itkGaussianExponentialDiffeomorphicTransform.h

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 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
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 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  See the License for the specific language governing permissions and
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#ifndef __itkGaussianExponentialDiffeomorphicTransform_h
#define __itkGaussianExponentialDiffeomorphicTransform_h

#include "itkConstantVelocityFieldTransform.h"

#include "itkGaussianOperator.h"
#include "itkVectorNeighborhoodOperatorImageFilter.h"

namespace itk
{

template
  <class TScalar, unsigned int NDimensions>
class GaussianExponentialDiffeomorphicTransform :
  public ConstantVelocityFieldTransform<TScalar, NDimensions>
{
public:
  typedef GaussianExponentialDiffeomorphicTransform                 Self;
  typedef ConstantVelocityFieldTransform<TScalar, NDimensions>      Superclass;
  typedef SmartPointer<Self>                                        Pointer;
  typedef SmartPointer<const Self>                                  ConstPointer;

  itkTypeMacro( GaussianExponentialDiffeomorphicTransform, ConstantVelocityFieldTransform );

  itkNewMacro( Self );

  itkStaticConstMacro( ConstantVelocityFieldDimension, unsigned int, NDimensions );

  itkStaticConstMacro( Dimension, unsigned int, NDimensions );

  typedef typename Superclass::ScalarType               ScalarType;
  typedef typename Superclass::DerivativeType           DerivativeType;
  typedef typename DerivativeType::ValueType            DerivativeValueType;

  typedef typename Superclass::DisplacementFieldType        DisplacementFieldType;
  typedef typename Superclass::DisplacementFieldPointer     DisplacementFieldPointer;
  typedef typename Superclass::ConstantVelocityFieldType    ConstantVelocityFieldType;
  typedef typename Superclass::ConstantVelocityFieldPointer ConstantVelocityFieldPointer;

  typedef typename DisplacementFieldType::PixelType     DisplacementVectorType;

  virtual void UpdateTransformParameters( const DerivativeType & update, ScalarType factor = 1.0 );

  virtual ConstantVelocityFieldPointer GaussianSmoothConstantVelocityField( ConstantVelocityFieldType *, ScalarType );

  itkSetMacro( GaussianSmoothingVarianceForTheConstantVelocityField, ScalarType );
  itkGetConstMacro( GaussianSmoothingVarianceForTheConstantVelocityField, ScalarType );

  itkSetMacro( GaussianSmoothingVarianceForTheUpdateField, ScalarType );
  itkGetConstMacro( GaussianSmoothingVarianceForTheUpdateField, ScalarType );

protected:
  GaussianExponentialDiffeomorphicTransform();
  virtual ~GaussianExponentialDiffeomorphicTransform();

  typedef GaussianOperator<ScalarType, NDimensions> GaussianSmoothingOperatorType;

  typedef VectorNeighborhoodOperatorImageFilter
    <ConstantVelocityFieldType, ConstantVelocityFieldType>
                                                  GaussianSmoothingSmootherType;

  GaussianSmoothingOperatorType                   m_GaussianSmoothingOperator;

  void PrintSelf( std::ostream &, Indent ) const;

private:
  GaussianExponentialDiffeomorphicTransform( const Self& ); //purposely not implemented
  void operator=( const Self& ); //purposely not implemented

  ScalarType                              m_GaussianSmoothingVarianceForTheUpdateField;
  ScalarType                              m_GaussianSmoothingVarianceForTheConstantVelocityField;
};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
# include "itkGaussianExponentialDiffeomorphicTransform.hxx"
#endif

#endif // __itkGaussianExponentialDiffeomorphicTransform_h