AIMS shape moment on disconnected objects in same volume
Posted: Tue Jun 05, 2007 7:51 pm
Hi Dr. Mangin,
I wanted to ask you a fairly basic question about your BrainVisa program, more specifically with the AIMS shape moment command. If you have a binary volume of 3 disconnected objects (with the same label), how does aims/vip calculate the moment features? Does it calculate each object separately and then find the shape moments/moment invariants and subsequently averages it to output one table of features? Is there a way to calculate the shape properties separately without changing the label for each of the 3 disconnected objects?
Also, in your brain morphometry analysis with 3D shape moments you only took into consideration the invariant moment features...not the other shape moment features (i.e. nu2xy, etc) right? And the reasoning was that the other shape moment features would have a large degree of variation for a same object that was had been modified via translation/rotation?
Thanks again,
Shishir
I wanted to ask you a fairly basic question about your BrainVisa program, more specifically with the AIMS shape moment command. If you have a binary volume of 3 disconnected objects (with the same label), how does aims/vip calculate the moment features? Does it calculate each object separately and then find the shape moments/moment invariants and subsequently averages it to output one table of features? Is there a way to calculate the shape properties separately without changing the label for each of the 3 disconnected objects?
Also, in your brain morphometry analysis with 3D shape moments you only took into consideration the invariant moment features...not the other shape moment features (i.e. nu2xy, etc) right? And the reasoning was that the other shape moment features would have a large degree of variation for a same object that was had been modified via translation/rotation?
Thanks again,
Shishir