itkNearestNeighborInterpolateImageFunction.h

Go to the documentation of this file.

/*=========================================================================
 *
 *  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 itkNearestNeighborInterpolateImageFunction_h
#define itkNearestNeighborInterpolateImageFunction_h

#include "itkInterpolateImageFunction.h"

namespace itk
{
template< typename TInputImage, typename TCoordRep = double >
class ITK_TEMPLATE_EXPORT NearestNeighborInterpolateImageFunction:
  public InterpolateImageFunction< TInputImage, TCoordRep >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(NearestNeighborInterpolateImageFunction);

  using Self = NearestNeighborInterpolateImageFunction;
  using Superclass = InterpolateImageFunction< TInputImage, TCoordRep >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(NearestNeighborInterpolateImageFunction,
               InterpolateImageFunction);

  itkNewMacro(Self);

  using OutputType = typename Superclass::OutputType;

  using InputImageType = typename Superclass::InputImageType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  using IndexType = typename Superclass::IndexType;

  using ContinuousIndexType = typename Superclass::ContinuousIndexType;

  OutputType EvaluateAtContinuousIndex(
    const ContinuousIndexType & index) const override
  {
    IndexType nindex;

    this->ConvertContinuousIndexToNearestIndex(index, nindex);
    return static_cast< OutputType >( this->GetInputImage()->GetPixel(nindex) );
  }

protected:
  NearestNeighborInterpolateImageFunction()= default;
  ~NearestNeighborInterpolateImageFunction() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override
  { Superclass::PrintSelf(os, indent); }
};
} // end namespace itk

#endif