how to find a medial axis?

i am working on Spect images axial slices, i've got an slice and i have the boundaries of the slice how can i find the medial axis of this slice and rotate the whole stack of slices around this axis? thanks

[Sean de Wolski]

Showing us a picture would probably really help.

For rotating, maketform/imtransform

Answer 1

[Image Analyst]

I answered your duplicate in the newsgroup: http://groups.google.com/group/comp.soft-sys.matlab/browse_frm/thread/459c85a82198db33?hl=en#

Answer 2

[niloufar]

dear image analyst thanks for the help, although i had tried your solution and it didn't work completely. here i don't know how i can attach the image here to show you how my slices are.

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

Answer 3

[niloufar]

here you can see the slice:

 <<http://imageshack.us/photo/my-images/842/57981142.jpg>>

i have to find the medial axis of this slice.