge
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[Inspect] [Inspection]
[Noise Level]
Parameter Setting
Noise level Sensors with Color Cam-
eras Only
Range: 0 to 422
Default: 5
(Sensors with Mono-
chrome Cameras only)
Range: 0 to 255
Default:128
Note
Noise threshold
The maximum and minimum color deviations and densities within the edge detection region are determined.
If the difference is less than the noise threshold, 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.
• Sensors with Color Camera
Within the Region
Max. color change − Min. color change < Noise threshold → No edge found → Measurement result: NG
Max. color change − Min. color change ≥ Noise threshold → Edge found → Perform measurement
• Sensors with Monochrome Cameras
Max. density change − Min. density change < Noise threshold → No edge found → Measurement result:
NG
Max. density change − Min. density change − Noise threshold → Edge found → Perform measurement
Measurement
region
60 − 15 > 30
Judges that there is an edge and performs measurements.
Screen Display When the Edge Level and Noise Level Are Changing
A bar showing the threshold level moves up and down on the graphic as the edge level/noise level value changes.
A cross-key cursor will also appear at the detected edge position.
Screen display when the edge level are changing.
FQ2-S4 User's Manual
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[Edge Position] [Modify]
Description
Sets the density level to be considered as noise.
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 deviations
and densities: 60
Min. color deviations
and densities: 15
25 − 10 < 30
Judges that there is no edge (measurement result is NG).
Edge level (Blue)
Noise level (Yellow)
Inspecting with the Edge Position Inspection Item
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[Details] Tab Page [Meas. Parameter]
Measurement
region
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Max. color deviations
and densities: 25
Min. color deviations
and densities: 10
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