text: /*=========================================================================
   *
   *  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 itkVectorMeanImageFunction_h
  #define itkVectorMeanImageFunction_h
  
  #include "itkImageFunction.h"
  #include "itkNumericTraits.h"
  
  namespace itk
  {
  /**
   * \class VectorMeanImageFunction
   * \brief Calculate the mean value in the neighborhood of a pixel in a Vector image.
   *
   * Calculate the mean pixel value over the standard 8, 26, etc. connected
   * neighborhood.  This calculation uses a ZeroFluxNeumannBoundaryCondition.
   *
   * If called with a ContinuousIndex or Point, the calculation is performed
   * at the nearest neighbor.
   *
   * This class is templated over the input image type and the
   * coordinate representation type (e.g. float or double).
   *
   * \sa MeanImageFunction
   *
   * \ingroup ImageFunctions
   * \ingroup ITKImageFunction
   */
  template< typename TInputImage, typename TCoordRep = float >
  class ITK_TEMPLATE_EXPORT VectorMeanImageFunction:
    public ImageFunction< TInputImage,
                          typename NumericTraits< typename TInputImage::PixelType >::RealType,
                          TCoordRep >
  {
  public:
    /** Standard class typedefs. */
    typedef VectorMeanImageFunction Self;
    typedef ImageFunction< TInputImage,
                           typename NumericTraits< typename TInputImage::PixelType >::RealType,
                           TCoordRep >                     Superclass;
  
    typedef SmartPointer< Self >       Pointer;
    typedef SmartPointer< const Self > ConstPointer;
  
    /** Run-time type information (and related methods). */
    itkTypeMacro(VectorMeanImageFunction, ImageFunction);
  
    /** Method for creation through the object factory. */
    itkNewMacro(Self);
  
    /** InputImageType typedef support. */
    typedef TInputImage InputImageType;
  
    /** OutputType typdef support. */
    typedef typename Superclass::OutputType OutputType;
  
    /** Index typedef support. */
    typedef typename Superclass::IndexType IndexType;
  
    /** ContinuousIndex typedef support. */
    typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
  
    /** Point typedef support. */
    typedef typename Superclass::PointType PointType;
  
    /** Dimension of the underlying image. */
    itkStaticConstMacro(ImageDimension, unsigned int,
                        InputImageType::ImageDimension);
  
    /** Datatype used for the mean */
    typedef typename NumericTraits< typename TInputImage::PixelType >::RealType RealType;
  
    /** Evalulate the function at specified index */
    virtual RealType EvaluateAtIndex(const IndexType & index) const ITK_OVERRIDE;
  
    /** Evaluate the function at non-integer positions */
    virtual RealType Evaluate(const PointType & point) const ITK_OVERRIDE
    {
      IndexType index;
  
      this->ConvertPointToNearestIndex(point, index);
      return this->EvaluateAtIndex(index);
    }
  
    virtual RealType EvaluateAtContinuousIndex(
      const ContinuousIndexType & cindex) const ITK_OVERRIDE
    {
      IndexType index;
  
      this->ConvertContinuousIndexToNearestIndex(cindex, index);
      return this->EvaluateAtIndex(index);
    }
  
    /** Get/Set the radius of the neighborhood over which the
        statistics are evaluated */
    itkSetMacro(NeighborhoodRadius, unsigned int);
    itkGetConstReferenceMacro(NeighborhoodRadius, unsigned int);
  
  protected:
    VectorMeanImageFunction();
    ~VectorMeanImageFunction(){}
    void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
  
  private:
    ITK_DISALLOW_COPY_AND_ASSIGN(VectorMeanImageFunction);
  
    unsigned int m_NeighborhoodRadius;
  };
  } // end namespace itk
  
  #ifndef ITK_MANUAL_INSTANTIATION
  #include "itkVectorMeanImageFunction.hxx"
  #endif
  
  #endif
  