Panasonic PV500 User Manual page 115

Edge Condition (Light -> Dark/ Dark-> Light/ Both)
Light ->Dark
Detects a pixel that changes from
high gray to lower gray (or from
light to dark).
Edge Threshold: 1 - 255
This is a condition on contrast or bright differential of an edge to detect. Setting it to larger extracts only
edges with high contrast and lower extracts also low contrast edges. Quantified value of the contrast is
differential value.
Example)
When edge threshold=30, the edge A and B are extracted.
When edge threshold=50, only the edge B is extracted.
Detected Position (Front / Peak / All / Front/ Rear)
Among the edges meeting the condition, decides which edges to output.
Scans from the (arc) start point and detects the first edge. In
Front
the right figure, A is detected.
I Detects the position having the highest absolute differential
Peak
value as an edge. In the right figure, A is detected.
Detects all edges which meet the condition. In the right
All
figure, all edges A, B, C, and D are detected.
Detects the two points, the nearest position from the (arc)
Front/ Rear
start point and from the (arc) end point. In the right figure, A
and D are detected.
Scan Pitch (only for Plane scan)
With this item, set amount of scan skipping. As you set
larger value, the skipping pitch increases. If you have
enough inspection time to spend, use default value, 1.
Filter and Width
These functions allow checkers to ignore undesired objects in front (in the start point side) of the area to detect.
If the undesired objects are detected by running a test, increase the "Width" value.
In addition of above, if the detect object is other than a straight line, including round and pointed object,
increase both "Width" and "Filter" values.
Dark-> Light
Detects a pixel that changes from
low gray to high gray (or from
dark to light).
Scan Pitch=1
Both (default)
Detects a pixel that changes both
from light to dark and from dark
to light.
Edge A- Edge B-
Differential: -40 Differential: -80
Scan Pitch=2
113