How does the Centre of mass calculation within the Vision particle analysis function work?

I have been using the particle analysis function to establish the centre of mass of some particles. However on analysis some of the stated CofG's are clearly wrong. Does anybody know why this could be or how you can access the code that performs the calcution to check it?

mattmc wrote in message news:<[email protected]>...
> I have been using the particle analysis function to establish the
> centre of mass of some particles. However on analysis some of the
> stated CofG's are clearly wrong. Does anybody know why this could be
> or how you can access the code that performs the calcution to check
> it?
Hi,
I don't think you can access the code that performs the calculation,
because that is NI's DLL, unless they let you see the source C/C++
code. But I know one algorithm to get the mass center is using the
moments calculation,
m(p,q)=double integral over x^py^qf(x,y)dxdy, and the mass center is:
Xc=m(1,0)/m(0,0), Yc=m(0,1)/m(0,0)
As a matter fact, you can see m(0,0) is actually the area
size of the
particle.
Irene
www.geocities.com/irene_he

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How does the Centre of mass calculation within the Vision particle analysis function work?

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