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itkLandmarkBasedTransformInitializer.h
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itkLandmarkBasedTransformInitializer.h
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkLandmarkBasedTransformInitializer.h
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkLandmarkBasedTransformInitializer_h
#define __itkLandmarkBasedTransformInitializer_h
#include "itkObject.h"
#include "itkObjectFactory.h"
#include "itkVersorRigid3DTransform.h"
#include "itkRigid2DTransform.h"
#include <vector>
#include <iostream>
namespace itk
{
/** \class LandmarkBasedTransformInitializer
* \brief LandmarkBasedTransformInitializer is a helper class intended to
* The class computes the transform that aligns the fixed and moving images
* given a set of landmarks. The class is templated over the Transform type.
* The transform computed gives the best fit transform that maps the fixed
* and moving images in a least squares sense. The indices are taken to
* correspond, so point 1 in the first set will get mapped close to point
* 1 in the second set, etc. An equal number of fixed and moving landmarks
* need to be specified using SetFixedLandmarks() SetMovingLandmarks().
* Any number of landmarks may be specified.
* Call InitializeTransform() to initialize the transform.
*
* Currently, the following transforms are supported by the class:
* VersorRigid3DTransform
* Rigid2DTansform
*
* The class is based in part on Hybrid/vtkLandmarkTransform originally
* implemented in python by David G. Gobbi.
*
* The solution is based on
* Berthold K. P. Horn (1987), "Closed-form solution of absolute orientation
* using unit quaternions,"
* http://people.csail.mit.edu/bkph/papers/Absolute_Orientation.pdf
*
*
* \ingroup Transforms
*/
template < class TTransform,
class TFixedImage,
class TMovingImage >
class ITK_EXPORT LandmarkBasedTransformInitializer :
public Object
{
public:
/** Standard class typedefs. */
typedef LandmarkBasedTransformInitializer Self;
typedef Object Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** New macro for creation of through a Smart Pointer. */
itkNewMacro( Self );
/** Run-time type information (and related methods). */
itkTypeMacro( LandmarkBasedTransformInitializer, Object );
/** Type of the transform to initialize */
typedef TTransform TransformType;
typedef typename TransformType::Pointer TransformPointer;
/** Dimension of parameters. */
itkStaticConstMacro(InputSpaceDimension, unsigned int, TransformType::InputSpaceDimension);
itkStaticConstMacro(OutputSpaceDimension, unsigned int, TransformType::OutputSpaceDimension);
/** Set the transform to be initialized */
itkSetObjectMacro( Transform, TransformType );
/** Image Types to use in the initialization of the transform */
typedef TFixedImage FixedImageType;
typedef TMovingImage MovingImageType;
typedef typename FixedImageType::ConstPointer FixedImagePointer;
typedef typename MovingImageType::ConstPointer MovingImagePointer;
/** Determine the image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int, FixedImageType::ImageDimension );
/** Convenience typedefs */
typedef typename TransformType::InputPointType InputPointType;
typedef typename TransformType::OutputVectorType OutputVectorType;
typedef Point< double, itkGetStaticConstMacro(ImageDimension) > LandmarkPointType;
typedef std::vector< LandmarkPointType > LandmarkPointContainer;
typedef typename
LandmarkPointContainer::const_iterator PointsContainerConstIterator;
typedef typename TransformType::ParametersType ParametersType;
typedef typename ParametersType::ValueType ParameterValueType;
/** Set the Fixed landmark point containers */
void SetFixedLandmarks(const LandmarkPointContainer & fixedLandmarks)
{
this->m_FixedLandmarks = fixedLandmarks;
}
/** Set the Moving landmark point containers */
void SetMovingLandmarks(const LandmarkPointContainer & movingLandmarks)
{
this->m_MovingLandmarks = movingLandmarks;
}
/** Supported Transform typedefs */
typedef VersorRigid3DTransform< ParameterValueType >
VersorRigid3DTransformType;
typedef Rigid2DTransform< ParameterValueType > Rigid2DTransformType;
/** Initialize the transform from the landmarks */
virtual void InitializeTransform();
protected:
LandmarkBasedTransformInitializer();
~LandmarkBasedTransformInitializer(){};
void PrintSelf(std::ostream &os, Indent indent) const;
// Supported Transform types
typedef enum{
VersorRigid3Dtransform=1,
Rigid2Dtransfrom,
Else
}InputTransformType;
private:
LandmarkBasedTransformInitializer(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
FixedImagePointer m_FixedImage;
MovingImagePointer m_MovingImage;
LandmarkPointContainer m_FixedLandmarks;
LandmarkPointContainer m_MovingLandmarks;
TransformPointer m_Transform;
}; //class LandmarkBasedTransformInitializer
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLandmarkBasedTransformInitializer.txx"
#endif
#endif /* __itkLandmarkBasedTransformInitializer_h */