[Insight-users] RE : BinaryMask

[Luis Ibanez]

Hi Josiane,


Please read my previous email and the section of the ITK Software Guide
with attention.


The code that you should use to extract the point coordinates is not

      std::ofstream MyOutputFile (argv[1]);
      MyOutputFile << meshSource->GetOutput() << std::endl;




The code that we pointed you to is:

      meshSource->Update();

      const MeshType * mesh = meshSource->GetOutput();

      std::ofstream MyOutputFile( argv[1] );

      PointsIterator  pointIterator = mesh->GetPoints()->Begin();

      PointsIterator end = mesh->GetPoints()->End();

      while( pointIterator != end )
        {
        MeshType::PointType p = pointIterator.Value();
        MyOutputFile << p << std::endl;
        ++pointIterator;
        }


Please use this last section of code for sending the Mesh point
coordinates to a file.


That being said....


Please note, again, that if you want to apply ICP on the mesh,
you *do not* need to extract the point coordinates. The mesh
is a valid input to the PointSetToPointSetRegistrationMethod.



    Regards,


       Luis



-------------------------------------
Yankam Njiwa Josiane Adrienne wrote:
>  
> Hi Luis,
>  
> Thanks a lot for your answers. I had already read the mesh section of the itkSoftwareGuide without finding what i really need.
> I try to use the option you proposed to me by writing the coordinates of the mesh into a file:
> 
>                          std::ofstream MyOutputFile (argv[1]);
> 
>                          MyOutputFile << meshSource->GetOutput() << std::endl;
> 
> I was surprised by the result because i have only one line in the output file. I checked the number of outputs with:
> 
>                          std::cout << meshSource->GetNumberOfOutputs() << std::endl;
> 
> The result gave 1.
>  
> Have i something wrong please in the procedure? 
>  
> Regards,
>  
> Josiane.
> 
> ________________________________
> 
> De: Luis Ibanez [mailto:luis.ibanez at kitware.com]
> Date: mar. 20/05/2008 16:13
> À: Yankam Njiwa Josiane Adrienne
> Cc: insight-users at itk.org
> Objet : Re: [Insight-users] BinaryMask
> 
> 
> 
> 
> Hi Josiane,
> 
> 
> Please read the ITK Software Guide
> 
>       http://www.itk.org/ItkSoftwareGuide.pdf
> 
> In particular section: 4.3 "Mesh" in pdf-page 94.
> 
> You will find examples on how to access the coordinates
> of the Mesh points in page 96.
> 
> 
> The source code example that you should look at is
> 
> 
>     Insight/Examples/DataRepresentation/Mesh/Mesh1.cxx
> 
> 
> in particular, lines 198-224:
> 
> 
>    PointsIterator  pointIterator = mesh->GetPoints()->Begin();
> 
>    PointsIterator end = mesh->GetPoints()->End();
>    while( pointIterator != end )
>      {
>      MeshType::PointType p = pointIterator.Value();
>      std::cout << p << std::endl;
>      ++pointIterator;
>      }
> 
> 
> That, being said,...
> 
> Please note that if you want to proceed to perform ICP
> (Iterative Closest Point), you *do not* need to manually
> extract the point coordinates from the Mesh that is
> produced from the BinaryMask3DMeshSource filter.
> 
> 
> A Mesh derives from the PointSet class, and the input
> to the ICP code is two PointSets.  This means that you
> can simply plug the Mesh as input to the ICP registration.
> 
> 
> Something like:
> 
>    registrationICP->SetFixedPointSet(
>       binaryMask3DMeshSource->GetOutput() );
> 
> 
> 
>    Regards,
> 
> 
>       Luis
> 
> 
> 
> -----------------------------
> Yankam Njiwa Josiane Adrienne wrote:
> 
>>Dear all,
>>
>>I am back with another problem. I ran the test example itkBinaryMask3DMeshSourceTest.cxx, after it i have the number of cells and nodes of the mesh. My question is about a speciific image: How can i create and get the coordinates of mesh by presenting in entry a binary image? My aim is to use these point coordinates in the iterative closestPoint registration framework.
>>
>>Could somebody give me some help please?
>>
>>Regards,
>>
>>Josiane.
>>_______________________________________________
>>Insight-users mailing list
>>Insight-users at itk.org
>>http://www.itk.org/mailman/listinfo/insight-users
>>
> 
> 
> 
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