[Insight-users] how to use ReinitializeLevelSetImageFilter

[Luis Ibanez]

Hi Baoyun,

The SignedDanielssonDistanceMapFilter computes the signed
distance map to the border of a binary mask, and do so for
the entire image domain.

The ReinitializeLevelSetImageFilter computes the signed distance
to the Zero set represented in an input level set image, and do so
only for a narrow band of pixels around the zero set.  The default
width of the narrow band is 12.0.


BTW: Please note that the SignedMaurerDistanceMapFilter
will run faster than the SignedDanielssonDistanceMapFilter.



    Regards,


         Luis



--------------------------------------------------------------------------------------
On Tue, Mar 2, 2010 at 12:03 PM, Baoyun Li <baoyun_li123 at yahoo.com> wrote:

> Dear Luis:
>
> Can you please tell me what is the major differnce between
> SignedDanielssonDistanceMapImageFilter and ReinitializeLevelSetImageFilter.
>
> I have previously successul used SignedDanielssonDistanceMapImageFilter.
> Can I use it for leveselt reinitialization.
>
> Thanks and my best regards
>
> Baoyun
> --- On *Mon, 3/1/10, Luis Ibanez <luis.ibanez at kitware.com>* wrote:
>
>
> From: Luis Ibanez <luis.ibanez at kitware.com>
> Subject: Re: [Insight-users] how to use ReinitializeLevelSetImageFilter
> To: "Baoyun Li" <baoyun_li123 at yahoo.com>
> Cc: insight-users at itk.org
> Date: Monday, March 1, 2010, 11:50 PM
>
>
> Hi Baoyun,
>
>
> It looks like you missed to call the method:
>
>                   SetLevelSetValue()
>
> before you called Update() in the filter.
>
> For guidance, please look at the file:
>
>     Insight/Testing/Code/Algorithms/
>           itkReinitializeLevelSetImageFilterTest.cxx
>
>
>        Regards,
>
>
>               Luis
>
>
> ------------------------------------------------------
> On Mon, Mar 1, 2010 at 2:56 PM, Baoyun Li <baoyun_li123 at yahoo.com<http://us.mc1110.mail.yahoo.com/mc/compose?to=baoyun_li123@yahoo.com>
> > wrote:
>
>>   Dear All:
>>
>> I tried to use ReinitializeLevelSetImageFilter. The output looks weird to
>> me.
>>
>> The input to the filter is binary image binary image with float type
>> (255 as forground, 0 as background).
>>
>> I tried narroow band on and off. However, the output of this filter gives
>> very high value (10^38) for voxles inside the binary mask. Almost all the
>> outside mask voxels has value zero.
>>
>> Below is my code, can somebody tell where I made mistake.
>>
>> Baoyun
>>
>>
>> **************************code************************
>>    typedef typename itk::ReinitializeLevelSetImageFilter< FeatureImageType
>> > DistanceFilterType;
>>    typename DistanceFilterType::Pointer DistanceFilter =
>> DistanceFilterType::New();
>>    DistanceFilter->SetInput( thresholder->GetOutput() );
>>   // DistanceFilter->NarrowBandingOn();
>>   // DistanceFilter->SetNarrowBandwidth( 10 );
>>       try
>>     {
>>       DistanceFilter->Update();
>>     }
>>     catch( itk::ExceptionObject & excep )
>>     {
>>     std::cerr << "Exception caught !" << std::endl;
>>     std::cerr << excep << std::endl;
>>     }
>>
>>   m_levelset2=DistanceFilter->GetOutput();
>>
>> ****************code end*************************
>>
>>
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