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| ==GradientImageFilter.cxx==
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkCovariantVector.h"
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| #include "itkImageFileReader.h"
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| #include "itkImageFileWriter.h"
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| #include "itkGradientImageFilter.h"
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| | |
| #include <itkImageToVTKImageFilter.h>
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| | |
| #include "vtkPointData.h"
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| #include "vtkFloatArray.h"
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| #include "vtkImageData.h"
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| #include "vtkRenderWindowInteractor.h"
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| #include "vtkRenderWindow.h"
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| #include "vtkSmartPointer.h"
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| #include "vtkImageActor.h"
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| #include "vtkActor.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
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| #include "vtkGlyph3DMapper.h"
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| #include "vtkArrowSource.h"
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| | |
| void VectorImageToVTKImage(itk::Image<itk::CovariantVector<float, 2>, 2>::Pointer vectorImage, vtkImageData* VTKImage);
| |
| | |
| int main(int argc, char * argv[])
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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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| | |
| // Create and setup a reader
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| typedef itk::ImageFileReader< UnsignedCharImageType > ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName( inputFilename.c_str() );
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|
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| // Create and setup a gradient filter
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| typedef itk::GradientImageFilter<
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| UnsignedCharImageType, float> GradientFilterType;
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| GradientFilterType::Pointer gradientFilter = GradientFilterType::New();
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| gradientFilter->SetInput( reader->GetOutput() );
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| gradientFilter->Update();
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| | |
| // Visualize original image
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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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| | |
| // Visualize gradient
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| vtkSmartPointer<vtkImageData> gradientImage =
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| vtkSmartPointer<vtkImageData>::New();
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| VectorImageToVTKImage(gradientFilter->GetOutput(), gradientImage);
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|
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| vtkSmartPointer<vtkArrowSource> arrowSource =
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| vtkSmartPointer<vtkArrowSource>::New();
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|
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| vtkSmartPointer<vtkGlyph3DMapper> gradientMapper =
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| vtkSmartPointer<vtkGlyph3DMapper>::New();
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| gradientMapper->ScalingOn();
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| gradientMapper->SetScaleFactor(.05);
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| gradientMapper->SetSourceConnection(arrowSource->GetOutputPort());
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| gradientMapper->SetInputConnection(gradientImage->GetProducerPort());
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| gradientMapper->Update();
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| | |
| vtkSmartPointer<vtkActor> gradientActor =
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| vtkSmartPointer<vtkActor>::New();
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| gradientActor->SetMapper(gradientMapper);
| |
| | |
| // Visualize
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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}; | |
| | |
| // 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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| rightRenderer->SetBackground(1,0,0);
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| | |
| leftRenderer->AddActor(originalActor);
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| rightRenderer->AddActor(gradientActor);
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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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| }
| |
| | |
| void VectorImageToVTKImage(itk::Image<itk::CovariantVector<float, 2>, 2>::Pointer vectorImage, vtkImageData* VTKImage)
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| {
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| itk::Image<itk::CovariantVector<float, 2>, 2>::RegionType region = vectorImage->GetLargestPossibleRegion();
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| itk::Image<itk::CovariantVector<float, 2>, 2>::SizeType imageSize = region.GetSize();
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| VTKImage->SetExtent(0, imageSize[0] -1, 0, imageSize[1] - 1, 0, 0);
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| | |
| vtkSmartPointer<vtkFloatArray> vectors =
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| vtkSmartPointer<vtkFloatArray>::New();
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| vectors->SetNumberOfComponents(3);
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| vectors->SetNumberOfTuples(imageSize[0] * imageSize[1]);
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| vectors->SetName("GradientVectors");
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| | |
| int counter = 0;
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| for(unsigned int j = 0; j < imageSize[1]; j++)
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| {
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| for(unsigned int i = 0; i < imageSize[0]; i++)
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| {
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| itk::Image<itk::CovariantVector<float, 2>, 2>::IndexType index;
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| index[0] = i;
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| index[1] = j;
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| | |
| itk::Image<itk::CovariantVector<float, 2>, 2>::PixelType pixel = vectorImage->GetPixel(index);
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|
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| float v[2];
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| v[0] = pixel[0];
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| v[1] = pixel[1];
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| v[2] = 0;
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| vectors->InsertTupleValue(counter, v);
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| counter++;
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| }
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| }
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| //std::cout << region << std::endl;
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|
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| VTKImage->GetPointData()->SetVectors(vectors);
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| }
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| </source>
| |
| | |
| ==CMakeLists.txt==
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| <source lang="cmake">
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| cmake_minimum_required(VERSION 2.6)
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| PROJECT(GradientImageFilter)
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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(GradientImageFilter GradientImageFilter.cxx)
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| TARGET_LINK_LIBRARIES(GradientImageFilter
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| vtkHybrid
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| ITKBasicFilters ITKIO ITKCommon)
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| | |
| </source>
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