itkGaussianInterpolateImageFunction.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGaussianInterpolateImageFunction.h,v $
  Language:  C++
  Date:      $Date: $
  Version:   $Revision: $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or https://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 itkGaussianInterpolateImageFunction_h
#define itkGaussianInterpolateImageFunction_h

#include "itkInterpolateImageFunction.h"

#include "itkConceptChecking.h"
#include "itkFixedArray.h"
#include "vnl/vnl_erf.h"

namespace itk
{

template <typename TInputImage, typename TCoordRep = double>
class ITK_TEMPLATE_EXPORT GaussianInterpolateImageFunction :
  public InterpolateImageFunction<TInputImage, TCoordRep>
{
public:
  typedef GaussianInterpolateImageFunction                 Self;
  typedef InterpolateImageFunction<TInputImage, TCoordRep> Superclass;
  typedef SmartPointer<Self>                               Pointer;
  typedef SmartPointer<const Self>                         ConstPointer;

  itkTypeMacro( GaussianInterpolateImageFunction, InterpolateImageFunction );

  itkNewMacro( Self );

  itkStaticConstMacro( ImageDimension, unsigned int,
    TInputImage::ImageDimension );


  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::InputImageType InputImageType;

  typedef typename Superclass::RealType RealType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef FixedArray<RealType, ImageDimension> ArrayType;

  virtual void SetInputImage( const TInputImage *image ) ITK_OVERRIDE
    {
    Superclass::SetInputImage( image );
    this->ComputeBoundingBox();
    }

  virtual void SetSigma( const ArrayType s )
    {
    if( this->m_Sigma != s )
      {
      this->m_Sigma = s;
      this->ComputeBoundingBox();
      this->Modified();
      }
    }
  virtual void SetSigma( RealType *s )
    {
    ArrayType sigma;
    for( unsigned int d = 0; d < ImageDimension; d++ )
      {
      sigma[d] = s[d];
      }
    this->SetSigma( sigma );
    }
  itkGetConstMacro( Sigma, ArrayType );

  virtual void SetAlpha( const RealType a )
    {
    if( Math::NotExactlyEquals(this->m_Alpha, a) )
      {
      this->m_Alpha = a;
      this->ComputeBoundingBox();
      this->Modified();
      }
    }
  itkGetConstMacro( Alpha, RealType );

  virtual void SetParameters( RealType *sigma, RealType alpha )
    {
    this->SetSigma( sigma );
    this->SetAlpha( alpha );
    }

  virtual OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType & cindex ) const ITK_OVERRIDE
    {
    return this->EvaluateAtContinuousIndex( cindex, ITK_NULLPTR );
    }

protected:
  GaussianInterpolateImageFunction();
  ~GaussianInterpolateImageFunction(){};
  void PrintSelf( std::ostream& os, Indent indent ) const ITK_OVERRIDE;

  virtual void ComputeBoundingBox();

  virtual void ComputeErrorFunctionArray( unsigned int dimension, RealType cindex,
    vnl_vector<RealType> &erfArray, vnl_vector<RealType> &gerfArray,
    bool evaluateGradient = false ) const;

  itkSetMacro( BoundingBoxStart, ArrayType );
  itkGetConstMacro( BoundingBoxStart, ArrayType );

  itkSetMacro( BoundingBoxEnd, ArrayType );
  itkGetConstMacro( BoundingBoxEnd, ArrayType );

  itkSetMacro( CutOffDistance, ArrayType );
  itkGetConstMacro( CutOffDistance, ArrayType );


private:
  ITK_DISALLOW_COPY_AND_ASSIGN(GaussianInterpolateImageFunction);

  virtual OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType &, OutputType * ) const;

  ArrayType                                 m_Sigma;
  RealType                                  m_Alpha;

  ArrayType                                 m_BoundingBoxStart;
  ArrayType                                 m_BoundingBoxEnd;
  ArrayType                                 m_ScalingFactor;
  ArrayType                                 m_CutOffDistance;


};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGaussianInterpolateImageFunction.hxx"
#include "itkMath.h"
#endif

#endif