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#include "itkLandmarkBasedTransformInitializer.h"
#include "itkImage.h"
#include <math.h>
#include <iostream>
//
// The test specifies a bunch of fixed and moving landmarks and test if the
// fixed landmarks after transform by the computed transform coincides
// with the moving landmarks....
int itkLandmarkBasedTransformInitializerTest(int, char * [])
{
const double nPI = 4.0 * vcl_atan( 1.0 );
{
// Test LandmarkBasedTransformInitializer for Rigid 3D landmark
// based alignment
std::cout << "Testing Landmark alignment with VersorRigid3DTransform" << std::endl;
typedef unsigned char PixelType;
const unsigned int Dimension = 3;
typedef itk::Image< PixelType, Dimension > FixedImageType;
typedef itk::Image< PixelType, Dimension > MovingImageType;
FixedImageType::Pointer fixedImage = FixedImageType::New();
MovingImageType::Pointer movingImage = MovingImageType::New();
// Create fixed and moving images of size 30 x 30 x 30
//
FixedImageType::RegionType fRegion;
FixedImageType::SizeType fSize;
FixedImageType::IndexType fIndex;
fSize.Fill(30);
fIndex.Fill(0);
fRegion.SetSize( fSize );
fRegion.SetIndex( fIndex );
MovingImageType::RegionType mRegion;
MovingImageType::SizeType mSize;
MovingImageType::IndexType mIndex;
mSize.Fill(30);
mIndex.Fill(0);
mRegion.SetSize( mSize );
mRegion.SetIndex( mIndex );
fixedImage->SetLargestPossibleRegion( fRegion );
fixedImage->SetBufferedRegion( fRegion );
fixedImage->SetRequestedRegion( fRegion );
fixedImage->Allocate();
movingImage->SetLargestPossibleRegion( mRegion );
movingImage->SetBufferedRegion( mRegion );
movingImage->SetRequestedRegion( mRegion );
movingImage->Allocate();
// Set the transform type..
typedef itk::VersorRigid3DTransform< double > TransformType;
TransformType::Pointer transform = TransformType::New();
typedef itk::LandmarkBasedTransformInitializer< TransformType,
FixedImageType, MovingImageType > TransformInitializerType;
TransformInitializerType::Pointer initializer = TransformInitializerType::New();
// Set fixed and moving landmarks
TransformInitializerType::LandmarkPointContainer fixedLandmarks;
TransformInitializerType::LandmarkPointContainer movingLandmarks;
TransformInitializerType::LandmarkPointType point;
TransformInitializerType::LandmarkPointType tmp;
// Moving Landmarks = Fixed Landmarks rotated by 'angle' degrees and then
// translated by the 'translation'. Offset can be used to move the fixed
// landmarks around.
double angle = 10 * nPI / 180.0;
TransformInitializerType::LandmarkPointType translation;
translation[0] = 6;
translation[1] = 10;
translation[2] = 7;
TransformInitializerType::LandmarkPointType offset;
offset[0] = 10;
offset[1] = 1;
offset[2] = 5;
point[0]=2 + offset[0];
point[1]=2 + offset[1];
point[2]=0 + offset[2];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
point[2] = point[2] + translation[2];
movingLandmarks.push_back(point);
point[0]=2 + offset[0];
point[1]=-2 + offset[1];
point[2]=0 + offset[2];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
point[2] = point[2] + translation[2];
movingLandmarks.push_back(point);
point[0]=-2 + offset[0];
point[1]=2 + offset[1];
point[2]=0 + offset[2];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
point[2] = point[2] + translation[2];
movingLandmarks.push_back(point);
point[0]=-2 + offset[0];
point[1]=-2 + offset[1];
point[2]=0 + offset[2];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
point[2] = point[2] + translation[2];
movingLandmarks.push_back(point);
initializer->SetFixedLandmarks(fixedLandmarks);
initializer->SetMovingLandmarks(movingLandmarks);
initializer->SetFixedImage( fixedImage );
initializer->SetMovingImage( movingImage );
initializer->SetTransform( transform );
initializer->InitializeTransform();
// Transform the landmarks now. For the given set of landmarks, since we computed the
// moving landmarks explicitly from the rotation and translation specified, we should
// get a transform that does not give any mismatch. In other words, if the fixed
// landmarks are transformed by the transform computed by the
// LandmarkBasedTransformInitializer, they should coincide exactly with the moving
// landmarks. Note that we specified 4 landmarks, although three non-collinear
// landmarks is sufficient to guarantee a solution.
//
TransformInitializerType::PointsContainerConstIterator
fitr = fixedLandmarks.begin();
TransformInitializerType::PointsContainerConstIterator
mitr = movingLandmarks.begin();
typedef TransformInitializerType::OutputVectorType OutputVectorType;
OutputVectorType error;
OutputVectorType::RealValueType tolerance = 0.1;
bool failed = false;
while( mitr != movingLandmarks.end() )
{
std::cout << " Fixed Landmark: " << *fitr << " Moving landmark " << *mitr
<< " Transformed fixed Landmark : " <<
transform->TransformPoint( *fitr ) << std::endl;
error = *mitr - transform->TransformPoint( *fitr);
if( error.GetNorm() > tolerance )
{
failed = true;
}
++mitr;
++fitr;
}
if( failed )
{
// Hang heads in shame
std::cout << " Fixed landmarks transformed by the transform did not match closely "
<< " enough with the moving landmarks. The transform computed was: ";
transform->Print(std::cout);
std::cout << " [FAILED]" << std::endl;
return EXIT_FAILURE;
}
else
{
std::cout << " Landmark alignment using Rigid3D transform [PASSED]" << std::endl;
}
}
{
//Test landmark alignment using Rigid 2D transform in 2 dimensions
std::cout << "Testing Landmark alignment with Rigid2DTransform" << std::endl;
typedef unsigned char PixelType;
const unsigned int Dimension = 2;
typedef itk::Image< PixelType, Dimension > FixedImageType;
typedef itk::Image< PixelType, Dimension > MovingImageType;
FixedImageType::Pointer fixedImage = FixedImageType::New();
MovingImageType::Pointer movingImage = MovingImageType::New();
// Create fixed and moving images of size 30 x 30
//
FixedImageType::RegionType fRegion;
FixedImageType::SizeType fSize;
FixedImageType::IndexType fIndex;
fSize.Fill(30);
fIndex.Fill(0);
fRegion.SetSize( fSize );
fRegion.SetIndex( fIndex );
MovingImageType::RegionType mRegion;
MovingImageType::SizeType mSize;
MovingImageType::IndexType mIndex;
mSize.Fill(30);
mIndex.Fill(0);
mRegion.SetSize( mSize );
mRegion.SetIndex( mIndex );
fixedImage->SetLargestPossibleRegion( fRegion );
fixedImage->SetBufferedRegion( fRegion );
fixedImage->SetRequestedRegion( fRegion );
fixedImage->Allocate();
movingImage->SetLargestPossibleRegion( mRegion );
movingImage->SetBufferedRegion( mRegion );
movingImage->SetRequestedRegion( mRegion );
movingImage->Allocate();
// Set the transform type..
typedef itk::Rigid2DTransform< double > TransformType;
TransformType::Pointer transform = TransformType::New();
typedef itk::LandmarkBasedTransformInitializer< TransformType,
FixedImageType, MovingImageType > TransformInitializerType;
TransformInitializerType::Pointer initializer = TransformInitializerType::New();
initializer->DebugOn();
// Set fixed and moving landmarks
TransformInitializerType::LandmarkPointContainer fixedLandmarks;
TransformInitializerType::LandmarkPointContainer movingLandmarks;
TransformInitializerType::LandmarkPointType point;
TransformInitializerType::LandmarkPointType tmp;
// Moving Landmarks = Fixed Landmarks rotated by 'angle' degrees and then
// translated by the 'translation'. Offset can be used to move the fixed
// landmarks around.
double angle = 10 * nPI / 180.0;
TransformInitializerType::LandmarkPointType translation;
translation[0] = 6;
translation[1] = 10;
TransformInitializerType::LandmarkPointType offset;
offset[0] = 10;
offset[1] = 1;
point[0]=2 + offset[0];
point[1]=2 + offset[1];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
movingLandmarks.push_back(point);
point[0]=2 + offset[0];
point[1]=-2 + offset[1];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
movingLandmarks.push_back(point);
point[0]=-2 + offset[0];
point[1]=2 + offset[1];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
movingLandmarks.push_back(point);
point[0]=-2 + offset[0];
point[1]=-2 + offset[1];
fixedLandmarks.push_back(point);
tmp = point;
point[0] = cos(angle)*point[0] - sin(angle)*point[1] + translation[0];
point[1] = sin(angle)*tmp[0] + cos(angle)*point[1] + translation[1];
movingLandmarks.push_back(point);
initializer->SetFixedLandmarks(fixedLandmarks);
initializer->SetMovingLandmarks(movingLandmarks);
initializer->SetFixedImage( fixedImage );
initializer->SetMovingImage( movingImage );
initializer->SetTransform( transform );
initializer->InitializeTransform();
// Transform the landmarks now. For the given set of landmarks, since we computed the
// moving landmarks explicitly from the rotation and translation specified, we should
// get a transform that does not give any mismatch. In other words, if the fixed
// landmarks are transformed by the transform computed by the
// LandmarkBasedTransformInitializer, they should coincide exactly with the moving
// landmarks. Note that we specified 4 landmarks, although two
// landmarks is sufficient to guarantee a solution.
//
TransformInitializerType::PointsContainerConstIterator
fitr = fixedLandmarks.begin();
TransformInitializerType::PointsContainerConstIterator
mitr = movingLandmarks.begin();
typedef TransformInitializerType::OutputVectorType OutputVectorType;
OutputVectorType error;
OutputVectorType::RealValueType tolerance = 0.1;
bool failed = false;
while( mitr != movingLandmarks.end() )
{
std::cout << " Fixed Landmark: " << *fitr << " Moving landmark " << *mitr
<< " Transformed fixed Landmark : " <<
transform->TransformPoint( *fitr ) << std::endl;
error = *mitr - transform->TransformPoint( *fitr);
if( error.GetNorm() > tolerance )
{
failed = true;
}
++mitr;
++fitr;
}
if( failed )
{
// Hang heads in shame
std::cout << " Fixed landmarks transformed by the transform did not match closely "
<< " enough with the moving landmarks. The transform computed was: ";
transform->Print(std::cout);
std::cout << "[FAILED]" << std::endl;
return EXIT_FAILURE;
}
else
{
std::cout << " Landmark alignment using Rigid2D transform [PASSED]" << std::endl;
}
}
return EXIT_SUCCESS;
}
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