ITK/Examples/EdgesAndGradients/GradientMagnitudeRecursiveGaussianImageFilter: Difference between revisions

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#include "itkImageFileReader.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkGradientMagnitudeRecursiveGaussianImageFilter.h"
#include "itkGradientMagnitudeRecursiveGaussianImageFilter.h"


#include <itkImageToVTKImageFilter.h>
#include "QuickView.h"
 
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"


int main(int argc, char * argv[])
int main(int argc, char * argv[])
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     {
     {
     std::cerr << "Usage: " << std::endl;
     std::cerr << "Usage: " << std::endl;
     std::cerr << argv[0] << "inputImageFile" << std::endl;
     std::cerr << argv[0] << " inputImageFile" << std::endl;
     return EXIT_FAILURE;
     return EXIT_FAILURE;
     }
     }
Line 32: Line 24:


   // Setup types
   // Setup types
   typedef itk::Image< float,  2 >   FloatImageType;
   typedef itk::Image< float,  2 >       FloatImageType;
   typedef itk::Image< unsigned char, 2 >   UnsignedCharImageType;
   typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;


   typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
   typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
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   filterType::Pointer gradientFilter = filterType::New();
   filterType::Pointer gradientFilter = filterType::New();
   gradientFilter->SetInput( reader->GetOutput() );
   gradientFilter->SetInput( reader->GetOutput() );
  gradientFilter->Update();
  // To write the gradient image file, we must rescale the gradient values
  // to a reasonable range
  typedef itk::RescaleIntensityImageFilter<
  FloatImageType, UnsignedCharImageType > rescaleFilterType;
  rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
  rescaler->SetOutputMinimum(0);
  rescaler->SetOutputMaximum(255);
  rescaler->SetInput( gradientFilter->GetOutput() );
  rescaler->Update();
  typedef itk::ImageToVTKImageFilter<UnsignedCharImageType> ConnectorType;
  ConnectorType::Pointer originalConnector = ConnectorType::New();
  originalConnector->SetInput(reader->GetOutput());
  vtkSmartPointer<vtkImageActor> originalActor =
    vtkSmartPointer<vtkImageActor>::New();
  originalActor->SetInput(originalConnector->GetOutput());
  typedef itk::ImageToVTKImageFilter<UnsignedCharImageType> ConnectorType;
  ConnectorType::Pointer gradientMagnitudeConnector = ConnectorType::New();
  gradientMagnitudeConnector->SetInput(rescaler->GetOutput());
  vtkSmartPointer<vtkImageActor> gradientMagnitudeActor =
    vtkSmartPointer<vtkImageActor>::New();
  gradientMagnitudeActor->SetInput(gradientMagnitudeConnector->GetOutput());
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
  // Setup both renderers
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600,300);
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  leftRenderer->AddActor(originalActor);
  rightRenderer->AddActor(gradientMagnitudeActor);
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
  renderWindowInteractor->SetInteractorStyle(style);
  renderWindowInteractor->SetRenderWindow(renderWindow);
  renderWindowInteractor->Initialize();


   renderWindowInteractor->Start();
   QuickView viewer;
  viewer.AddImage<UnsignedCharImageType>(reader->GetOutput());
  viewer.AddImage<FloatImageType>(gradientFilter->GetOutput());
  viewer.Visualize();


   return EXIT_SUCCESS;
   return EXIT_SUCCESS;

Revision as of 01:22, 12 December 2010

This example demonstrates how to compute the magnitude of the gradient of an image. The original image and its gradient magnitude are displayed on the screen.

GradientMagnitudeRecursiveGaussianImageFilter.cxx

<source lang="cpp">

  1. include "itkImage.h"
  2. include "itkImageFileReader.h"
  3. include "itkImageFileWriter.h"
  4. include "itkGradientMagnitudeRecursiveGaussianImageFilter.h"
  1. include "QuickView.h"

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

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

 // Parse command line arguments
 std::string inputFilename = argv[1];

 // Setup types
 typedef itk::Image< float,  2 >        FloatImageType;
 typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;

 typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;

 typedef itk::GradientMagnitudeRecursiveGaussianImageFilter<

UnsignedCharImageType, FloatImageType > filterType; 

 // Create and setup a reader
 readerType::Pointer reader = readerType::New();
 reader->SetFileName( inputFilename.c_str() );

 // Create and setup a gradient filter
 filterType::Pointer gradientFilter = filterType::New();
 gradientFilter->SetInput( reader->GetOutput() );

 QuickView viewer;
 viewer.AddImage<UnsignedCharImageType>(reader->GetOutput());
 viewer.AddImage<FloatImageType>(gradientFilter->GetOutput());
 viewer.Visualize();

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

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

PROJECT(GradientMagnitudeRecursiveGaussianImageFilter)

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(GradientMagnitudeRecursiveGaussianImageFilter GradientMagnitudeRecursiveGaussianImageFilter.cxx) TARGET_LINK_LIBRARIES(GradientMagnitudeRecursiveGaussianImageFilter vtkHybrid ITKBasicFilters ITKIO ITKCommon)

</source>

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