[Insight-users] GeodesicActiveContours still an unsolved problem

[Juan Cardelino]

Hello Ella,
                 The fast marching filter receives as input a list of points
or seeds. It computes the distance map to those seed points. If you compute
the initial level set outside your program you need to do the following. I'm
assuming you have the initial level set in a ini.mha file. Just read this
image and use it as input of the GAC filter.


        smoothing->SetInput([itkImage itkImporter]->GetOutput() );

gradientMagnitude->SetInput( smoothing->GetOutput() );

sigmoid->SetInput( gradientMagnitude->GetOutput() );

reader->SetFilenName("ini.mha");



geodesicActiveContour->SetInput( reader->GetOutput() );

geodesicActiveContour->SetFeatureImage( sigmoid->GetOutput() );



On Mon, Feb 14, 2011 at 11:33 AM, Ella Maria Kadas <ella_kadas at yahoo.com>wrote:

> I still don't really understand what does FastMarchingFilter get as input.
> I tried the FastMarchingFilter example from ITK/Segmentation and i don't see
> how providing only the output of the Sigmoid Filter and seed points i only
> get a black image.
> I tried to use the SignedDanielssonDistanceFilter and the Image that i get
> from it looks pretty good. so i used
>
>
>
>         smoothing->SetInput([itkImage itkImporter]->GetOutput() );
>
> gradientMagnitude->SetInput( smoothing->GetOutput() );
>
> sigmoid->SetInput( gradientMagnitude->GetOutput() );
>
>  geodesicActiveContour->SetInput( distanceMap->GetOutput() );
>
> geodesicActiveContour->SetFeatureImage( sigmoid->GetOutput() );
>
>  thresholder->SetInput( geodesicActiveContour->GetOutput() );
>
> and update the threshold.
>
> But the result is still a black image. Any ideea what am i still doing so
> wrong.
>
> Thanks in advance,
>
>    Ella
>
>
>
>
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