Omron F250-UME Software Manual page 275

Detecting Binary Defects
Example: When noise level is set to 30
Edge
detection
region
Edge
detection
region
Noise Width
Set the noise width between 0 and 255 to evaluate noise.
If the density distribution from the position where the edge was first detected
falls to below the edge level within the noise width range, the detected point is
judged as noise. Normally the default noise width setting of 0 is sufficient. If
noise is causing incorrect detection, make this value higher.
Example
Edge detection point
Measurement
region
Noise width (pixel)
50%
Offset Width
Set the adjustment width (in pixel units) for the detected edge position. Set a
value between -511 and 511.
The default setting is 0, which means measurement will start from position
where the edge is detected.
Offset width
Edge detection point
Left and right edges: Set the offset width on the X axis.
Max. density 60
60 15
Edge detected so
Min. density 15
measurement performed
Max. density 25
25 10
Min. density 10 Processed as no edge detected.
Measurement result: NG
If the density falls below the
edge level within the set range,
the detected edge is
determined to be noise.
Edge level
Section 2-12
30
30
2-12-(32)