Hi, I am a computer science student working on a FTIR Do-It-Yourself Multitouch-Table at university. >From reading many papers about multitouch I know about a capacitive system called DiamondTouch where this effect also happens and is called “shadowing”. At the “Internation Tabletops and Surfaces 2009″ conference a paper by Berard and Laurillau was published that tries to solve that. Take a look at it: http://iihm.imag.fr/publs/2009/ITS2009_Berard_DTMultiTouch.pdf On page 2 figure 2 you will find an image showing exactly the same problem and the text also describes why this happens. If you further search Google for DiamondTouch and how this works you will understand the problem and that it is indeed caused by the hardware. I didn't read the papers in detail but I think it can't be completely solved by software workarounds (I consider that nobody would write papers about it if the problem was solved ;) ).
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