[Insight-users] Levelset embedding function

[Arnaud Gelas]

Hui,

With all level set discrete representations (dense, sparse Whitaker, 
sparse Shi or sparse Malcolm), the level set function at the last 
iteration (after the evolution) should be the same as the output.

Did you use an observer and a command to save these images? or did you 
modify some piece of code?

Do you save your image at the end of one iteration (after the evolution 
gets done) ?
How do you evaluate the level set function?

Arnaud

On 02/01/2012 08:50 AM, Hui Tang wrote:
> ha Arnaud, thank you for reply.
>
> I am using ITK4.....embedding image is the signed distance image whose 
> zero value shows the current surface.
> I runned a program that combines several itk levelset terms.
> I would like to monitor the surface evolution, so I saved the signed 
> distance image in every n  iteration.
> but I expect the last signed distance image should be the same as the 
> final segmentation, i.e. that one that I got outside ITK classes using 
> the code from ITK example.
>
> Best,
>
> HUi
> On Wed, Feb 1, 2012 at 2:41 PM, Arnaud Gelas <arnaudgelas at gmail.com 
> <mailto:arnaudgelas at gmail.com>> wrote:
>
>     Hi Hui,
>
>     It's not clear to me what you actually mean by "embedding
>     function" / "embedding image" ?
>     This function / image are embedded with respect to which class?
>     What kind of level-set representation are you using?
>
>     Thanks,
>     Arnaud
>
>
>     On 02/01/2012 08:32 AM, Hui Tang wrote:
>>     Dear itk users,
>>
>>      I outputed my intermediate embedding function every n iterations
>>     (I got it inside one of the levelset terms), but  I compare that
>>     with the one  that I got after evolution 
>>     (level_set->GetLabelMap()->GetPixel(idx) ), they are pretty much
>>     different.
>>
>>     Should itk embedding image in the last iteration be the same as
>>     the output embedding image?
>>
>>     Looking forward to your reply.
>>
>>     Best, Hui
>>
>>
>>
>>
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