[vtkusers]ask about vtkIterativeClosestPointTransform

[John Doe]

i want to do 2d medical image registration on two images and i think i can use vtkIterativeClosestPointTransform to find the correspondence point between the two images. the first question is can i use the images as input? because i read that the input must be vtkPolyData type.
i have tried it but still fail to get the right result..

please help me..
this is part of my code(still wrong)

//
    vtkRenderer *aRenderer = vtkRenderer::New();
    vtkRenderWindow *renWin = vtkRenderWindow::New();
    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    renWin->AddRenderer(aRenderer);
    iren->SetRenderWindow(renWin);       

    vtkDICOMImageReader *source=vtkDICOMImageReader::New();
    source->SetFileName("source.dcm");
    source->Update();

    vtkDICOMImageReader *target=vtkDICOMImageReader ::New();
    target->SetFileName("target.dcm");
    target->Update();

             vtkIterativeClosestPointTransform*icp=vtkIterativeClosestPointTransform::New();
    icp->SetSource(source->GetOutput());
    icp->SetTarget(target->GetOutput());
   
    /////////dont understand these parts!! i just copied it from the references i found
    icp->SetCheckMeanDistance(1);
    icp->SetMaximumMeanDistance(0.01);
    icp->SetMaximumNumberOfIterations(30);
    icp->SetMaximumNumberOfLandmarks(50);
    icp->GetLandmarkTransform()->SetModeToRigidBody();
    icp->CheckMeanDistanceOn();
    icp->StartByMatchingCentroidsOn();
    icp->Update();
    /////////////////////////////////

    vtkTransformPolyDataFilter *filter=vtkTransformPolyDataFilter::New();
    filter->SetTransform(icp);
    filter->SetInput(source->GetOutput());
    

    vtkPolyDataMapper *map=vtkPolyDataMapper::New();
    map->SetInput(filter->GetOutput());

    vtkActor *actor=vtkActor::New();
    actor->SetMapper(map);

    aRenderer->AddActor(actor);

    renWin->Render();
    iren->Start();
//



thanx a lot =)

Regards, John.

       
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