[Insight-users] Question about pipeline with Geodesic Active Contour

[Luis Ibanez]

Hi Onezero,

The GeodesicActiveContours doesn't really need you to provide a
level set that has been initialized with a distance function.
You can pass directly your binary image as the input LevelSet.

The speed image seems to be ok, if you are building it by taking
the Sigmoid of the Gradient magnitude.

Please refer to the multiple examples on LevelSets in the ITK
Software Guide

           http://www.itk.org/ItkSoftwareGuide.pdf

You will find them in the "Segmentation" chapter.


A descriptioin of what a Distance Map is, can also be found
in the ITK Software Guide.  Please not that you don't need
to compute a Distance map for this particular Level Set filter.


    Regards,


       Luis



---------------
OnezerO wrote:
> Hello,
> Please, first i need to know if this pipeline made for segmentation it's 
> theoricly correct
>  
>                        -->CurvatureAnisotropicDiffusionImageFilter-->GradientMagnitudeRecursiveGaussianImageFilter-->SigmoidImageFilter
>                        
> |                                                                                                                                                                
> |
> Original 
> Image--|                                                                                                                                                                
> |
>                        |                                                                                                                                                                
> |
>                        -->BinaryThresholdImageFilter-->SignedDanielssonDistanceMapImageFilter-->DistanceMapImage---------GeodesicActiveContourLevelSetImageFilter
>                                                                                                                                                                                         
> |
>                                                                                                                                                                            BinaryThresholdImageFilter
>                                                                                                                                                                                         |
>                                                                                                                                                                            SegmentationImage
>  
>  
> as a second question i want to know what is a Distance Map and how to 
> "read it", and finally i'm using the methos InsideIsPositiveOn () in the 
> signeddanielsson what's the functionality of this method? is well used 
> in the pipeline
>  
> Any Comments please
>  
> Thanks
>                                                                                                                                                                        
> 
> 
> 
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> 
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