ITK/Examples/ImageProcessing/ConvolutionImageFilter

ConvolutionImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkConvolutionImageFilter.h"
4. include "itkImageRegionIterator.h"

1. include "QuickView.h"

typedef itk::Image<float, 2> ImageType;

void CreateKernel(ImageType::Pointer kernel, unsigned int width);

int main(int argc, char * argv[]) {

 // Verify command line arguments
 if( argc < 2 )
   {
   std::cerr << "Usage: ";
   std::cerr << argv[0] << "inputImageFile [width]" << std::endl;
   return EXIT_FAILURE;
   }

 // Parse command line arguments
 unsigned int width = 3;
 if (argc > 2)
   {
   width = atoi(argv[2]);
   }

 ImageType::Pointer kernel = ImageType::New();
 CreateKernel(kernel, width);
 
 typedef itk::ImageFileReader<ImageType>        ReaderType;
 typedef itk::ConvolutionImageFilter<ImageType> FilterType;

 // Create and setup a reader
 ReaderType::Pointer reader = ReaderType::New();
 reader->SetFileName( argv[1] );

 // Convolve image with kernel.
 FilterType::Pointer convolutionFilter = FilterType::New();
 convolutionFilter->SetInput(reader->GetOutput());
 convolutionFilter->SetImageKernelInput(kernel);

 QuickView viewer;
 viewer.AddImage<ImageType>(
   reader->GetOutput(),true,
   itksys::SystemTools::GetFilenameName(argv[1]));  

 std::stringstream desc;
 desc << "ConvolutionFilter\n"
      << "Kernel Witdh = " << width;
 viewer.AddImage<ImageType>(
   convolutionFilter->GetOutput(),
   true,
   desc.str());
 viewer.Visualize();

 return EXIT_SUCCESS;

}

void CreateKernel(ImageType::Pointer kernel, unsigned int width) {

 ImageType::IndexType start;
 start.Fill(0);

 ImageType::SizeType size;
 size.Fill(width);

 ImageType::RegionType region;
 region.SetSize(size);
 region.SetIndex(start);

 kernel->SetRegions(region);
 kernel->Allocate();
 
 itk::ImageRegionIterator<ImageType> imageIterator(kernel, region);

 while(!imageIterator.IsAtEnd())
   {
   //imageIterator.Set(255);
   imageIterator.Set(1);

   ++imageIterator;
   }

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(ConvolutionImageFilter)

include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)

FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(ConvolutionImageFilter ConvolutionImageFilter.cxx) TARGET_LINK_LIBRARIES(ConvolutionImageFilter vtkHybrid ITKBasicFilters ITKIO ITKCommon)

</source>