ITK/Examples/Developer/ImageFilter: Difference between revisions

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This example demonstrates the creation of a filter which produces the output image which is equal to the input image except its pixel on the main diagonal are turned to white.
{{warning|1=The media wiki content on this page is no longer maintained.  The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releasesIn many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}}
 
==ImageFilterExample.cxx==
<source lang="cpp">
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
 
#include "ImageFilter.h"
 
template <typename TImage>
static void CreateImage(TImage* const image);
 
int main(int, char*[])
{
  // Setup types
  typedef itk::Image<int, 2>  ImageType;
  typedef itk::ImageFilter<ImageType> FilterType;
 
  ImageType::Pointer image = ImageType::New();
  CreateImage(image.GetPointer());
 
  // Create and the filter
  FilterType::Pointer filter = FilterType::New();
  filter->SetInput(image);
  filter->Update();
 
  itk::Index<2> cornerPixel = image->GetLargestPossibleRegion().GetIndex();
 
  // The output here is:
  // 0
  // 3
  // That is, the filter changed the pixel, but the input remained unchagned.
  std::cout << image->GetPixel(cornerPixel) << std::endl;
  std::cout << filter->GetOutput()->GetPixel(cornerPixel) << std::endl;
 
  return EXIT_SUCCESS;
}
 
 
template <typename TImage>
void CreateImage(TImage* const image)
{
  // Create an image with 2 connected components
  typename TImage::IndexType corner = {{0,0}};
 
  unsigned int NumRows = 200;
  unsigned int NumCols = 300;
  typename TImage::SizeType size = {{NumRows, NumCols}};
 
  typename TImage::RegionType region(corner, size);
 
  image->SetRegions(region);
  image->Allocate();
 
  image->FillBuffer(0);
}
 
</source>
 
==ImageFilter.h==
<source lang="cpp">
#ifndef __itkImageFilter_h
#define __itkImageFilter_h
 
#include "itkImageToImageFilter.h"
 
namespace itk
{
template< class TImage>
class ImageFilter:public ImageToImageFilter< TImage, TImage >
{
public:
  /** Standard class typedefs. */
  typedef ImageFilter            Self;
  typedef ImageToImageFilter< TImage, TImage > Superclass;
  typedef SmartPointer< Self >        Pointer;
 
  /** Method for creation through the object factory. */
  itkNewMacro(Self);
 
  /** Run-time type information (and related methods). */
   itkTypeMacro(ImageFilter, ImageToImageFilter);
 
protected:
  ImageFilter(){}
  ~ImageFilter(){}
 
  /** Does the real work. */
  virtual void GenerateData();
 
private:
  ImageFilter(const Self &); //purposely not implemented
  void operator=(const Self &);  //purposely not implemented
 
};
} //namespace ITK
 
 
#ifndef ITK_MANUAL_INSTANTIATION
#include "ImageFilter.hxx"
#endif
 
 
#endif // __itkImageFilter_h
 
</source>
 
==ImageFilter.txx==
<source lang="cpp">
#ifndef __itkImageFilter_hxx
#define __itkImageFilter_hxx
 
#include "ImageFilter.h"
#include "itkObjectFactory.h"
#include "itkImageRegionIterator.h"
#include "itkImageRegionConstIterator.h"
 
namespace itk
{
 
template< class TImage>
void ImageFilter< TImage>
::GenerateData()
{
  typename TImage::ConstPointer input = this->GetInput();
 
  itk::Index<2> cornerPixel = this->GetInput()->GetLargestPossibleRegion().GetIndex();
  typename TImage::PixelType newValue = 3;
 
  this->AllocateOutputs();
 
  ImageAlgorithm::Copy(this->GetInput(), this->GetOutput(), this->GetOutput()->GetRequestedRegion(),
                      this->GetOutput()->GetRequestedRegion() );
 
  this->GetOutput()->SetPixel( cornerPixel, newValue );
}
 
}// end namespace
 
 
#endif
</source>
 
{{ITKCMakeLists|ImageFilter}}

Latest revision as of 17:54, 7 June 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.