ITK  4.8.0
Insight Segmentation and Registration Toolkit
WikiExamples/Registration/LandmarkBasedTransformInitializer.cxx
#include "itkImage.h"
#include "itkVector.h"
const unsigned int Dimension = 2;
typedef unsigned char PixelType;
static void CreateFixedImage(ImageType::Pointer image);
static void CreateMovingImage(ImageType::Pointer image);
int main(int argc, char * argv[])
{
typedef float VectorComponentType;
typedef itk::Image< VectorType, Dimension > DeformationFieldType;
ImageType::Pointer fixedImage = ImageType::New();
CreateFixedImage(fixedImage);
ImageType::Pointer movingImage = ImageType::New();
CreateMovingImage(movingImage);
typedef itk::Rigid2DTransform< double > Rigid2DTransformType;
LandmarkBasedTransformInitializerType;
LandmarkBasedTransformInitializerType::Pointer landmarkBasedTransformInitializer =
LandmarkBasedTransformInitializerType::New();
// Create source and target landmarks.
typedef LandmarkBasedTransformInitializerType::LandmarkPointContainer LandmarkContainerType;
typedef LandmarkBasedTransformInitializerType::LandmarkPointType LandmarkPointType;
LandmarkContainerType fixedLandmarks;
LandmarkContainerType movingLandmarks;
LandmarkPointType fixedPoint;
LandmarkPointType movingPoint;
fixedPoint[0] = 10;
fixedPoint[1] = 10;
movingPoint[0] = 50;
movingPoint[1] = 50;
fixedLandmarks.push_back( fixedPoint );
movingLandmarks.push_back( movingPoint );
fixedPoint[0] = 10;
fixedPoint[1] = 20;
movingPoint[0] = 50;
movingPoint[1] = 60;
fixedLandmarks.push_back( fixedPoint );
movingLandmarks.push_back( movingPoint );
fixedPoint[0] = 20;
fixedPoint[1] = 10;
movingPoint[0] = 60;
movingPoint[1] = 50;
fixedLandmarks.push_back( fixedPoint );
movingLandmarks.push_back( movingPoint );
fixedPoint[0] = 20;
fixedPoint[1] = 20;
movingPoint[0] = 60;
movingPoint[1] = 60;
fixedLandmarks.push_back( fixedPoint );
movingLandmarks.push_back( movingPoint );
landmarkBasedTransformInitializer->SetFixedLandmarks( fixedLandmarks );
landmarkBasedTransformInitializer->SetMovingLandmarks( movingLandmarks );
Rigid2DTransformType::Pointer transform = Rigid2DTransformType::New();
transform->SetIdentity();
landmarkBasedTransformInitializer->SetTransform(transform);
landmarkBasedTransformInitializer->InitializeTransform();
ResampleFilterType::Pointer resampleFilter = ResampleFilterType::New();
resampleFilter->SetInput( movingImage );
resampleFilter->SetTransform( transform );
resampleFilter->SetSize( fixedImage->GetLargestPossibleRegion().GetSize() );
resampleFilter->SetOutputOrigin( fixedImage->GetOrigin() );
resampleFilter->SetOutputSpacing( fixedImage->GetSpacing() );
resampleFilter->SetOutputDirection( fixedImage->GetDirection() );
resampleFilter->SetDefaultPixelValue( 200 );
resampleFilter->GetOutput();
// Write the output
WriterType::Pointer writer = WriterType::New();
writer->SetInput ( resampleFilter->GetOutput() );
writer->SetFileName( "output.png" );
writer->Update();
return EXIT_SUCCESS;
}
void CreateFixedImage(ImageType::Pointer image)
{
// Create a black image with a white square
ImageType::IndexType start;
start.Fill(0);
ImageType::SizeType size;
size.Fill(100);
ImageType::RegionType region;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
itk::ImageRegionIterator<ImageType> imageIterator(image,region);
while(!imageIterator.IsAtEnd())
{
if(imageIterator.GetIndex()[0] > 10 && imageIterator.GetIndex()[0] < 20 &&
imageIterator.GetIndex()[1] > 10 && imageIterator.GetIndex()[1] < 20)
{
imageIterator.Set(255);
}
++imageIterator;
}
// Write the deformation field
WriterType::Pointer writer = WriterType::New();
writer->SetInput ( image );
writer->SetFileName( "fixed.png" );
writer->Update();
}
void CreateMovingImage(ImageType::Pointer image)
{
// Create a black image with a white square
ImageType::IndexType start;
start.Fill(0);
ImageType::SizeType size;
size.Fill(100);
ImageType::RegionType region;
region.SetSize(size);
region.SetIndex(start);
image->SetRegions(region);
image->Allocate();
image->FillBuffer(0);
itk::ImageRegionIterator<ImageType> imageIterator(image,region);
while(!imageIterator.IsAtEnd())
{
if(imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 60 &&
imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 60)
{
imageIterator.Set(100);
}
++imageIterator;
}
// Write the deformation field
WriterType::Pointer writer = WriterType::New();
writer->SetInput ( image );
writer->SetFileName( "moving.png" );
writer->Update();
}