<div dir="ltr">Hi Massi,<div><br></div><div>You may want to verify the content of the ITK image, </div><div>before it is passed to convert to a vtkImageData.</div><div><br></div><div>For example, save it into a file, and review its content</div>
<div>with an image viewer.</div><div><br></div><div><br></div><div> Regards,</div><div><br></div><div> Luis</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Dec 15, 2013 at 2:53 AM, Massinissa Bandou <span dir="ltr"><<a href="mailto:Massinissa.Bandou@usherbrooke.ca" target="_blank">Massinissa.Bandou@usherbrooke.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Luis,<br>
I modified my code for two 3D vtkImagaData (float). The code is compiling<br>
and I tried to read the output as a vtkImageData but the problem is the<br>
image is empty. (the output has 1 1 1 for the spacing and 0 for number of<br>
cells.)<br>
<br>
<br>
typedef itk::Image<float, 3> ImageType;<br>
<br>
typedef itk::VTKImageToImageFilter<ImageType> VTKToITKConnector;<br>
VTKToITKConnector::Pointer vtk2itksource = VTKToITKConnector::New();<br>
VTKToITKConnector::Pointer vtk2itktarget = VTKToITKConnector::New();<br>
vtk2itksource->SetInput(source); //vtkImageData source<br>
vtk2itktarget->SetInput(target); //vtkImageData target<br>
<br>
ImageType::Pointer fixed = vtk2itksource->GetOutput();<br>
ImageType::Pointer moving = vtk2itktarget->GetOutput();<br>
<br>
fixed->Update();<br>
moving->Update();<br>
<br>
typedef float VectorComponentType;<br>
typedef itk::Vector<VectorComponentType,3> VectorType;<br>
typedef itk::Image<VectorType, 3> DeformationFieldType;<br>
<br>
typedef itk::VersorRigid3DTransform<double> Rigid3DTransformType;<br>
typedef<br>
itk::LandmarkBasedTransformInitializer<Rigid3DTransformType,ImageType,ImageType><br>
LandmarkBasedTransformInitializerType;<br>
<br>
LandmarkBasedTransformInitializerType::Pointer<br>
landmarkBasedTransformInitializer =<br>
LandmarkBasedTransformInitializerType::New();<br>
//Create source and target landmarks.<br>
typedef LandmarkBasedTransformInitializerType::LandmarkPointContainer<br>
LandmarkContainerType;<br>
typedef LandmarkBasedTransformInitializerType::LandmarkPointType<br>
LandmarkPointType;<br>
<br>
LandmarkContainerType fixedLandmarks;<br>
LandmarkContainerType movingLandmarks;<br>
LandmarkPointType fixedPoint;<br>
LandmarkPointType movingPoint;<br>
<br>
fixedPoint[0] = 10;<br>
fixedPoint[1] = 10;<br>
movingPoint[0] = 50;<br>
movingPoint[1] = 50;<br>
fixedLandmarks.push_back( fixedPoint );<br>
movingLandmarks.push_back( movingPoint );<br>
<br>
fixedPoint[0] = 10;<br>
fixedPoint[1] = 20;<br>
movingPoint[0] = 50;<br>
movingPoint[1] = 60;<br>
fixedLandmarks.push_back( fixedPoint );<br>
movingLandmarks.push_back( movingPoint );<br>
<br>
fixedPoint[0] = 20;<br>
fixedPoint[1] = 10;<br>
movingPoint[0] = 60;<br>
movingPoint[1] = 50;<br>
fixedLandmarks.push_back( fixedPoint );<br>
movingLandmarks.push_back( movingPoint );<br>
<br>
fixedPoint[0] = 20;<br>
fixedPoint[1] = 20;<br>
movingPoint[0] = 60;<br>
movingPoint[1] = 60;<br>
fixedLandmarks.push_back( fixedPoint );<br>
movingLandmarks.push_back( movingPoint );<br>
<br>
<br>
<br>
<br>
landmarkBasedTransformInitializer->SetFixedLandmarks(fixedLandmarks);<br>
landmarkBasedTransformInitializer->SetMovingLandmarks(movingLandmarks);<br>
<br>
Rigid3DTransformType::Pointer transform = Rigid3DTransformType::New();<br>
<br>
transform->SetIdentity();<br>
landmarkBasedTransformInitializer->SetTransform(transform.GetPointer());<br>
<div class="im"> landmarkBasedTransformInitializer->InitializeTransform();<br>
<br>
typedef itk::ResampleImageFilter<ImageType, ImageType, double><br>
ResampleFilterType;<br>
ResampleFilterType::Pointer resampleFilter = ResampleFilterType::New();<br>
</div> resampleFilter->SetInput(moving);<br>
resampleFilter->SetTransform(transform);<br>
resampleFilter->SetSize(fixed->GetLargestPossibleRegion().GetSize());<br>
resampleFilter->SetOutputOrigin(fixed->GetOrigin());<br>
resampleFilter->SetOutputSpacing(fixed->GetSpacing());<br>
resampleFilter->SetOutputDirection(fixed->GetDirection());<br>
resampleFilter->SetDefaultPixelValue(200);<br>
resampleFilter->GetOutput();<br>
<br>
//connect to VTK<br>
typedef itk::ImageToVTKImageFilter<ImageType> ConnectType;<br>
ConnectType::Pointer connector = ConnectType::New();<br>
connector->SetInput(fixed);<br>
<br>
vtkImageData *imageData = vtkImageData::New();<br>
imageData->DeepCopy(connector->GetOutput());<br>
<br>
double a[3];<br>
imageData->GetSpacing(a);<br>
cout<<"spacing: "<<a[0]&lt;&lt;&quot; &quot;&lt;&lt;a[1]&lt;&lt;&quot;<br>
&quot;&lt;&lt;a[2]&lt;&lt;endl;<br>
cout&lt;&lt;imageData->GetNumberOfCells()<<endl;<br>
&lt;/h4><br>
<br>
<br>
<br>
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