Panasonic PV-500, User Manual, Page: 195 / 494

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When Detect Mode is "Measure Width", two edges are detected with one cell.
The following is the example that the start point of the area is regarded as the position at six o'clock.
Condition
0
Conditi
on 1
Scan Method
-> -> Condition 0 and 1 scans edges in the same
direction.
Edges are scanned in the direction of three
o'clock from nine o'clock with Condition 0. Then,
edges are scanned with Condition 1 from the
edge detection point of Condition 0.
<- <- Condition 0 and 1 scans edges in the same
direction. Edges are scanned in the direction of
nine o'clock from three o'clock with Condition 0.
Then, edges are scanned with Condition 1 from
the edge detection point of Condition 0.
-> <-
Condition 0 and 1 scans edges in opposite
directions. Edges are scanned in the direction
of three o'clock from nine o'clock with Condition
0, and in the direction of nine o'clock from three
o'clock with Condition 1.
<- -> Condition 0 and 1 scans edges in opposite
directions. Edges are scanned in the direction
of nine o'clock from the center of a cell. Then,
edges are scanned with Condition 1 in the
direction of three o'clock from the edge
detection point of Condition 0.
3.
Set "Scan Method", "Edge Condition", "Edge Threshold" and "Detect Position".
These edge detect conditions are the same as Gray Edge checker. Refer to page 110.
[Scan Method]: Projection / Single
[Edge Condition]: Both / Light -> Dark / Dark-> Light
[Edge Threshold]: Default: 50
[Detect Position]: Front / Peak / Rear
[Filter], [Width], [Average Range] (Only when selecting "Single".)
4.
Press the TRIG key to run a test and confirm if the edges to detect the approximate line are
detected.
How to read graphs when setting thresholds
It is the same as Smart Edge (Circle). Refer to page 170. However, the horizontal axis of the graph for Smart
Edge (Line) is cell numbers.
Setting Approximate Line Detect Condition
Set the method for detecting an approximate line. Set "Detection Method", "Edge ratio used" and "Execution
Mode".
1.
Select “Approximate Line Detect Condition” > "Detection Method".
This is a parameter to decide whether or not to use all the edge coordinates detected by each cell for
calculating an approximate line.
General Mode:
Detects an approximate line using all edge coordinates.
However, if there is a projection or concave in the detected area, the approximate line may shift as the
edge coordinates in those parts are also used for the detection.