ITK/Examples/EdgesAndGradients/RecursiveGaussianImageFilter: Difference between revisions

From KitwarePublic
< ITK‎ | Examples
Jump to navigationJump to search
mNo edit summary
(Use QuickView.)
Line 9: Line 9:
#include "itkRecursiveGaussianImageFilter.h"
#include "itkRecursiveGaussianImageFilter.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 44: Line 37:
   reader->SetFileName( inputFilename.c_str() );
   reader->SetFileName( inputFilename.c_str() );


   // Create and setup a derivative filter
   // Create and setup a gaussian filter
   filterType::Pointer derivativeFilter = filterType::New();
   filterType::Pointer gaussianFilter = filterType::New();
   derivativeFilter->SetInput( reader->GetOutput() );
   gaussianFilter->SetInput( reader->GetOutput() );
   derivativeFilter->SetDirection(0); // "x" axis
   gaussianFilter->SetDirection(0); // "x" axis
   derivativeFilter->SetSecondOrder();
   gaussianFilter->SetSecondOrder();
  derivativeFilter->Update();
 
  // To visualize the derivative, we must rescale the values
  // to a reasonable range
  typedef itk::RescaleIntensityImageFilter<
  FloatImageType, UnsignedCharImageType > rescaleFilterType;
 
  rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
  rescaler->SetOutputMinimum(0);
  rescaler->SetOutputMaximum(255);
  rescaler->SetInput( derivativeFilter->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 derivativeConnector = ConnectorType::New();
  derivativeConnector->SetInput(rescaler->GetOutput());
 
  vtkSmartPointer<vtkImageActor> derivativeActor =
    vtkSmartPointer<vtkImageActor>::New();
  derivativeActor->SetInput(derivativeConnector->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(derivativeActor);
 
  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>(gaussianFilter->GetOutput());
  viewer.Visualize();


   return EXIT_SUCCESS;
   return EXIT_SUCCESS;

Revision as of 21:44, 10 December 2010

This example demonstrates how to compute the derivative of an image in a specified axis-aligned direction. The original image and its x gradient are displayed on the screen.

RecursiveGaussianImageFilter.cxx

<source lang="cpp">

  1. include "itkImage.h"
  2. include "itkImageFileReader.h"
  3. include "itkImageFileWriter.h"
  4. include "itkRescaleIntensityImageFilter.h"
  5. include "itkRecursiveGaussianImageFilter.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::RecursiveGaussianImageFilter<

UnsignedCharImageType, FloatImageType > filterType; 

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

 // Create and setup a gaussian filter
 filterType::Pointer gaussianFilter = filterType::New();
 gaussianFilter->SetInput( reader->GetOutput() );
 gaussianFilter->SetDirection(0); // "x" axis
 gaussianFilter->SetSecondOrder();

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

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

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

PROJECT(RecursiveGaussianImageFilter)

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

</source>

Retrieved from "https://public.kitware.com/Wiki/index.php?title=ITK/Examples/EdgesAndGradients/RecursiveGaussianImageFilter&oldid=35392"