[Insight-users] Bubble making

[Luis Ibanez]

Hi Carlos,

Here are two other suggestions:


A) Using FastMarchingImageFilter

1) Set seed points in the centers of the places
    where you want the bubbles.

2) Set their initial values proportional to the
    radius that you want on each bubble.

3) Run the FastMarching image filter up to a certain
    StoppingValue.

4) Threshold the output with a BinaryThresholdImageFilter

That should produce a binary image with spheres centered
in the seed points and radii proportional to the initial
values.

This is one of the methods we use for initializing
level sets.



B)  Using distance maps

1)  Set the image to zero

2)  Set to 1 all the pixels in the locations where you
     want the centers of the spheres

3) Run a Maurer distance map filter

4) Threshold the output a the values of the radii that you
    want.

Unfortunately this will give you only sphere of all the
same radius.



     Regards,


         Luis



--------------------------------
Carlos Sánchez Mendoza wrote:
> Hi all,
>  
> I am developing a bubble making module to create label images made of 
> overlapping spheres using points and radii sets. What I do now is I 
> iterate evaluating one SphereSpatialFunction for each center-radius set 
> along the whole size of my label image. It takes really long. One idea 
> is to iterate only inside each of the spheres bounding cube. Another 
> idea is to use a smart iterator that only looks where it needs to look 
> (I think itk::FloodFilledFunctionConditionalIterator does that) and then 
> ends (for each sphere function).
>  
> Any suggestions? does that sound correct?
>  
> Thank you.
>  
> Carlos S. Mendoza
> Universidad de Sevilla
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users