itkSumOfSquaresImageFunction.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
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef __itkSumOfSquaresImageFunction_h
#define __itkSumOfSquaresImageFunction_h

#include "itkImageFunction.h"
#include "itkNumericTraits.h"
#include "itkNeighborhood.h"

namespace itk
{
template< typename TInputImage, typename TCoordRep = float >
class SumOfSquaresImageFunction:
  public ImageFunction< TInputImage, typename NumericTraits< typename TInputImage::PixelType >::RealType,
                        TCoordRep >
{
public:

  typedef SumOfSquaresImageFunction Self;
  typedef ImageFunction< TInputImage, typename NumericTraits< typename TInputImage::PixelType >::RealType,
                         TCoordRep >                     Superclass;

  typedef SmartPointer< Self >       Pointer;
  typedef SmartPointer< const Self > ConstPointer;

  itkTypeMacro(SumOfSquaresImageFunction, ImageFunction);

  itkNewMacro(Self);

  typedef TInputImage InputImageType;

  typedef typename Superclass::OutputType OutputType;

  typedef typename Superclass::IndexType IndexType;

  typedef typename Superclass::ContinuousIndexType ContinuousIndexType;

  typedef typename Superclass::PointType PointType;

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

  typedef typename NumericTraits< typename InputImageType::PixelType >::RealType
  RealType;

  virtual RealType EvaluateAtIndex(const IndexType & index) const;

  virtual RealType Evaluate(const PointType & point) const
  {
    IndexType index;

    this->ConvertPointToNearestIndex(point, index);
    return this->EvaluateAtIndex(index);
  }

  virtual RealType EvaluateAtContinuousIndex(
    const ContinuousIndexType & cindex) const
  {
    IndexType index;

    this->ConvertContinuousIndexToNearestIndex(cindex, index);
    return this->EvaluateAtIndex(index);
  }

  itkGetConstReferenceMacro(NeighborhoodRadius, unsigned int);

  void SetNeighborhoodRadius(unsigned int radius)
  {
    m_NeighborhoodRadius = radius;

    m_NeighborhoodSize = 1;
    long twoRPlus1 = 2 * m_NeighborhoodRadius + 1;
    for ( unsigned int i = 0; i < ImageDimension; i++ )
      {
      m_NeighborhoodSize *= twoRPlus1;
      }
  }

  itkGetConstReferenceMacro(NeighborhoodSize, unsigned int);

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

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

  unsigned int m_NeighborhoodRadius;
  unsigned int m_NeighborhoodSize;
};
} // end namespace itk

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

#endif