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

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(Use QuickView)
Line 7: Line 7:
#include "itkGradientMagnitudeImageFilter.h"
#include "itkGradientMagnitudeImageFilter.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[])
Line 30: Line 23:


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


Line 47: Line 39:
   gradientFilter->Update();
   gradientFilter->Update();


   // To write the gradient image file, we must rescale the gradient values
   QuickView viewer;
  // to a reasonable range
   viewer.AddImage<UnsignedCharImageType>(reader->GetOutput());
  typedef itk::RescaleIntensityImageFilter<
   viewer.AddImage<FloatImageType>(gradientFilter->GetOutput());
  FloatImageType, UnsignedCharImageType > rescaleFilterType;
   viewer.Visualize();
 
   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;
   return EXIT_SUCCESS;

Revision as of 00:33, 18 November 2010

GradientMagnitudeImageFilter.cxx

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

#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< unsigned char,  2 >  UnsignedCharImageType;
  typedef itk::Image< float,  2 >   FloatImageType;
  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();

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

  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 
vtkHybrid
ITKBasicFilters ITKIO ITKCommon)