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Principle of Flaw Detection function
A Flaw Detection checker is executed in either of the following inspection modes.
If the PV310 failed to detect any flaw after testing in Differential mode, try to test again after switching to Gray
Range mode. It is effective when you let the PV310 inspect the object surface of uneven brightness, but it will
take longer time to process the image in Gray Range mode than in Differential mode.
*Example of uneven brightness
If the inspection mode = "Differential"
Process description
Creates rectangular areas (, which are called
cells) of any size within the inspection area and
calculates the brightness of each area (average
gray value).
Calculates the average brightness of the cells
before and after the cell in the object. If the
calculated average brightness of the cells is
more than the "threshold value" you will set later,
the PV310 extracts the cell as a candidate flaw
(see the figure shown on the right).
As you increase the threshold value, the PV310
regards the area of larger difference in
brightness as a candidate flaw, whereas as you
decrease the threshold value, the PV310 regards
even an area having slight difference in
brightness as a candidate flaw.
The PV310 judges whether the candidate flaw is
regarded as a flaw based on the number of the
cells in the candidate flaw or not. If the number of
cells in the candidate flaw is more than the
number of cells that have been set as "Flaw
Size", the PV310 judges the cell as a flaw.
Process image
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