Panasonic PV500 User Manual page 116

Average Range
This item decides how many pixels from the detected edge positions are averaged. If the desired position
cannot be detected as a result of the test using the default value, change the Average Range value. Increasing
the Average Range value detects the position slightly inside the edge of the object. Decreasing the value
detects the position on the edges of the object.
To detect a front edge of a circle, pointed or irregular object, set the Average Range value to be low as much as
possible.
Average = 0 The detection position is the edge position on the tip of the
detected part. (In the example on the right, the detection
position is located on the bottom line.)
Average = 1 The coordinate values of the edge on the tip of the detected
part are averaged. (In the example on the right, the tip edge is
located on the line 105. Thus, the coordinate values of the
edge on the lines from 105.0 to 105.9 are averaged.)
Average = 2 The coordinate values of the edges located between on the
tip line and on the next line are averaged. (In the example on
the right, the tip edge is located on the line 105. Thus, the
coordinate values of the edge on the lines from 105.0 to 106.9
are averaged.)
If you set the Average Range value to 1 or more, Y coordinate of the horizontal scan and X coordinate of the
vertical scan will be averaged as well.
Setting Judgement Limits
Set a tolerance (Maximum and Minimum values) of the number of detected edges. If the number of detected
edges is within the tolerance, the object will be judged as "OK", if it is out of it, the object is judged as "NG".
1.
Select "Judgement Limits".
2.
Input the setting values for "OK Judge. Max." and "OK Judge. Min".
3.
After inputting is completed, press the CANCEL key.
Running a Test and Confirming Result
Confirm if the current settings perform an inspection properly. To observe the image easily, set "Window
Transparency (SETUP menu)" to larger value. ("Changing Window Transparency (SETUP Menu)", page 341)
1.
Press the TRIG key.
When a live image is displayed on the screen, PV captures a new image first and runs a test. When a
memory image is displayed, it runs a test using the current memory image without capturing any images.
Position adjustment and area size adjustment are also executed at the same time if they are used.
2.
Confirm a judgement result and the number of detected objects.
The list of detected edges is displayed in the lower part of the setting window.
When selecting this table and highlighting an edge data, the mark on the screen window indicating the
detect position turns to red.
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