Finding Centroids in 3D using Regionprops

I have a 3d binary segmentation result (logical array) in which there are a bunch of spheres (24 in number). I want to find their centroids. I used regionprops to find the centroids of these spheres as shown below

regionprops(image3D,'Centroid')

I do get a output which is a structure containing 3000 centroids which are all (NaN,NaN,NaN). I also tried to typecast image3D into double & uint8. Didnt work. Any suggestions welcome :-) Thanks. PS: Some of my slices have multiple spheres making it a little harder.

Answer 1

[CJR]

Are you using the bwconncomp function before regionprops? Do you have any noise in the images?

This is what I do:

cc=bwconncomp(image3D); centers=cell2mat(struct2cell(regionprops(cc,'Centroid')))