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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkCenteredTransformInitializer.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:33 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkCenteredTransformInitializer_h |
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#define __itkCenteredTransformInitializer_h |
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#include "itkObject.h" |
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#include "itkObjectFactory.h" |
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#include "itkImageMomentsCalculator.h" |
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#include <iostream> |
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namespace itk |
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{ |
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/** \brief CenteredTransformInitializer is a helper class intended to |
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* initialize the center of rotation and the translation of Transforms having |
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* the center of rotation among their parameters. |
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* |
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* This class is connected to the fixed image, moving image and transform |
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* involved in the registration. Two modes of operation are possible: |
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* |
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* - Geometrical, |
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* - Center of mass |
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* |
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* In the first mode, the geometrical center of the moving image is passed as |
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* initial center of rotation to the transform and the vector from the center |
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* of the fixed image to the center of the moving image is passed as the |
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* initial translation. This mode basically assumes that the anatomical objects |
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* to be registered are centered in their respective images. Hence the best |
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* initial guess for the registration is the one that superimposes those two |
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* centers. |
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* |
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* In the second mode, the moments of gray level values are computed |
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* for both images. The center of mass of the moving image is then |
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* used as center of rotation. The vector between the two centers of |
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* mass is passes as the initial translation to the transform. This |
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* second approach assumes that the moments of the anatomical objects |
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* are similar for both images and hence the best initial guess for |
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* registration is to superimpose both mass centers. Note that this |
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* assumption will probably not hold in multi-modality registration. |
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* |
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* \ingroup Transforms |
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*/ |
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template < class TTransform, |
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class TFixedImage, |
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class TMovingImage > |
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MCM |
class ITK_EXPORT CenteredTransformInitializer : |
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************public Object |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef CenteredTransformInitializer Self; |
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typedef Object Superclass; |
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typedef SmartPointer<Self> Pointer; |
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typedef SmartPointer<const Self> ConstPointer; |
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/** New macro for creation of through a Smart Pointer. */ |
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itkNewMacro( Self ); |
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/** Run-time type information (and related methods). */ |
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itkTypeMacro( CenteredTransformInitializer, Object ); |
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/** Type of the transform to initialize */ |
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typedef TTransform TransformType; |
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typedef typename TransformType::Pointer TransformPointer; |
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/** Dimension of parameters. */ |
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itkStaticConstMacro(SpaceDimension, unsigned int, TransformType::SpaceDimension); |
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itkStaticConstMacro(InputSpaceDimension, unsigned int, TransformType::InputSpaceDimension); |
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itkStaticConstMacro(OutputSpaceDimension, unsigned int, TransformType::OutputSpaceDimension); |
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/** Image Types to use in the initialization of the transform */ |
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typedef TFixedImage FixedImageType; |
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typedef TMovingImage MovingImageType; |
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typedef typename FixedImageType::ConstPointer FixedImagePointer; |
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typedef typename MovingImageType::ConstPointer MovingImagePointer; |
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/** Moment calculators */ |
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typedef ImageMomentsCalculator< FixedImageType > FixedImageCalculatorType; |
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typedef ImageMomentsCalculator< MovingImageType > MovingImageCalculatorType; |
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typedef typename FixedImageCalculatorType::Pointer FixedImageCalculatorPointer; |
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typedef typename MovingImageCalculatorType::Pointer MovingImageCalculatorPointer; |
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/** Offset type. */ |
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typedef typename TransformType::OffsetType OffsetType; |
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/** Point type. */ |
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typedef typename TransformType::InputPointType InputPointType; |
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/** Vector type. */ |
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typedef typename TransformType::OutputVectorType OutputVectorType; |
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/** Set the transform to be initialized */ |
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itkSetObjectMacro( Transform, TransformType ); |
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/** Set the fixed image used in the registration process */ |
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itkSetConstObjectMacro( FixedImage, FixedImageType ); |
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/** Set the moving image used in the registration process */ |
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itkSetConstObjectMacro( MovingImage, MovingImageType ); |
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/** Initialize the transform using data from the images */ |
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virtual void InitializeTransform() const; |
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/** Select between using the geometrical center of the images or |
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******using the center of mass given by the image intensities. */ |
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void GeometryOn() { m_UseMoments = false; } |
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void MomentsOn() { m_UseMoments = true; } |
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/** Get() access to the moments calculators */ |
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itkGetConstObjectMacro( FixedCalculator, FixedImageCalculatorType ); |
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itkGetConstObjectMacro( MovingCalculator, MovingImageCalculatorType ); |
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protected: |
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CenteredTransformInitializer(); |
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~CenteredTransformInitializer(){}; |
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void PrintSelf(std::ostream &os, Indent indent) const; |
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private: |
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CenteredTransformInitializer(const Self&); //purposely not implemented |
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void operator=(const Self&); //purposely not implemented |
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TransformPointer m_Transform; |
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FixedImagePointer m_FixedImage; |
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MovingImagePointer m_MovingImage; |
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bool m_UseMoments; |
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FixedImageCalculatorPointer m_FixedCalculator; |
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MovingImageCalculatorPointer m_MovingCalculator; |
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}; //class CenteredTransformInitializer |
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} // namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkCenteredTransformInitializer.txx" |
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#endif |
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#endif /* __itkCenteredTransformInitializer_h */ |
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