If you are seeing reflection on the underside of the part, I would first begin with the recommended light levels for the BGA. You should be able to obtain the levels from the Siemens help desk. There is a 2 to 3 page document with levels for a variety of parts.
You can also adjust the transform parameter to further "filter out" the background.
As to whether it anchors off of the corners I beieve this is true and there will be a parameter with which you define the group of balls the vision system will look for at the corners.
The inspection will also look for the indvidual balls.
Reference your manuals for detail concerning how the system is actually able to "diffentiate" the inner part of the ball versus the outer.
I would suggest you look into attending the GF training offered by Siemens since this an good resources.
One other item you may want to get information on is Siemen's Remote Diagnostic option.
Hope this is of help. Nick
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