itkBinaryThresholdImageFunction.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 itkBinaryThresholdImageFunction_h
#define itkBinaryThresholdImageFunction_h

#include "itkImageFunction.h"

namespace itk
{
template< typename TInputImage, typename TCoordRep = float >
class ITK_TEMPLATE_EXPORT BinaryThresholdImageFunction:
  public ImageFunction< TInputImage, bool, TCoordRep >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(BinaryThresholdImageFunction);

  using Self = BinaryThresholdImageFunction;
  using Superclass = ImageFunction< TInputImage, bool, TCoordRep >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkTypeMacro(BinaryThresholdImageFunction, ImageFunction);

  itkNewMacro(Self);

  using InputImageType = typename Superclass::InputImageType;

  using PixelType = typename TInputImage::PixelType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  using PointType = typename Superclass::PointType;

  using IndexType = typename Superclass::IndexType;

  using ContinuousIndexType = typename Superclass::ContinuousIndexType;

  bool Evaluate(const PointType & point) const override
  {
    IndexType index;

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

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

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

  bool EvaluateAtIndex(const IndexType & index) const override
  {
    PixelType value = this->GetInputImage()->GetPixel(index);

    return ( m_Lower <= value && value <= m_Upper );
  }

  itkGetConstReferenceMacro(Lower, PixelType);

  itkGetConstReferenceMacro(Upper, PixelType);

  void ThresholdAbove(PixelType thresh);

  void ThresholdBelow(PixelType thresh);

  void ThresholdBetween(PixelType lower, PixelType upper);

protected:
  BinaryThresholdImageFunction();
  ~BinaryThresholdImageFunction() override = default;
  void PrintSelf(std::ostream & os, Indent indent) const override;

private:
  PixelType m_Lower;
  PixelType m_Upper;
};
} // end namespace itk

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

#endif