centre point for a closed contour

centre point for a closed contour

Post by yong » Tue, 25 Apr 2006 16:17:51


I am reconstructing a 3-D model for human abdominal artery. I try to
find the center point at each 2-D contour image. Although the contour
is closed, it is not regular circle. I want to know how to define the
centre point and which algorithm can find the center point fastly?
 
 
 

centre point for a closed contour

Post by Ken Haga » Tue, 25 Apr 2006 18:13:27


I imagine you are free to define "centre" largely as you please,
though there may well be the constaint that the locus of centres
for your artery should be continuous if the locus of contours is
continuous.

One reasonable definition would be the centre of mass. I strongly
suspect it has the continuity property, though I lack the linguistic
talents to explain why in a pithy one-liner.

As for the fastest algorithms, this will depend almost entirely on
the manner in which the contour is described. For all I know, you
may be relatively free to choose that, too.