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| ==LandmarkBasedTransformInitializer.cxx==
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}} |
| <source lang="cpp">
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| #include "itkImageFileWriter.h"
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| #include "itkImage.h"
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| #include "itkVector.h"
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| #include "itkResampleImageFilter.h"
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| #include "itkLandmarkBasedTransformInitializer.h"
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| #include "itkRigid2DTransform.h"
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| | |
| const unsigned int Dimension = 2;
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| typedef unsigned char PixelType;
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| typedef itk::Image< PixelType, Dimension > ImageType;
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| | |
| static void CreateFixedImage(ImageType::Pointer image);
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| static void CreateMovingImage(ImageType::Pointer image);
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|
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| int main(int argc, char * argv[])
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| { | |
| typedef float VectorComponentType;
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| | |
| typedef itk::Vector< VectorComponentType, Dimension > VectorType;
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| typedef itk::Image< VectorType, Dimension > DeformationFieldType;
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| | |
| ImageType::Pointer fixedImage = ImageType::New();
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| CreateFixedImage(fixedImage);
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|
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| ImageType::Pointer movingImage = ImageType::New();
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| CreateMovingImage(movingImage);
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| | |
| typedef itk::Rigid2DTransform< double > Rigid2DTransformType;
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| typedef itk::LandmarkBasedTransformInitializer< Rigid2DTransformType, ImageType, ImageType >
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| LandmarkBasedTransformInitializerType;
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|
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| LandmarkBasedTransformInitializerType::Pointer landmarkBasedTransformInitializer =
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| LandmarkBasedTransformInitializerType::New();
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| // Create source and target landmarks.
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| typedef LandmarkBasedTransformInitializerType::LandmarkPointContainer LandmarkContainerType;
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| typedef LandmarkBasedTransformInitializerType::LandmarkPointType LandmarkPointType;
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| | |
| LandmarkContainerType fixedLandmarks;
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| LandmarkContainerType movingLandmarks;
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| | |
| LandmarkPointType fixedPoint;
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| LandmarkPointType movingPoint;
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| | |
| fixedPoint[0] = 10;
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| fixedPoint[1] = 10;
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| movingPoint[0] = 50;
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| movingPoint[1] = 50;
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| fixedLandmarks.push_back( fixedPoint );
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| movingLandmarks.push_back( movingPoint );
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| | |
| fixedPoint[0] = 10;
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| fixedPoint[1] = 20;
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| movingPoint[0] = 50;
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| movingPoint[1] = 60;
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| fixedLandmarks.push_back( fixedPoint );
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| movingLandmarks.push_back( movingPoint );
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| | |
| fixedPoint[0] = 20;
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| fixedPoint[1] = 10;
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| movingPoint[0] = 60;
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| movingPoint[1] = 50;
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| fixedLandmarks.push_back( fixedPoint );
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| movingLandmarks.push_back( movingPoint );
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| | |
| fixedPoint[0] = 20;
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| fixedPoint[1] = 20;
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| movingPoint[0] = 60;
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| movingPoint[1] = 60;
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| fixedLandmarks.push_back( fixedPoint );
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| movingLandmarks.push_back( movingPoint );
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| | |
| landmarkBasedTransformInitializer->SetFixedLandmarks( fixedLandmarks );
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| landmarkBasedTransformInitializer->SetMovingLandmarks( movingLandmarks );
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|
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| Rigid2DTransformType::Pointer transform = Rigid2DTransformType::New();
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|
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| transform->SetIdentity();
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| landmarkBasedTransformInitializer->SetTransform(transform);
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| landmarkBasedTransformInitializer->InitializeTransform();
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|
| |
| typedef itk::ResampleImageFilter<ImageType, ImageType, double > ResampleFilterType;
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| ResampleFilterType::Pointer resampleFilter = ResampleFilterType::New();
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| resampleFilter->SetInput( movingImage );
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| resampleFilter->SetTransform( transform );
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| resampleFilter->SetSize( fixedImage->GetLargestPossibleRegion().GetSize() );
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| resampleFilter->SetOutputOrigin( fixedImage->GetOrigin() );
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| resampleFilter->SetOutputSpacing( fixedImage->GetSpacing() );
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| resampleFilter->SetOutputDirection( fixedImage->GetDirection() );
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| resampleFilter->SetDefaultPixelValue( 200 );
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| resampleFilter->GetOutput();
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| | |
| // Write the output
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetInput ( resampleFilter->GetOutput() );
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| writer->SetFileName( "output.png" );
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| writer->Update();
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|
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| return EXIT_SUCCESS;
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| }
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| | |
| void CreateFixedImage(ImageType::Pointer image)
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| {
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| // Create a black image with a white square
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| ImageType::IndexType start;
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| start.Fill(0);
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|
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| ImageType::SizeType size;
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| size.Fill(100);
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|
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| ImageType::RegionType region;
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| region.SetSize(size);
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| region.SetIndex(start);
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|
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| image->SetRegions(region);
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| image->Allocate();
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| image->FillBuffer(0);
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|
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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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|
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| while(!imageIterator.IsAtEnd())
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| {
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| if(imageIterator.GetIndex()[0] > 10 && imageIterator.GetIndex()[0] < 20 &&
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| imageIterator.GetIndex()[1] > 10 && imageIterator.GetIndex()[1] < 20)
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| {
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| imageIterator.Set(255);
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| }
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| ++imageIterator;
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| }
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| | |
| // Write the deformation field
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetInput ( image );
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| writer->SetFileName( "fixed.png" );
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| writer->Update();
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| }
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| | |
| | |
| void CreateMovingImage(ImageType::Pointer image)
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| {
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| // Create a black image with a white square
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| ImageType::IndexType start;
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| start.Fill(0);
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|
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| ImageType::SizeType size;
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| size.Fill(100);
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|
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| ImageType::RegionType region;
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| region.SetSize(size);
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| region.SetIndex(start);
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|
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| image->SetRegions(region); | |
| image->Allocate();
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| image->FillBuffer(0);
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|
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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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|
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| while(!imageIterator.IsAtEnd())
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| {
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| if(imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 60 &&
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| imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 60)
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| {
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| imageIterator.Set(100);
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| }
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| ++imageIterator;
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| }
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| | |
| // Write the deformation field
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| typedef itk::ImageFileWriter< ImageType > WriterType;
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| WriterType::Pointer writer = WriterType::New();
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| writer->SetInput ( image );
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| writer->SetFileName( "moving.png" );
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| writer->Update();
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| }
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| | |
| </source>
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| | |
| ==LandmarkBasedTransformInitializer.py==
| |
| <source lang="python">
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| #!/usr/bin/env python
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| | |
| import itk
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| | |
| Dimension = 2
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| PixelType = itk.ctype('unsigned char')
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| ImageType = itk.Image[PixelType, Dimension]
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| | |
| def CreateFixedImage(image):
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| start = itk.Index[Dimension]()
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| start.Fill(0)
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| | |
| size = itk.Size[Dimension]()
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| size.Fill(100)
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| region = itk.ImageRegion[Dimension]()
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| region.SetSize(size)
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| region.SetIndex(start)
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| image.SetRegions(region)
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| image.Allocate()
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| image.FillBuffer(0)
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| | |
| index = itk.Index[Dimension]()
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| for ii in range(10, 20):
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| for jj in range(10, 20):
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| index[0] = ii
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| index[1] = jj
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| image.SetPixel(index, 255)
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| | |
| writer = itk.ImageFileWriter.New(Input=image)
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| writer.SetFileName("fixed.png")
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| writer.Update()
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| | |
| def CreateMovingImage(image):
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| start = itk.Index[Dimension]()
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| start.Fill(0)
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| | |
| size = itk.Size[Dimension]()
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| size.Fill(100)
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| region = itk.ImageRegion[Dimension]()
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| region.SetSize(size)
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| region.SetIndex(start)
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| image.SetRegions(region)
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| image.Allocate()
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| image.FillBuffer(0)
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| | |
| index = itk.Index[Dimension]()
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| for ii in range(50, 60):
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| for jj in range(50, 60):
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| index[0] = ii
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| index[1] = jj
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| image.SetPixel(index, 100)
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| | |
| writer = itk.ImageFileWriter.New(Input=image)
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| writer.SetFileName("moving.png")
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| writer.Update()
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| | |
| fixed_image = ImageType.New()
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| CreateFixedImage(fixed_image)
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| | |
| moving_image = ImageType.New()
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| CreateMovingImage(moving_image)
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| | |
| VectorComponentType = itk.ctype('float')
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| VectorType = itk.Vector[VectorComponentType, Dimension]
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| DisplacementFieldType = itk.Image[VectorType, Dimension]
| |
| | |
| Rigid2DTransformType = itk.Rigid2DTransform[itk.D]
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| landmark_based_transform_initializer = \
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| itk.LandmarkBasedTransformInitializer[itk.Transform[itk.D, Dimension,
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| Dimension]].New()
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| | |
| LandmarkPointType = itk.Point[itk.D, Dimension]
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| LandmarkContainerType = itk.vector[LandmarkPointType]
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| | |
| fixed_landmarks = LandmarkContainerType()
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| moving_landmarks = LandmarkContainerType()
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| | |
| fixed_point = LandmarkPointType()
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| moving_point = LandmarkPointType()
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| | |
| fixed_point[0] = 10
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| fixed_point[1] = 10
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| moving_point[0] = 50
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| moving_point[1] = 50
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| fixed_landmarks.push_back(fixed_point)
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| moving_landmarks.push_back(moving_point)
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| | |
| fixed_point[0] = 10
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| fixed_point[1] = 20
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| moving_point[0] = 50
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| moving_point[1] = 60
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| fixed_landmarks.push_back(fixed_point)
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| moving_landmarks.push_back(moving_point)
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| | |
| fixed_point[0] = 20
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| fixed_point[1] = 10
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| moving_point[0] = 60
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| moving_point[1] = 50
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| fixed_landmarks.push_back(fixed_point)
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| moving_landmarks.push_back(moving_point)
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| | |
| fixed_point[0] = 20
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| fixed_point[1] = 20
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| moving_point[0] = 60
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| moving_point[1] = 60
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| fixed_landmarks.push_back(fixed_point)
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| moving_landmarks.push_back(moving_point)
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| | |
| landmark_based_transform_initializer.SetFixedLandmarks(fixed_landmarks)
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| landmark_based_transform_initializer.SetMovingLandmarks(moving_landmarks)
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| | |
| transform = Rigid2DTransformType.New()
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| transform.SetIdentity()
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| landmark_based_transform_initializer.SetTransform(transform)
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| landmark_based_transform_initializer.InitializeTransform()
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| | |
| resampler = itk.ResampleImageFilter.New(Input=moving_image)
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| resampler.SetTransform(transform)
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| # resampler.SetReferenceImage(fixed_image)
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| resampler.SetSize(fixed_image.GetLargestPossibleRegion().GetSize())
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| resampler.SetOutputOrigin(fixed_image.GetOrigin())
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| resampler.SetOutputSpacing(fixed_image.GetSpacing())
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| resampler.SetOutputDirection(fixed_image.GetDirection())
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| resampler.SetDefaultPixelValue(200)
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| resampler.UpdateLargestPossibleRegion()
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| | |
| writer = itk.ImageFileWriter.New(Input=resampler.GetOutput())
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| writer.SetFileName("output.png")
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| writer.UpdateLargestPossibleRegion()
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| </source>
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| {{ITKCMakeLists|{{SUBPAGENAME}}}}
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