Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.


Anu
Posts:
64
Registered:
2/22/05


Re: Alignment of 3D Points
Posted:
Dec 15, 2012 10:43 AM


"Matt J" wrote in message <kafkp8$83i$1@newscl01ah.mathworks.com>... > "Anusha " <anusha@cs.usm.my> wrote in message <kafjg0$3ta$1@newscl01ah.mathworks.com>... > > > > Actually what I need to do is aligning A and B into a standard coordinate system. When I say aligning to the centroid, it means that during aligning A and B to standard coordinate, maybe the centroid of either A or B can be utilized to give the center of gravity for alignment. Hope Im making myself clear. > ============ > > No, I'm afraid not. What makes you think A and B aren't already measured in the same coordinate system right now? After all, they're already both in R^3 and R^3 is a pretty standard coordinate system. > > Is A a transformation of B? If so, what does that transformation look like and why aren't there the same number of points before and after the transformation?
Actually A and B represents points on a surface of medical structure. Capturing the medical structure at different time wil not provide an aligned point set representastion. I have checked this, and the structure A and B are not aligned at the same axis. thts why I need to aligned them to a common axis/center of gravity so tht further processing can be done.



