[Insight-users] Speed of Fastmarching

[Hui Tang]

Hi Dan,

Thanks for reply! It is in release mode, but I need to wait for 4-5 mins to
generate s distance map from one point, if I increase number of points to
50, I need 3 hours or so, so I guess it is not because of debug/release
version .......................
But I will try Steven's suggestion!

Thanks you all again!

Best,

Hui

On Thu, Feb 23, 2012 at 10:38 PM, Dan Mueller <dan.muel at gmail.com> wrote:

> 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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