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| 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.
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}} |
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| ==RecursiveGaussianImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkImageFileWriter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkRecursiveGaussianImageFilter.h"
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| #include <itkImageToVTKImageFilter.h>
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| #include "vtkImageViewer.h"
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| #include "vtkRenderWindowInteractor.h"
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| #include "vtkSmartPointer.h"
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| #include "vtkImageActor.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
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| int main(int argc, char * argv[])
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| {
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| // Verify command line arguments
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| if( argc < 2 )
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| {
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| std::cerr << "Usage: " << std::endl;
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| std::cerr << argv[0] << "inputImageFile" << std::endl;
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| return EXIT_FAILURE;
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| }
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| // Parse command line arguments
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| std::string inputFilename = argv[1];
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| // Setup types
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| typedef itk::Image< float, 2 > FloatImageType;
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| typedef itk::Image< unsigned char, 2 > UnsignedCharImageType;
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| typedef itk::ImageFileReader< UnsignedCharImageType > readerType;
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| typedef itk::RecursiveGaussianImageFilter<
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| UnsignedCharImageType, FloatImageType > filterType;
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| // Create and setup a reader
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| readerType::Pointer reader = readerType::New();
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| reader->SetFileName( inputFilename.c_str() );
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| // Create and setup a derivative filter
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| filterType::Pointer derivativeFilter = filterType::New();
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| derivativeFilter->SetInput( reader->GetOutput() );
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| derivativeFilter->SetDirection(0); // "x" axis
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| derivativeFilter->SetSecondOrder();
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| derivativeFilter->Update();
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| // To visualize the derivative, we must rescale the values
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| // to a reasonable range
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| typedef itk::RescaleIntensityImageFilter<
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| FloatImageType, UnsignedCharImageType > rescaleFilterType;
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| rescaleFilterType::Pointer rescaler = rescaleFilterType::New();
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| rescaler->SetOutputMinimum(0);
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| rescaler->SetOutputMaximum(255);
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| rescaler->SetInput( derivativeFilter->GetOutput() );
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| rescaler->Update();
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| typedef itk::ImageToVTKImageFilter<UnsignedCharImageType> ConnectorType;
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| ConnectorType::Pointer originalConnector = ConnectorType::New();
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| originalConnector->SetInput(reader->GetOutput());
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| vtkSmartPointer<vtkImageActor> originalActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| originalActor->SetInput(originalConnector->GetOutput());
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| typedef itk::ImageToVTKImageFilter<UnsignedCharImageType> ConnectorType;
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| ConnectorType::Pointer derivativeConnector = ConnectorType::New();
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| derivativeConnector->SetInput(rescaler->GetOutput());
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| vtkSmartPointer<vtkImageActor> derivativeActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| derivativeActor->SetInput(derivativeConnector->GetOutput());
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| // Define viewport ranges
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| // (xmin, ymin, xmax, ymax)
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| double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
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| double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; | |
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| // Setup both renderers
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| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
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| renderWindow->SetSize(600,300);
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| vtkSmartPointer<vtkRenderer> leftRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(leftRenderer);
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| leftRenderer->SetViewport(leftViewport);
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| vtkSmartPointer<vtkRenderer> rightRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(rightRenderer);
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| rightRenderer->SetViewport(rightViewport);
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| leftRenderer->AddActor(originalActor);
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| rightRenderer->AddActor(derivativeActor);
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| vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
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| vtkSmartPointer<vtkRenderWindowInteractor>::New();
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| vtkSmartPointer<vtkInteractorStyleImage> style =
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| vtkSmartPointer<vtkInteractorStyleImage>::New();
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| renderWindowInteractor->SetInteractorStyle(style);
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| renderWindowInteractor->SetRenderWindow(renderWindow);
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| renderWindowInteractor->Initialize();
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| renderWindowInteractor->Start();
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| return EXIT_SUCCESS;
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| }
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| </source>
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| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(RecursiveGaussianImageFilter)
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| include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)
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| FIND_PACKAGE(VTK REQUIRED)
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| INCLUDE(${VTK_USE_FILE})
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| FIND_PACKAGE(ITK REQUIRED)
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| INCLUDE(${ITK_USE_FILE})
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| ADD_EXECUTABLE(RecursiveGaussianImageFilter RecursiveGaussianImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(RecursiveGaussianImageFilter
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| vtkHybrid
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| ITKBasicFilters ITKIO ITKCommon)
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| </source>
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