itkZeroCrossingImageFilter.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 __itkZeroCrossingImageFilter_h
#define __itkZeroCrossingImageFilter_h

#include "itkImageToImageFilter.h"
namespace itk
{
template< typename TInputImage, typename TOutputImage >
class ZeroCrossingImageFilter:
  public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
  typedef ZeroCrossingImageFilter                         Self;
  typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;

  typedef TInputImage  InputImageType;
  typedef TOutputImage OutputImageType;

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

  typedef typename TInputImage::PixelType  InputImagePixelType;
  typedef typename TOutputImage::PixelType OutputImagePixelType;

  itkNewMacro(Self);

  typedef typename TOutputImage::RegionType OutputImageRegionType;

  itkTypeMacro(ZeroCrossingImageFilter, ImageToImageFilter);

  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);
  itkStaticConstMacro(OutputImageDimension, unsigned int,
                      TOutputImage::ImageDimension);

  virtual void GenerateInputRequestedRegion();

  itkSetMacro(ForegroundValue, OutputImagePixelType);
  itkGetConstMacro(ForegroundValue, OutputImagePixelType);

  itkSetMacro(BackgroundValue, OutputImagePixelType);
  itkGetConstMacro(BackgroundValue, OutputImagePixelType);

#ifdef ITK_USE_CONCEPT_CHECKING
  // Begin concept checking
  itkConceptMacro( OutputEqualityComparableCheck,
                   ( Concept::EqualityComparable< OutputImagePixelType > ) );
  itkConceptMacro( SameDimensionCheck,
                   ( Concept::SameDimension< ImageDimension, OutputImageDimension > ) );
  itkConceptMacro( InputComparableCheck,
                   ( Concept::Comparable< InputImagePixelType > ) );
  itkConceptMacro( OutputOStreamWritableCheck,
                   ( Concept::OStreamWritable< OutputImagePixelType > ) );
  // End concept checking
#endif

protected:
  ZeroCrossingImageFilter()
  {
    m_ForegroundValue = NumericTraits< OutputImagePixelType >::One;
    m_BackgroundValue = NumericTraits< OutputImagePixelType >::Zero;
  }

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

  OutputImagePixelType m_BackgroundValue;
  OutputImagePixelType m_ForegroundValue;

  void ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
                            ThreadIdType threadId);

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

};
} //end of namespace itk

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

#endif