[Insight-users] Speed of Fastmarching

[Dan Mueller]

Hi Hui,

Also make sure you are compiling your program in Release mode -- this
can improve performance by one or two orders of magnitude.

Cheers, Dan

On 24 February 2012 03:44, Hui Tang <tanghui.seu at gmail.com> wrote:
> Hi All,
>
> I am using itkFastMarchingImageFilter to create a distance map to a set of
> points, this seems like a very basic usage of ITK
>
> //GetNodes
>   seeds->Initialize();
>   for (int i=0;i<seedPoints.size();i++)
>   {
>    ImageType::IndexType seedIndex;
>         input->TransformPhysicalPointToIndex( seedPoints[i],seedIndex);
> NodeType node;
> const double seedValue = 0.0;
> node.SetValue( seedValue );
> node.SetIndex( seedIndex );
> seeds->InsertElement( i, node );
>   }
> //execute fast marching
>   FastMarchingFilterType::Pointer fastMarching =
> FastMarchingFilterType::New();
>   fastMarching->SetInput( input);
>   fastMarching->SetTrialPoints(seeds);
>   fastMarching->SetStoppingValue(2*radius);
>   fastMarching->SetSpeedConstant(1);
>   fastMarching->SetNormalizationFactor(1);
>   fastMarching->SetOutputSize( input->GetBufferedRegion().GetSize() );
>   fastMarching->Update();
>
> This works,but it is extremely slow......I think something went wrong but I
> do not know where.
>
> May I ask did anyne of you also find out this problem?
>
> Thanks a lot!
>
> Best,
>
> Hui
>
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