Difference between revisions of "ITK/Examples/EdgesAndGradients/GradientMagnitudeImageFilter"

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(Created page with "==GradientMagnitudeImageFilter.cxx== <source lang="cpp"> #include <string> #include "itkImage.h" #include "itkImageFileReader.h" #include "itkImageFileWriter.h" #include "itkRes...")
 
(added visualization)
Line 1: Line 1:
==GradientMagnitudeImageFilter.cxx==
==GradientMagnitudeImageFilter.cxx==
<source lang="cpp">
<source lang="cpp">
#include <string>
#include "itkImage.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileReader.h"
Line 8: Line 6:
#include "itkRescaleIntensityImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkGradientMagnitudeImageFilter.h"
#include "itkGradientMagnitudeImageFilter.h"
#include <itkImageToVTKImageFilter.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[])
{
{
   // Verify command line arguments
   // Verify command line arguments
   if( argc < 3 )
   if( argc < 2 )
     {
     {
  std::cerr << "Usage: " << std::endl;
  std::cerr << "Usage: " << std::endl;
  std::cerr << argv[0] << " inputImageFile outputImageFile " << std::endl;
  std::cerr << argv[0] << "inputImageFile" << std::endl;
  return EXIT_FAILURE;
  return EXIT_FAILURE;
     }
     }
Line 21: Line 28:
   // Parse command line arguments
   // Parse command line arguments
   std::string inputFilename = argv[1];
   std::string inputFilename = argv[1];
  std::string outputFilename = argv[2];


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


  typedef itk::Image< inputPixelType,  2 >  inputImageType;
   typedef itk::ImageFileReader< UnsignedCharImageType >  readerType;
  typedef itk::Image< outputPixelType, 2 >  outputImageType;
 
   typedef itk::ImageFileReader< inputImageType >  readerType;


   typedef itk::GradientMagnitudeImageFilter<
   typedef itk::GradientMagnitudeImageFilter<
  inputImageType, outputImageType >  filterType;
  UnsignedCharImageType, FloatImageType >  filterType;


   // Create and setup a reader
   // Create and setup a reader
Line 46: Line 49:
   // To write the gradient image file, we must rescale the gradient values
   // To write the gradient image file, we must rescale the gradient values
   // to a reasonable range
   // to a reasonable range
  typedef unsigned char writePixelType;
  typedef itk::Image< writePixelType, 2 > writeImageType;
   typedef itk::RescaleIntensityImageFilter<
   typedef itk::RescaleIntensityImageFilter<
  outputImageType, writeImageType > rescaleFilterType;
  FloatImageType, UnsignedCharImageType > rescaleFilterType;


   rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
   rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
   rescaler->SetOutputMinimum(   0 );
   rescaler->SetOutputMinimum(0);
   rescaler->SetOutputMaximum( 255 );
   rescaler->SetOutputMaximum(255);
   rescaler->SetInput( gradientFilter->GetOutput() );
   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();


   // Create and setup a writer
   renderWindowInteractor->Start();
  typedef itk::ImageFileWriter< writeImageType >  writerType;
  writerType::Pointer writer = writerType::New();
  writer->SetFileName( outputFilename.c_str() );
  writer->SetInput( rescaler->GetOutput() );
  writer->Update();


   return 0;
   return EXIT_SUCCESS;
}
}
</source>
</source>

Revision as of 14:56, 22 October 2010

GradientMagnitudeImageFilter.cxx

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkRescaleIntensityImageFilter.h"
#include "itkGradientMagnitudeImageFilter.h"

#include <itkImageToVTKImageFilter.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[])
{
  // 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::GradientMagnitudeImageFilter<
		  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() );
  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();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)

PROJECT(GradientMagnitudeImageFilter)

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

ADD_EXECUTABLE(GradientMagnitudeImageFilter GradientMagnitudeImageFilter.cxx)
TARGET_LINK_LIBRARIES(Gradient ITKNumerics ITKIO ITKAlgorithms)