itkBinaryThresholdProjectionImageFilter.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 __itkBinaryThresholdProjectionImageFilter_h
#define __itkBinaryThresholdProjectionImageFilter_h

#include "itkProjectionImageFilter.h"
#include "itkConceptChecking.h"

namespace itk
{
namespace Function
{
template< class TInputPixel, class TOutputPixel >
class BinaryThresholdAccumulator
{
public:
  BinaryThresholdAccumulator(SizeValueType) {}
  ~BinaryThresholdAccumulator(){}

  inline void Initialize()
  {
    m_IsForeground = false;
  }

  inline void operator()(const TInputPixel & input)
  {
    if ( input >= m_ThresholdValue )
      {
      m_IsForeground = true;
      }
  }

  inline TOutputPixel GetValue()
  {
    if ( m_IsForeground )
      {
      return m_ForegroundValue;
      }
    else
      {
      return m_BackgroundValue;
      }
  }

  bool m_IsForeground;

  TInputPixel  m_ThresholdValue;
  TOutputPixel m_ForegroundValue;
  TOutputPixel m_BackgroundValue;
};
} // end namespace Function

template< class TInputImage, class TOutputImage >
class ITK_EXPORT BinaryThresholdProjectionImageFilter:
  public ProjectionImageFilter< TInputImage, TOutputImage,
                                Function::BinaryThresholdAccumulator<
                                  typename TInputImage::PixelType,
                                  typename TOutputImage::PixelType > >
{
public:
  typedef BinaryThresholdProjectionImageFilter Self;
  typedef ProjectionImageFilter< TInputImage, TOutputImage,
                                 Function::BinaryThresholdAccumulator<
                                   typename TInputImage::PixelType,
                                   typename TOutputImage::PixelType > > Superclass;

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

  itkTypeMacro(BinaryThresholdProjectionImageFilter, ProjectionImageFilter);

  itkNewMacro(Self);

  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;

  typedef typename InputImageType::PixelType  InputPixelType;
  typedef typename OutputImageType::PixelType OutputPixelType;

  typedef typename Superclass::AccumulatorType AccumulatorType;

  itkSetMacro(ForegroundValue, OutputPixelType);
  itkGetConstMacro(ForegroundValue, OutputPixelType);

  itkSetMacro(BackgroundValue, OutputPixelType);
  itkGetConstMacro(BackgroundValue, OutputPixelType);

  itkSetMacro(ThresholdValue, InputPixelType);
  itkGetConstMacro(ThresholdValue, InputPixelType);

#ifdef ITK_USE_CONCEPT_CHECKING

  itkConceptMacro( InputPixelTypeGreaterThanComparable,
                   ( Concept::GreaterThanComparable< InputPixelType > ) );
  itkConceptMacro( InputHasNumericTraitsCheck,
                   ( Concept::HasNumericTraits< InputPixelType > ) );

#endif

protected:
  BinaryThresholdProjectionImageFilter()
  {
    m_ForegroundValue = NumericTraits< OutputPixelType >::max();
    m_BackgroundValue = NumericTraits< OutputPixelType >::NonpositiveMin();
    m_ThresholdValue = NumericTraits< InputPixelType >::Zero;
  }

  virtual ~BinaryThresholdProjectionImageFilter() {}

  void PrintSelf(std::ostream & os, Indent indent) const
  {
    Superclass::PrintSelf(os, indent);

    typedef typename NumericTraits< InputPixelType >::PrintType
    InputPixelPrintType;

    os << indent << "ForegroundValue: "
       << static_cast< InputPixelPrintType >( m_ForegroundValue )
       << std::endl;

    typedef typename NumericTraits< OutputPixelType >::PrintType
    OutputPixelPrintType;

    os << indent << "BackgroundValue: "
       << static_cast< OutputPixelPrintType >( m_BackgroundValue )
       << std::endl;

    os << indent << "ThresholdValue: "
       << static_cast< InputPixelPrintType >( m_ThresholdValue )
       << std::endl;
  }

  virtual AccumulatorType NewAccumulator(SizeValueType size) const
  {
    AccumulatorType accumulator(size);

    accumulator.m_ForegroundValue = m_ForegroundValue;
    accumulator.m_BackgroundValue = m_BackgroundValue;
    accumulator.m_ThresholdValue = m_ThresholdValue;
    return accumulator;
  }

  OutputPixelType m_ForegroundValue;

  OutputPixelType m_BackgroundValue;

  InputPixelType m_ThresholdValue;

private:
  //purposely not implemented
  BinaryThresholdProjectionImageFilter(const Self &);
  void operator=(const Self &);
};  // end BinaryThresholdProjectionImageFilter
} //end namespace itk

#endif