How to find out contour/boundary of binary 3D image

Hello

I would like to find out the boundary of a 3D MR binary image in matlab. Is there any built in function in matlab to do that.

Answer 1

[Ahmet Cecen]

No direct built in function that I know off. Use circshift to extract them in N Dimensions. If A is your data and I want to find the boundary as the first pixel inside the phase defined by 1s, do something like:

 AX = circshift(A,[1 0 0]);
 Xbound = AX-A;

If you do this in a dummy 1 or 2D case you can see what Xbound gives you and convince yourself about what to do with it.